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Lecture

# Energy conservation.docx

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Langara College

Physics

PHYS 1114

R.Wong

Winter

Description

Energy Conservation
Work Energy Theorem
When friction is present,there is a work energy theorem
the formula for a work energy theorem:
W – f *l = delta K + delta U
ext
where W is the work done by an external force
ext
2
where delta K is the change in Kinetic Energy (K = ½ mv )
where delta P is the change in Potential Energy (U=mgy)
Thermal Energy
When the work energy theorem is 0 during the object displacements, we can use the
Thermal Energy formula:
delta E = f*l

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