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Q. 14

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 176

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Short Answer

Blocks A and B in the figure are connected by a massless string over a massless, frictionless pulley. The blocks have just been released from rest. Will the pulley rotate clockwise, counterclockwise, or not at all? Explain.

The pulley would not rotate at all.

See the step by step solution

Step by Step Solution

Step 1 : Given information

Blocks A and B in the figure are connected by a massless string over a massless, frictionless pulley.

Step 2 : Calculation

Here, the mass of both the block is so there will be an equal force on both the sides of the pulley and to rotate the pulley, there must be a torque applied on the pulley.

The net torque on the pulley is given as:-

Here r is the radius of the pulley and F1 and F2 are two forces acting on either side of pulley .

Thus, there will be no torque on the pulley and the pulley would not rotate at all.

Step 3 : Final answer

There will be no torque on the pulley and it wouldn't rotate at all.

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