Question

If the net force acting on a rigid body is zero, it implies that ___

• A. the centre of mass is moving at a constant velocity
• B. the body can't have angular acceleration
• C. the body must have linear acceleration
• D. the body must have linear and angular acceleration

Answer 1

The correct option is A the centre of mass is moving at a constant velocity

If the net force is zero, it surely implies that centre of mass will not accelerate. As discussed in the videos, the net torque may not be zero in such a case. Thus, the body can have angular acceleration.