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Assertion: If net force on a system is z...

Assertion: If net force on a system is zero, then momentum of every individual body remains constant.
Reason: If momentum of a system is constant, then kinetic energy of the system may change.

A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

B

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
Two bodies are released from rest in space. Net force on the system is zero. Momentum of system is constant. But momentum of individual body is not constant. Further, kinetic energy of system is also increasing.
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Knowledge Check

  • In net force on a system is zero then

    A
    its momentum is conserved
    B
    Its kinetic energy may increase
    C
    The acceleration of it’s a constitutent particle may be non - zero
    D
    All of these

  • The angular momentum of a moving body remains constant if

    A
    net external force is applied
    B
    net external torque is applied
    C
    net pressure is applied
    D
    net external torque is not applied .

  • Change in kinetic energy of the system is equal to

    A
    Work done by all the forces ( internal and external )
    B
    Work done by external forces .
    C
    Work done by internal conservative forces .
    D
    None of these

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    The internal energy of a system remains constant when it undergoes

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