Question

In the figure shown, the disc $D$ does not slip on the horizontal surface $S$. The pulley $P$, disc $D$, block $B$ are not massless and the string (massless) does not slip over the pulley. The string is wound around the disc. Then:

• A. The acceleration of the block $B$ is double the acceleration of the centre of $D$
• B. The force of friction exerted by $D$ on $S$ acts to the left
• C. The horizontal and the vertical sections of the string have the same tension
• D. The sum of the kinetic energies of $D$ and $B$ is less than the loss in the potential energy of $B$ as it moves down

Answer 1

Answer: (A), (B), (D)

The correct options are
A The acceleration of the block $B$ is double the acceleration of the centre of $D$
B The force of friction exerted by $D$ on $S$ acts to the left
D The sum of the kinetic energies of $D$ and $B$ is less than the loss in the potential energy of $B$ as it moves down