A) Rolling frictional force and gravitational force
B) Gravitational force and normal reaction
C) Rolling frictional force and air friction
D) Air friction and normal reaction
Correct Answer: C
Solution :
Friction plays an important role in the motion of an object. When a ball is rolled down an inclined plane, the rolling friction opposes its motion. Also, when an object moves through air, air friction (also called air drag) opposes its motion. The following figure shows the names and directions of forces acting on the rolling ball.You need to login to perform this action.
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