Why is output force always bigger than input force?

Answer 1

Output force is never greater than input force. There are losses associated with any system, and we have not found a way to get more out of a "thing" or "machine" or any other system than we put in.

With a lever, you can have a small input force, and on the other end, you can have a larger output force - or you can do it the other way. Quite often, however, the whole idea of such a lever is to be able to apply more force than we can manage with our weak muscles. But when you use a lever in the conventional way, you have to apply a force through a considerable distance to get the "concentrated" force at the other end.

Answer 2

The output force can be larger than the input force in a mechanical system due to the principles of work and energy. This is achieved through mechanical advantage, where the system is designed in a way that allows a smaller input force to produce a larger output force. Mechanical advantage is often achieved through the use of levers, pulleys, gears, or other mechanisms that amplify force.