A 3-m-long heavy chain, mass of 30 kg, is held by one end from a barn loft by a farmer. The farmer then lets go of the chain. What is the tension in the chain at its midpoint (1.5 m from an end) as it is falling?
A) 0 N
B) 200 N
C) 150 N
D) 100 N

Question

Quizplus · Accepted Answer

When the chain is in free fall, all parts of it are accelerating downwards at the same acceleration due to gravity, with no part of the chain exerting a force on any other part. Therefore, the tension at any point in the chain, including its midpoint, is 0 N.

A 3-M-Long Heavy Chain, Mass of 30 Kg, Is Held