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Page 1

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Summary of work, energy and power
Work done, W = force, F x displacement in the direction of the
force, s
If the force acts at an angle to the displacement : W = F cos x
s


Energy is the ability to do work . Work and energy are…

Page 2

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Power is the rate of doing work.
The two types of mechanical energy are kinetic energy (Ek= ½
mv2) and potential energy (Ep=mgh). Energy is always
conserved, though it is not always transferred in useful forms.




If kinetic energy is conserved in a collision, the collision is
elastic.
In inelastic…

Page 3

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Momentum is always conserved, if no resultant external force
is acting.

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