Question

A body moves along an uneven surface with constant speed at all points. The normal reaction of the road on the body is:

• A. maximum at A
• B. maximum at B
• C. minimum at C
• D. the same at A, B & C

Answer 1

The correct option is A maximum at A

At A ; $N_A-mg=\frac{m{V}^2}{R_A};$ $N_A=mg+\frac{m{V}^2}{R_A}$

At B ; $N_B=mg-\frac{m{V}^2}{R_B}$ and

At C ; $N_c=mg+\frac{m{V}^2}{R_C}$

$\therefore R_A<R_C$

$\therefore N_A$ is greatest among all.