A lead block is suspended from your hand by a string.The reaction to the force of gravity on the block is the force exerted by the:
A)string on the block
B)block on the string
C)string on the hand
D)hand on the string
E)block on the Earth

Question

Quizplus · Accepted Answer

The reaction to the force of gravity on the block (the Earth pulling on the block) is the force exerted by the block on the Earth. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Thus, the block exerts a force on the Earth equal in magnitude and opposite in direction to the force that the Earth exerts on it.

A Lead Block Is Suspended from Your Hand by a String.The