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if work done by a conservative force is ...

if work done by a conservative force is positive the select the correct option(s).
(a) potential energy will decrease.
(b) potential energy may increase or decrease.
(c )kinetic energy will increase.
(d) kinetic energy may increase or decrease.

Text Solution

Verified by Experts

The correct Answer is:
A, D
`DeltaU =-W`
so, if work done by conservative force is positive then `DeltaU` is negative or potential energy will decrease. But there is no straight forward rule regarding the kinetic energy.
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Knowledge Check

  • Asseration : If work by done conservative forces is positive, kinetic energy will increase. Reason : Because potential energy will decrease.

    A
    If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
    B
    If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
    C
    If Assertion is true, but the Reason is false
    D
    If Assertion is false but the Reason is true.

  • If momentum is increased by 20%, then kinetic energy increases by

    A
    0.48
    B
    0.44
    C
    0.4
    D
    36%.

  • The potential energy of a system increases if work is done

    A
    upon the system by a nonconservative force
    B
    by the system against a conservative force
    C
    by the system against a nonconservative force
    D
    upon the system by a conservative force

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