Rotation 3 Question 4

10. A ball moves over a fixed track as shown in the figure. From A to B the ball rolls without slipping. If surface BC is frictionless and KA,KB and KC are kinetic energies of the ball at A,B and C respectively, then

(2006,5 M)

(a) hA>hC;KB>KC

(b) hA>hC;KC>KA

(c) hA=hC;KB=KC

(d) hA<hC;KB>KC

Show Answer

Answer:

Correct Answer: 10. (d)

Solution:

  1. On smooth part BC, due to zero torque, angular velocity and hence the rotational kinetic energy remains constant. While moving from B to C translational kinetic energy converts into gravitational potential energy. So, hA<hc and kB>kC.


NCERT Chapter Video Solution

Dual Pane