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Assertion: Work done by force of friction in moving a body in any round trip is zero.

Reason: Frictional force is a conservative force.

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Important Questions on Work, Energy and Power

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NEET
IMPORTANT
Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Assertion & Reason)>Q 14
Assertion : A particle moving one dimensionally in conservative field may have more than one turning points.  
Reason : Turning point depends on initial velocity.
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NEET
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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Assertion & Reason)>Q 15
Assertion : For an isolated system, mechanical energy is not conserved. 
Reason : For an isolated system internal energy is constant.
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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Assertion & Reason)>Q 16
Assertion : For an isolated system mechanical energy is conserved. 
Reason : Kinetic frictional force is absent for an isolated system.