Rear End (automobile)
Rear end may refer to: * Buttocks, euphemistically * Rear-end collision, a type of road collision *An automobile's rear differential, colloquially *''Rear End'', a 1999 album by Mercedes See also *Rear (other) Rear may refer to: Animals *Rear (horse), when a horse lifts its front legs off the ground *In stockbreeding, to breed and raise Humans *Parenting (child rearing), the process of promoting and supporting a child from infancy to adulthood *Gende ...

Buttocks
The buttocks (singular: buttock) are two rounded portions of the exterior anatomy of most mammals, located on the posterior of the pelvic region. In humans, the buttocks are located between the lower back and the perineum. They are composed of a layer of exterior skin and underlying subcutaneous fat superimposed on a left and right gluteus maximus and gluteus medius muscles. The two gluteus maximus muscles are the largest muscles in the human body. They are responsible for movements such as straightening the body into the upright (standing) posture when it is bent at the waist; maintaining the body in the upright posture by keeping the hip joints extended; and propelling the body forward via further leg (hip) extension when walking or running. In the seated position, the buttocks bear the weight of the upper body and take that weight off the feet. In many cultures, the buttocks play a role in sexual attraction. Many cultures have also used the buttocks as a primary target f ...
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Rear-end Collision
A rear-end collision (often called simply rear-end or in the UK a shunt) occurs when a vehicle crashes into the one in front of it. Common factors contributing to rear-end collisions include driver inattention or distraction, tailgating, panic stops, and reduced traction due to wet weather or worn pavement. Rear-end rail collisions occur when a train runs into the end of a preceding train. According to the National Highway Safety Administration (NHTSA), rear-end collisions account for only 6% of fatal automobile crashes. However, they account for 28% of all automobile accidents, making them one of the most frequent types of automobile accidents in the United States. Overview Typical scenarios for rear-ends are a sudden deceleration by the first car (for example, to avoid someone crossing the street) so that the driver behind it does not have time to brake and collides with it. Alternatively, the following car may accelerate more rapidly than the leading one (for example, lea ...
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Differential (mechanical Device)
A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others, or a fixed multiple of that average. Functional description The following description of a differential applies to a traditional rear-wheel-drive car or truck with an open or limited slip differential combined with a reduction gearset using bevel gears (these are not strictly necessary; see spur-gear differential): Thus, for example, if the car is making a turn to the right, the main ring gear may make 10 full rotations. During that time, the left wheel will make more rotations because it has farther to travel, and the right wheel will make fewer rotations as it has less distance to travel. The sun gears (which drive the axle half-shafts) will rotate at different speeds relative to the ring gear (one faster, one slower) by, say, 2 full turns each (4 full turns relative to each other), resulting in the left wheel mak ...
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Rear End
Rear end may refer to: *Buttocks, euphemistically *Rear-end collision, a type of road collision *An automobile's rear differential, colloquially *''Rear End Rear end may refer to: *Buttocks, euphemistically *Rear-end collision A rear-end collision (often called simply rear-end or in the UK a shunt) occurs when a vehicle crashes into the one in front of it. Common factors contributing to rear-end ...'', a 1999 album by Mercedes See also * Rear (other) {{Disambiguation ...
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