Simple machines, such as pulleys, levers, and gears, are never 100 percent efficient. This means that the energy you put into them is always greater than the useful energy you get out of them. Why is this

answer; how far out of place which the object finished relative to the starting location;

it was given as a lesson and guide for prayer.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it