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A trampoline is a device consisting of a piece of taut, strong
fabric Textile is an umbrella term that includes various fiber-based materials, including fibers, yarns, filaments, threads, different fabric types, etc. At first, the word "textiles" only referred to woven fabrics. However, weaving is not the ...
stretched between a
steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
frame using many coiled springs. Not all trampolines have springs, as the
Springfree Trampoline Springfree Trampoline is a company that manufactures recreational trampoline products and accessories. The design was created by Dr. Keith Vivian Alexander, an associate professor in the Mechanical Engineering Department at the University of Cant ...
uses glass-reinforced plastic rods. People bounce on trampolines for
recreational Recreation is an activity of leisure, leisure being discretionary time. The "need to do something for recreation" is an essential element of human biology and psychology. Recreational activities are often done for enjoyment, amusement, or pleasure ...
and competitive purposes. The fabric that users bounce on (commonly known as the "bounce mat" or "trampoline bed") is not elastic itself; the elasticity is provided by the springs that connect it to the frame, which store
potential energy In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors. Common types of potential energy include the gravitational potentia ...
.


History


Early trampoline-like devices

A game similar to trampolining was developed by the
Inuit Inuit (; iu, ᐃᓄᐃᑦ 'the people', singular: Inuk, , dual: Inuuk, ) are a group of culturally similar indigenous peoples inhabiting the Arctic and subarctic regions of Greenland, Labrador, Quebec, Nunavut, the Northwest Territories ...
, who would toss blanket dancers into the air on a walrus skin one at a time (see
Nalukataq Nalukataq (, ''naluk-'' 'to throw it underhand; to toss it up' + ''kataq'') is the spring whaling festival of the Iñupiat of Northern Alaska, especially the North Slope Borough. It is characterized by its namesake, the dramatic Eskimo blanket t ...
) during a spring celebration of whale harvest. There is also some evidence of people in
Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...
having been tossed into the air by a number of people holding a blanket. Mak in the Wakefield Mystery Play ''
The Second Shepherds' Play ''The Second Shepherds' Play'' (also known as ''The Second Shepherds' Pageant'') is a famous medieval mystery play which is contained in the manuscript HM1, the unique manuscript of the Wakefield Cycle. These plays are also referred to as the Tow ...
'', and
Sancho Panza Sancho Panza () is a fictional character in the novel ''Don Quixote'' written by Spanish author Don Miguel de Cervantes Saavedra in 1605. Sancho acts as squire to Don Quixote and provides comments throughout the novel, known as ''sanchismos'', ...
in ''
Don Quixote is a Spanish epic novel by Miguel de Cervantes. Originally published in two parts, in 1605 and 1615, its full title is ''The Ingenious Gentleman Don Quixote of La Mancha'' or, in Spanish, (changing in Part 2 to ). A founding work of Wester ...
'', are both subjected to blanketing – however, these are clearly non-voluntary, non-recreational instances of quasi-judicial, mob-administered punishment. The trampoline-like
life net A life net, also known as a Browder Life Safety Net or jumping sheet, is a type of rescue equipment formerly used by firefighters. When used in the proper conditions, it allowed people on upper floors of burning buildings an opportunity to jum ...
s once used by firefighters to catch people jumping out of burning buildings were invented in 1887. The 19th-century poster for
Pablo Fanque Pablo Fanque (born William Darby; 30 March 1810 – 4 May 1871) was a British equestrian performer and circus proprietor, becoming the first recorded Black circus owner in Britain. His circus was popular in Victorian Britain for 30 years, a p ...
's Circus Royal refers to performance on trampoline. The device is thought to have been more like a springboard than the fabric-and-coiled-springs apparatus presently in use. These may not be the true antecedents of the modern sport of trampolining, but indicate that the concept of bouncing off a fabric surface has been around for some time. In the early years of the 20th century, some acrobats used a "bouncing bed" on the stage to amuse audiences. The bouncing bed was a form of small trampoline covered by bedclothes, on which acrobats performed mostly
comedy Comedy is a genre of fiction that consists of discourses or works intended to be humorous or amusing by inducing laughter, especially in theatre, film, stand-up comedy, television, radio, books, or any other entertainment medium. The term o ...
routines. According to
circus A circus is a company of performers who put on diverse entertainment shows that may include clowns, acrobats, trained animals, trapeze acts, musicians, dancers, hoopers, tightrope walkers, jugglers, magicians, ventriloquists, and unicyclist ...
folklore, the trampoline was supposedly first developed by an artiste named du Trampolin, who saw the possibility of using the trapeze safety net as a form of propulsion and landing device and experimented with different systems of suspension, eventually reducing the net to a practical size for separate performance. While trampoline-like devices were used for shows and in the circus, the story of du Trampolin is almost certainly apocryphal. No documentary evidence has been found to support it.
William Daly Paley William C. Paley (1857 – 31 May 1924) was an early cameraman and film pioneer. He worked with X-Rays before health issues led him to switch to film projects. He built a film projector called the Kalatechnoscope. He was hired as a cameraman at E ...
of
Thomas A. Edison, Inc. Thomas A. Edison, Incorporated (originally the National Phonograph Company) was the main holding company for the various manufacturing companies established by the inventor and entrepreneur Thomas Edison. It was a successor to Edison Manufacturin ...
filmed blanket tossing initiation of a new recruit in Company F, 1st Ohio Volunteers in 1898.


