Q. A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in
A)
B)
C)
D)
Explanation
(a) Normal reaction at the highest point
$R = \frac{nv^{2}}{r} - mg$
Reaction is inversely proportional to the radius of the curvature of path and radius is minimum for path depicted in (a)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.