question_answer

A motorcycle is going on an over bridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the over bridge, the normal force on it

A)  increases                           

B)  decreases

C)  remains the same          

D)  fluctuates

Correct Answer: A

Solution :

Here,   \[R=mg\,\,\cos \theta -\frac{m{{v}^{2}}}{R}\] It is clear from the figure that a decreases with height, so that \[\cos \theta \] increases and as a result of which normal force N increases.