First modern trampolines

The first modern trampoline was built by George Nissen and
Larry Griswold Laurens "Larry" V. Griswold (September 17, 1905August 24, 1996), known as ''"The Diving Fool"'', was an American gymnast and entertainer who was involved in the early development of the trampoline. Griswold was a college level gymnast and tumbler ...
in 1936. Nissen was a
gymnastics Gymnastics is a type of sport that includes physical exercises requiring balance, strength, flexibility, agility, coordination, dedication and endurance. The movements involved in gymnastics contribute to the development of the arms, legs, shou ...
and
diving Diving most often refers to: * Diving (sport), the sport of jumping into deep water * Underwater diving, human activity underwater for recreational or occupational purposes Diving or Dive may also refer to: Sports * Dive (American football), a ...
competitor and Griswold was a tumbler on the gymnastics team, both at the
University of Iowa The University of Iowa (UI, U of I, UIowa, or simply Iowa) is a public university, public research university in Iowa City, Iowa, United States. Founded in 1847, it is the oldest and largest university in the state. The University of Iowa is org ...
, United States. They had observed
trapeze A trapeze is a short horizontal bar hung by ropes or metal straps from a ceiling support. It is an aerial apparatus commonly found in circus performances. Trapeze acts may be static, spinning (rigged from a single point), swinging or flying, an ...
artists using a tight net to add entertainment value to their performance and experimented by stretching a piece of canvas, in which they had inserted grommets along each side, to an angle iron frame by means of coiled springs. It was initially used to train tumblers but soon became popular in its own right. Nissen explained that the name came from the
Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...
''trampolín'', meaning a diving board. Nissen had heard the word on a demonstration tour in
Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
in the late 1930s and decided to use an anglicized form as the trademark for the apparatus. In 1942, Griswold and Nissen created the Griswold-Nissen Trampoline & Tumbling Company, and began making trampolines commercially in
Cedar Rapids, Iowa Cedar Rapids () is the second-largest city in Iowa, United States and is the county seat of Linn County, Iowa, Linn County. The city lies on both banks of the Cedar River (Iowa River), Cedar River, north of Iowa City, Iowa, Iowa City and north ...
. The generic term for the trademarked trampoline was a ''rebound tumbler'' and the sport began as ''rebound tumbling''. It has since lost its trademark and has become a
generic trademark A generic trademark, also known as a genericized trademark or proprietary eponym, is a trademark or brand name that, because of its popularity or significance, has become the generic term for, or synonymous with, a general class of products or ...
. Early in their development Nissen anticipated trampolines being used in a number of recreational areas, including those involving more than one participant on the same trampoline. One such game was Spaceballa game of two teams of two on a single trampoline with specially constructed end "walls" and a middle "wall" through which a ball could be propelled to hit a target on the other side's end wall.


