CBSEJEEClass 11
What is the work-energy theorem?
Answer
The work-energy theorem states that the net work done on a body equals the change in its kinetic energy, W = ΔKE = ½mv² − ½mu².
The working
Statement
The total work done by all forces acting on a body is equal to the change in the kinetic energy of that body.
Formula
W(net) = KE(final) − KE(initial) = ½mv² − ½mu², where u and v are the initial and final speeds.
Interpretation
Positive net work increases the body's speed, while negative net work (like friction) decreases it.
Usefulness
It lets us find speed or work without dealing with time or acceleration directly, which is handy when forces vary.
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