Chapter 9, Problem 6Q

Can the sum of the torques on an object be zero while the net force on the object is nonzero? Explain

To determine

Can the sum of the torques on an object be zero while the net force on the object is non-zero?

Answer to Problem 6Q

Solution:

Yes, an example is a rigid bar that falls without rotating.

Explanation of Solution

An object over which the net force is different from zero is one that accelerates in the same direction as the net force. In other words, it is an object that moves with linear acceleration; while an object whose net torque is zero is one that has zero angular acceleration. An example of an object that meets both requirements is a rigid bar that falls without rotating.