Use in flight and astronaut training

During
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
, the United States Navy Flight School developed the use of the trampoline in its training of pilots and navigators, giving them concentrated practice in spatial orientation that had not been possible before. After the war, the development of the
space flight Spaceflight (or space flight) is an application of astronautics to fly spacecraft into or through outer space, either human spaceflight, with or uncrewed spaceflight, without humans on board. Most spaceflight is uncrewed and conducted mainly w ...
programme again brought the trampoline into use to help train both American and Soviet
astronaut An astronaut (from the Ancient Greek (), meaning 'star', and (), meaning 'sailor') is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a spacecraft. Although generally r ...
s, giving them experience of variable body positions in flight.


Competitive sports

The first Trampoline World Championships were organised by
Ted Blake Terence Michael Blake (19 October 1921 – 6 March 1998) was an early British trampoline pioneer. Following the development of modern trampolines in the USA by George Nissen, Ted Blake was a major contributor to their nascence in the United ...
of Nissen, and held in London in 1964. The first World Champions were both American,
Dan Millman Daniel Jay Millman (born February 22, 1946) is an American author and lecturer in the personal development field. He is best-known for the movie Peaceful Warrior, which is based on his own life and taken from one of his books. Early life Millman ...
and Judy Wills Cline. Cline went on to dominate and become the most highly decorated trampoline champion of all time. One of the earliest pioneers of trampoline as a competitive sport was Jeff Hennessy, a coach at the
University of Louisiana at Lafayette The University of Louisiana at Lafayette (UL Lafayette, University of Louisiana, ULL, or UL) is a public research university in Lafayette, Louisiana. It has the largest enrollment within the nine-campus University of Louisiana System and the s ...
. Hennessy also coached the United States trampoline team, producing more world champions than any other person. Among his world champions was his daughter,
Leigh Hennessy Leigh Hennessy also known as Leigh Hennessy Robson, is a stunt woman, author, and trampoline gymnast. She was a two-time double mini-trampoline world champion, (1976, 1978) and won a silver medal in synchronized trampoline at the World Trampoline ...
. Both Jeff and Leigh Hennessy are in the
USA Gymnastics United States of America Gymnastics (USA Gymnastics or USAG) is the national governing body for gymnastics in the United States. Established in 1963 as the U.S. Gymnastics Federation (USGF), USA Gymnastics is responsible for selecting and traini ...
Hall of Fame. The competitive gymnastic sport of
trampolining Trampolining or trampoline gymnastics is a competitive Olympic sport in which athletes perform acrobatics while bouncing on a trampoline. In competition, these can include simple jumps in the straight, pike, tuck, or straddle position to more com ...
has been part of the
Olympic Games The modern Olympic Games or Olympics (french: link=no, Jeux olympiques) are the leading international sporting events featuring summer and winter sports competitions in which thousands of athletes from around the world participate in a var ...
since 2000. On a modern competitive trampoline, a skilled athlete can bounce to a height of up to , performing multiple
somersault A somersault (also ''flip'', ''heli'', and in gymnastics ''salto'') is an acrobatic exercise in which a person's body rotates 360° around a horizontal axis with the feet passing over the head. A somersault can be performed forwards, backwards ...
s and twists. Trampolines also feature in the competitive sport of
Slamball Slamball is a form of basketball played with four trampolines in front of each net and boards around the court edge. The name SlamBall is the trademark of SlamBall, LLC. While SlamBall is based on basketball, it is a contact sport, with blocks ...
, a variant of
basketball Basketball is a team sport in which two teams, most commonly of five players each, opposing one another on a rectangular Basketball court, court, compete with the primary objective of #Shooting, shooting a basketball (ball), basketball (appr ...
, and
Bossaball is a team sport that originated in Brazil and was conceptualised by Belgian Filip Eyckmans in 2005. Bossaball is a ball game between two teams, combining elements of volleyball, football, and gymnastics with music into a sport. It is play ...
, a variant of
volleyball Volleyball is a team sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules. It has been a part of the official program of the Summ ...
.


