Home Physics System of Particles Rotational Motion Kinetic Energy, Work and Power A solid sphere starts from rest at the top o…
Physics System of Particles Rotational Motion Kinetic Energy, Work and Power MCQ (Single Correct)

A solid sphere starts from rest at the top of an incline of height h and length l , and moves down. The force of friction between the sphere and the incline is F. This is insufficient to prevent slipping. The kinetic energy of the sphere at the bottom of the incline is W.

A
The work done against the force of friction is F l .
B
The heat produced is F l .
C
W = mgh-F l .
D
W > (mgh - F l ).

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(a, d)

In rolling with slipping, the force of friction produces a torque which gives an angular acceleration to the body. Hence, part of the work done against friction is converted to rotational kinetic energy, which adds to the total kinetic energy. Only the remaining part of the work done against friction is converted to heat.

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