Berney123
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For example if I punch an object and it doesn't move, am I giving it energy, if so after doing that billions of times wouldn't it gain mass because e=mc2.
You are not. The Earth (or whatever prevents the object from moving) pushes against the object in the opposite direction, and the energy gained by the object is 0. If you take deformations into account, you could heat it a tiny bit, but that is not related to the motion of the whole object.For example if I punch an object and it doesn't move, am I giving it energy
Depends I guess. If you are hammering iron to make a sword you transfer quite a lot of energy into unmovable object.Berney123 said:For example if I punch an object and it doesn't move, am I giving it energy, if so after doing that billions of times wouldn't it gain mass because e=mc2.