question_answer

A motor cycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motor cycle is ascending on the overbridge, the normal force on it

A)  increases

B)  decreases

C)  remains the same

D)  fluctuates erratically

Correct Answer: A

Solution :

 Reaction of normal force on the motor cyclist \[Mg\cos \theta -N\frac{m{{v}^{2}}}{R}\] or \[N=Mg\cos \theta -\frac{M{{v}^{2}}}{R}\] As the motor cyclist moves upward on the bridge, \[\theta \] decreases and therefore, N increases and becomes maximum at the highest point.