Assertion (A): It is easier to pull a lawn roller than to push it. Reason (R): Pushing increases the apparent weight of the roller, thereby increasing the frictional force.
A. A is true but R is false.
B. Both A and R are true and R is the correct explanation of A.
C. A is false but R is true.
D. Both A and R are true but R is NOT the correct explanation of A.
Answer: Option B
Solution (By JKSSB Mock Tests)
When you pull a roller at an upward angle, the vertical component of the applied force acts strictly upwards, reducing the normal reaction (N = mg - Fsin_theta) and thus reducing friction (muN). When you push it at a downward angle, the vertical component adds to the weight (N = mg + Fsin_theta), increasing the normal reaction and consequently increasing the rolling friction.
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