More than any other principle, timing defines the weight of an object. Two objects, identical in size and shape, can appear to be two vastly different weights by manipulating timing alone. The heavier an object is, the greater its mass, and the more force is required to change its motion. A heavy body
is slower to accelerate and decelerate than a light one. It takes a large force to get a cannonball moving, but once moving, it tends to keep moving at the same speed and requires some force to stop it. When dealing with heavy objects, one must allow plenty of time and force to start, stop or change
their movements, in order to make their weight look convincing.