The grade 10 presentation on mechanical energy

1. 1
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22. Mechanical energy
Physics: Mechanics
Grade 10

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Potential energy
Potential energy is the energy an object has due to its position or state.
The gravitational potential energy of an object is the energy the object has because of its
position in the gravitational field relative to some reference point.
EP=mgh

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Kinetic energy
The kinetic energy of an object is the energy the object has due to its motion.
EK =
1
2
mv2

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Mechanical energy
The mechanical energy of an object is the sum of the potential energy and kinetic energy of
the object.
EM=EK +EP
EM=mgh+
1
2
mv2

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Conservation of energy
The Law of Conservation of Energy states that energy cannot be created or destroyed, but can
only be changed from one form into another.
The Law of Conservation of Mechanical Energy states that the total mechanical energy of an
isolated system (i.e. no friction or air resistance) remains constant.

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