Question

suppose you rub two surfaces together or strike a piece of metal with a hammer. either of these examples is a/an ____ source of heat energy. answer input: spelling counts but capitalization doesn’t.

Explanation:

When two surfaces are rubbed together or a metal is struck with a hammer, work is done, and this work is converted into heat energy. This process is known as producing heat through mechanical means, specifically friction (in the case of rubbing surfaces) or impact (in the case of striking metal), which falls under the category of a mechanical source of heat energy.

Answer:

mechanical