Home  >  Class 11 Physics  >  Class 11 Physics Practice Test: Work, Energy and Power - Work Done by a Variable Force

A spring is stretched by a length x, then the potential energy stored in it changes by 0.5*k*x2, where k is the spring constant.

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Variable force is the force whose direction and amplitude vary during the body's motion and is not constant. Examples are spring force, magnetic force, electrostatic force, etc.


A spring is stretched by a length x, then the potential energy stored in it changes by 0.5*k*x<sup>2</sup>, where k is the spring constant.






 
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