How is energy lost by movement?

Answer 1

Energy is never actually lost, just transfered from one object to another.

The idea that something will lose energy by moving is true, but only because it takes energy to move. If I were to run three miles, I had better be sure that I ate something substantially healthy because if I don't have energy, I may not make it all the way. As I finish running, my energy is released as heat into the biosphere where it will be recycled and used within something else, perhaps taking part in a rainstorm.

One way inanimate objects gain and lose energy is through motion. There is a certain level of potential energy that an object has: This is like stored energy based on an object's surroundings when not in motion. Once in motion, that energy transfers to kinetic energy, based on momentum and friction, and is used until the object is no longer in motion, and thus, becomes potential energy once again.

This example carries with it a great number of possibilities and variables depending on the circumstances, and therefore, can be analyzed in many other ways.