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Q.

A yo-yo is resting on a perfectly rough horizontal table. Forces  F1 , F2 and F3 are applied separately as shown. The correct statement is:

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a

when F3 is applied, the centre of mass will move to the right.

b

 when  F1 is applied, the centre of mass will move to the right.

c

when  F2  is applied the centre of mass will move to the left.

d

when F2 is applied the centre of mass will move to the right.

answer is C.

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Detailed Solution

Applying  F1 Horizontally creates Toque  r1F1 around yo-yo, the Point of Contact between the yo-yo and the floor, this Torque is in the opposite direction.

So, yo-yo rolls clock wise in left direction.

Friction force works in the left direction, so yo-yo moves in right direction.

finally F1 is applying in rightward. 

So, the center of mass of yo-yo will move to right.

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