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Uniform, or constant, acceleration is a type of motion in which the velocity of an object changes equal amounts in equal time periods. An example of an object having uniform acceleration would be a ball rolling down a frictionless ramp. The object picks up velocity as it goes down the ramp with equal changes in time. The most frequently cited example of uniform acceleration however is that of an object in free fall. Here it can be seen that the acceleration of a falling body in the absence of resitances to motion (friction etc.) is dependent only on the gravitational field strength ''g'' (also called acceleration due to gravity), since by Newton's Second Law the force, acting on a body is given by: