You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been
larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must
have been equal.

Question

Quizplus · Accepted Answer

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, the force the rope exerts on the crate is always equal in magnitude and opposite in direction to the force the crate exerts on the rope, regardless of whether the crate moves or not. The movement of the crate depends on the net force acting on it, which includes other forces such as friction and gravity, not just the force between the crate and the rope.

You Pull on a Crate with a Rope