Question

A ball moves along an uneven horizontal road with fixed speed at all points on the road. The normal reaction of the road on the body at two different points A and B is:

• A. maximum at A
• B. maximum at B
• C. minimum at A
• D. same at A and B

Answer 1

The correct option is A maximum at A

Centripetal acceleration at A and B is $\frac{m{u}^2}{r_A}$ and $\frac{m{u}^2}{r_B}$ respectively. Clearly $r_B>r_A$. therefore centripetal acceleration at A is more. Thus, reaction at B is less than A because here the normal reaction depends on upwards force or acceleration.