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5.work,energy,power and collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
The potential energy of a system increases if work is done
  • ✓
    by the system against a conservative force. 
  • B
    Upon the system by a conservative force. 
  • C
    Upon the system by a nonconservative force.
  • D
    by the system against a nonconservative force
✓

Answer

Correct option: A.
by the system against a conservative force. 
a
Relation between conservative force and potential energy is,

$F _{\text {cons }}=- dU / dx$

$F _{\text {cons }} \cdot dx =- dU$

$- W =-\int F _{\text {cons }} \cdot dx =\Delta U$

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