Cross-training for other sports

There are a number of other sports that use trampolines to help develop and hone
acrobatic Acrobatics () is the performance of human feats of balance (ability), balance, agility, and motor coordination. Acrobatic skills are used in performing arts, sports, sporting events, and martial arts. Extensive use of acrobatic skills are most ...
skills in training before they are used in the actual sporting venue. Examples can be found in
diving Diving most often refers to: * Diving (sport), the sport of jumping into deep water * Underwater diving, human activity underwater for recreational or occupational purposes Diving or Dive may also refer to: Sports * Dive (American football), a ...
,
gymnastics Gymnastics is a type of sport that includes physical exercises requiring balance, strength, flexibility, agility, coordination, dedication and endurance. The movements involved in gymnastics contribute to the development of the arms, legs, shou ...
, and
freestyle skiing Freestyle skiing is a skiing discipline comprising aerials, Mogul Skiing, moguls, Ski Cross, cross, Half-pipe skiing, half-pipe, slopestyle and big air as part of the Freestyle skiing at the Winter Olympics, Winter Olympics. It can consist of a ...
. One main advantage of trampolining as a training tool for other acrobatic sports is that it allows repetitive drill practice for acrobatic experience every two seconds or less, compared with many minutes with sports that involve hills, ramps or high platforms. In some situations, it can also be safer compared to landings on the ground.


Types of trampolines

The frame of a competitive trampoline is made of steel and can be made to fold up for transportation to competition venues. The trampoline bed is rectangular in size fitted into the frame with around 110 steel springs (the actual number may vary by manufacturer). The bed is made of a strong fabric, although this is not itself elastic; the elasticity is provided only by the springs. The fabric can be woven from webbing, which is the most commonly used material. However, in the 2007 World Championships held in
Quebec City Quebec City ( or ; french: Ville de Québec), officially Québec (), is the capital city of the Provinces and territories of Canada, Canadian province of Quebec. As of July 2021, the city had a population of 549,459, and the Communauté métrop ...
, a
Ross Ross or ROSS may refer to: People * Clan Ross, a Highland Scottish clan * Ross (name), including a list of people with the surname or given name Ross, as well as the meaning * Earl of Ross, a peerage of Scotland Places * RoSS, the Republic of Sou ...
bed (or two-string bed), woven from individual thin strings, was used. This type of bed gives a little extra height to the rebound. Recreational trampolines for home use are less sturdily constructed than competitive ones and their springs are weaker. They may be of various shapes, though most are circular, octagonal or rectangular. The fabric is usually a waterproof
canvas Canvas is an extremely durable plain-woven fabric used for making sails, tents, marquees, backpacks, shelters, as a support for oil painting and for other items for which sturdiness is required, as well as in such fashion objects as handbags ...
or woven
polypropylene Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and ...
material. As with competitive trampolines, recreational trampolines are usually made using coiled steel springs to provide the rebounding force, but spring-free trampolines also exist.


