Question

Assertion : It is difficult to move a cycle along the road with its brakes on.

Reason : Sliding friction is greater than rolling friction.

• A. Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.

Answer 1

Answer: (A)

Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.

Answer 2

When the brakes of a cycle are applied, the wheels stop rolling and instead attempt to slide on the road surface. It is observed that moving a cycle with locked wheels (brakes on) is indeed difficult.

Friction is a force that opposes motion. There are different types of friction, including rolling friction (when an object rolls over a surface) and sliding friction (when an object slides over a surface). It is a fundamental principle in physics that sliding friction is always greater than rolling friction for the same normal force.

Since sliding friction is significantly larger than rolling friction, a greater force is required to overcome it. When the cycle's brakes are on, the wheels are forced into a sliding motion rather than a rolling motion. Consequently, the much larger sliding friction comes into play, making it difficult to move the cycle. Therefore, the reason correctly explains why it is difficult to move a cycle with its brakes on.