A string is attached to the rear-view mirror of a car.A ball is hanging at the other end of the string.The car is driving around in a circle,at a constant speed.Which of the following lists gives all of the forces directly acting on the ball?
A) tension and gravity
B) tension
C) tension, gravity, and the centripetal force
D) tension, gravity, the centripetal force, and friction

Question

Quizplus · Accepted Answer

The only forces acting on the ball are tension (from the string) and gravity. The centripetal force is not a separate force, but rather the net force that is required to keep the ball moving in a circular path. Friction is likely present, but it is not directly acting on the ball itself.

A String Is Attached to the Rear-View Mirror of a Car.A