Commercial trampoline parks

In 1959 and 1960, it became very popular to have outdoor commercial "jump centres" or "trampoline parks" in many places in North America where people could enjoy recreational trampolining. However, these tended to have a high accident rate, and the public's interest rapidly waned. In the early 21st century, indoor commercial trampoline parks have made a comeback, with a number of franchises operating across the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
and
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
. ABC News has reported that in 2014 there were at least 345 trampoline parks operating in the United States. Similar parks have more recently been opened in other countries. The International Association of Trampoline Parks (IATP) estimated that park numbers had grown from 35-40 parks in 2011 to around 280 in 2014. The following year, IATP estimated that 345 parks were open by the end of 2014, and that another 115 would open by the end of 2015 in North America. IATP also estimated that at the end of 2014 there were 40 parks outside of North America, and that by the end of 2015 there would be at least 100 indoor trampoline parks open internationally. As of March 2019, CircusTrix (and its subsidiary Sky Zone) is the largest operator of trampoline parks in the U.S. and in the world, with 319 parks operating under their brands. These commercial parks are located indoors, and have wall-to wall-trampolines to prevent people falling off the trampolines on to hard surfaces. Padded or spring walls protect people from impact injuries. Despite these precautions, there has been at least one death recorded due to a head-first landing at a trampoline park. In March 2012,
New York Yankees The New York Yankees are an American professional baseball team based in the Boroughs of New York City, New York City borough of the Bronx. The Yankees compete in Major League Baseball (MLB) as a member club of the American League (AL) Amer ...
pitcher
Joba Chamberlain Justin Louis "Joba" Chamberlain (''né'' Heath; ; born September 23, 1985) is an American former professional baseball pitcher. He played in Major League Baseball (MLB) for the New York Yankees, Detroit Tigers, Kansas City Royals, and Cleveland ...
seriously injured his ankle while jumping at a commercial jump centre in
Tampa Tampa () is a city on the Gulf Coast of the U.S. state of Florida. The city's borders include the north shore of Tampa Bay and the east shore of Old Tampa Bay. Tampa is the largest city in the Tampa Bay area and the seat of Hillsborough County ...
with his son. In 2018, a man died in a British Columbia trampoline park, which prompted calls for more safety regulations for these popular activities.


Wall running

Wall running is a sport where the participant uses a wall and platforms placed next to the trampoline bed to do tricks. The basic movement is a backdrop on the trampoline and then the feet touching the wall at the top of the bounce. From there, there is no limit to the acrobatic movements that are possible, similar to regular trampolining. The advantage is that twists and turns can be initiated more forcefully from a solid wall and that the vertical speed can be transferred to rotation in addition to forces from the legs or arms. Additionally, energy can be gained both from the bed at the bottom of the bounce, and from the wall at the top of the bounce.


Safety

Using a trampoline can be dangerous. Organized clubs and gyms usually have large safety end-decks with foam pads at each end, and spotters are placed alongside the trampoline to try to break the fall of any athlete who loses control and falls. In 1999, the U.S. Consumer Product Safety Commission estimated there were 100,000 hospital emergency room visits for trampoline injuries. Due to the much larger numbers involved and lesser safety standards, the majority of injuries occur on privately owned home trampolines or in commercial trampoline facilities rather than organized gyms.
CBC Television CBC Television (also known as CBC TV) is a Canadian English-language broadcast television network owned by the Canadian Broadcasting Corporation, the national public broadcaster. The network began operations on September 6, 1952. Its French-l ...
's ''
Marketplace A marketplace or market place is a location where people regularly gather for the purchase and sale of provisions, livestock, and other goods. In different parts of the world, a marketplace may be described as a '' souk'' (from the Arabic), ' ...
'' discovered that the trampoline park industry is unregulated in Canada, with different standards for padding and foam pit depth, self-inspections and repairs, and not being required to report injuries. It was also noted that there were generally too few staff to enforce rules, and that promotional advertisements often showed participants engaging in somersaults even though this was extremely dangerous without proper training. All trampoline parks rely upon liability waivers, where the signee assumes the risk of the activity including when injuries result from the establishment's own negligence or poorly maintained equipment, rather than beefing up safety standards and supervision. Bouncing off a trampoline can result in a fall of from the peak of a bounce to the ground or a fall into the suspension springs and frame. There has been an increase in the number of home trampolines in recent years and a corresponding increase in the number of injuries reported. Some medical organizations have suggested that the devices be banned from home use. Authorities recommend that only one person should be allowed to jump at a time to avoid collisions and people being catapulted in an unexpected direction or higher than they expect. One of the most common sources of injury is when multiple users are bouncing on the trampoline at one time. Often, this situation leads to users bouncing into one another and thus becoming injured; many suffer broken bones as a result of landing badly after knocking into another user. Another of the most common sources of serious injury is an attempt to perform
somersault A somersault (also ''flip'', ''heli'', and in gymnastics ''salto'') is an acrobatic exercise in which a person's body rotates 360° around a horizontal axis with the feet passing over the head. A somersault can be performed forwards, backwards ...
s without proper training. In some cases, people land on their neck or head, which can cause paralysis or even death. In an infamous incident in the 1960s, pole-vaulting champion
Brian Sternberg Brian Sternberg (June 21, 1943 – May 23, 2013) was a world record holder in the men's pole vault who was paralyzed from the neck down after a trampoline accident in 1963. Sternberg set one of his world records on May 25, 1963, in Modesto, Ca ...
became paralyzed from the neck down in a trampoline accident. Danger can be reduced by burying the trampoline so the bed is closer to the surrounding surface to lessen falling distance, and padding that surrounding area. Pads over the spring and frame reduce the severity of impact injuries. Keeping the springs covered also reduces the risk of a limb falling between the gaps in the springs and the rest of the body falling off the trampoline. Kits are available for home trampolines that provide a retaining net around the trampoline and prevent users from bouncing over the edge. The American Academy of Pediatrics states that there is no epidemiological evidence that these improve safety. The nets do prevent jumpers falling off the trampoline onto the ground, but these falls are not the most common source of injury. Multiple users bouncing in a netted trampoline can still be injured. Safety net enclosures have a larger benefit for safeguarding solo trampolinists, so long as they avoid falling on their head or neck. Having some training in a gym may be beneficial in alerting people to possible hazards and provide techniques to avoid bad falls. Family-oriented commercial areas in North America, such as shopping centres, carnivals, and so on, often include
closed inflatable trampoline Inflatable castles (also called closed inflatable trampolines (CITs), bouncing castles, bouncy houses, bounce houses, jumping castles, jumpers, bouncy castles, moon bounces, or moonwalks) are temporary inflatable structures and buildings and sim ...
s (CITs) as a children's attraction. These have safety nets on the sides to prevent injuries.


