Q. Frictional force acts in

A
the same direction as the motion
B
the opposite direction of the motion
C
all the directions
D
upward direction
Solution:

To stop a moving object, a force must act in the opposite direction to the direction of motion. For instance, if you push your book across your desk, the book will move. The force of the push moves the book. As the book slides across the desk, it slows down and stops moving. The force that opposes the motion of an object is called friction.

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