A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s² by means of a rope.The force of the block on the rope is: A)14 N, up B)14 N, down C)35 N, up D)35 N, down E)49 N, up

Question

Quizplus · Accepted Answer

The force of the block on the rope is equal in magnitude, but opposite in direction, to the force of the rope on the block. The force can be found using Newton's second law, F = ma, where F is the force, m is the mass, and a is the acceleration. Thus, F = (5 kg)(2.8 m/s^2) = 14 N, but since the force is in the opposite direction of the acceleration, the answer is 14 N downward, which corresponds to choice D.

A 5-Kg Concrete Block Is Lowered with a Downward Acceleration