Mini-trampolines

A mini-trampoline (also known as a rebounder, trampette, jogging trampoline, or exercise trampoline) is a type of trampoline less than in diameter and about off the ground, often kept indoors and used as part of a
physical fitness Physical fitness is a state of health and well-being and, more specifically, the ability to perform aspects of Outline of sports, sports, occupations and daily activities. Physical fitness is generally achieved through proper nutrition, moderate ...
regime. So-called rebounding provides a form of exercise with a low impact on knees and joints. Mini-trampolines do not give a rebound as high as larger recreational or competitive trampolines. Most department and
big-box store A big-box store (also hyperstore, supercenter, superstore, or megastore) is a physically large retail establishment, usually part of a chain of stores. The term sometimes also refers, by extension, to the company that operates the store. The t ...
s sell mini-trampolines.


Educational use

Trampoline activity has been used by science teachers to illustrate Newton's Three Laws of Motion, as well as the "
elastic collision In physics, an elastic collision is an encounter (collision) between two bodies in which the total kinetic energy of the two bodies remains the same. In an ideal, perfectly elastic collision, there is no net conversion of kinetic energy into o ...
." In co-operation with the
University of Bremen The University of Bremen (German: ''Universität Bremen'') is a public university in Bremen, Germany, with approximately 23,500 people from 115 countries. It is one of 11 institutions which were successful in the category "Institutional Strategi ...
and the German Aerospace Center (DLR), the machtWissen.de Corporation from Bremen, Germany developed the weightlessness demonstrator "Gravity Jumper" based on a trampoline. Due to the acceleration during the jump, an acceleration force takes effect in addition to the usual gravitational force. Both forces add up and the person on the trampoline seems to become heavier. As soon as the jumper leaves the trampoline, he is under a
free fall In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on i ...
condition, which means that the jumper seems weightless and does not feel the acceleration due to gravity. Every person receives a three-axis acceleration sensor, fastened to them with a belt. The sensor transmits the data of the flight path to a monitor; a monitor shows the course of the acceleration, including the weightless phase. The interplay of
acceleration In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the ...
due to the trampoline and weightlessness becomes apparent.


References


External links

* {{Authority control Brands that became generic Trampolining