Question

How does the proper inflation of tyre save fuel?

• A. Normal reaction decreases.
• B. Normal reaction increases.
• C. Sliding contact with the road decreases.
• D. Sliding contact with the road increases.

Answer 1

The correct option is C Sliding contact with the road decreases.

When the tyre is properly inflated, its contact area with the road decreases which reduces the sliding contact. However, as the friction does not depend on area so the frictional force and thus the normal reaction remains unchanged.

Hence, correct answer is option $C$