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Acceleration
Gravity gravita grave.gif

Unless the state of motion of an object is known, it is impossible to distinguish whether an observed force is due to gravi

As speeds approach that of light, the acceleration produced by a given force decreases, becoming infinitesimally small as light speed is approached; an object with mass can approach this speed asymptotically, but never reach it.

Unless the state of motion of an object is known, it is impossible to distinguish whether an observed force is due to gravity or to acceleration—gravity and inertial acceleration have identical effects. Albert Einstein called this the equivalence principle, and said that only observers who feel no force at all—including the force of gravity—are justified in concluding that they are not accelerating.[10]

Conversions

Conversions between common units of acceleration
Base val