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Question

If the total momentum of a system is changing, then


A

The particles of system must exert force on each other

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B

The system must be under the influence of gravity

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C

A net external force must act on the system

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D

None of the above

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Solution

The correct option is C

A net external force must act on the system


Concept of momentum

  1. By Newton’s second law: “ the net external force is equal to the rate of change of momentum”
  2. If the total momentum of a system changes, there is some net external force acting on the system.

Therefore a net external force must act on the system

Hence, option (c) is correct


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