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Standard XII

Physics

Momentum

A force F i...

Question

A force $F$ is applied to a dumbbell for a time interval $t$ , first as in case (i) and then as in case (ii). In which case does the dumbbell acquire the greater centre of mass speed?

(i)

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(ii)

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Both cases have same COM speed

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the answer depends on the rotational inertia of the dumbbell

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Solution

The correct option is A Both cases have same COM speed
The motion of the COM is determined by the force acting on the system .
Since the applied force $F$ is same in both cases, there will not be any difference in the motion of the COM.

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A force F is applied to a dumbbell for a time interval t, first as in case (i) and then as in case (ii). In which case does the dumbbell acquire the greater centre of mass speed?

The correct option is A Both cases have same COM speedThe motion of the COM is determined by the force acting on the system .Since the applied force F is same in both cases, there will not be any difference in the motion of the COM.

A force $F$ is applied to a dumbbell for a time interval $t$ , first as in case (i) and then as in case (ii). In which case does the dumbbell acquire the greater centre of mass speed?

The correct option is A Both cases have same COM speed
The motion of the COM is determined by the force acting on the system .
Since the applied force $F$ is same in both cases, there will not be any difference in the motion of the COM.