When a hammer strikes a nail that is partially penetrating a board, we know that the nail exerts a force back on the hammer because...?
A. The nail moves farther into the board.
B. A sound is made by the hammer striking the nail.
C. The hammer's motion changes.
D. The hammer is heavier than the nail.
- Andrew SmithLv 74 weeks agoFavourite answer
C the motion of the hammer changes.
"Every body will move in a straight line with constant speed unless it is acted upon by a force" The hammer does NOT move in a straight line with constant speed, ergo it was subjected to a force.