Frictional Force and Motion – Rankers Physics

Friction: Practice Problem & Solution

Assertion (A): Due to frictional force acting on a body, the body is always retarded by friction. Reason (R): Friction force opposes the motion of object.  
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) (A) is false but (R) is true

Solution Explained:

To solve this problem, we apply the core principles of Friction. Understanding the underlying formula is key to arriving at the correct answer below:

Friction can cause motion (e.g., walking, car acceleration), so (A) is false. Friction opposes *relative* motion, not necessarily the overall motion of the object. Hence, (R) is also false.

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