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NOTES ON KINETIC ENERGY AND
WORK-ENERGY THEOREM
2
1
2
Km
v
=
Kinetic Energy
net
f
i
wK
KK
=−
=
∆
Work-Energy Theorem
a) Kinetic energy is energy associated with the motion of a particle.
b) The SI unit of KE is the joule (J).
c) The Work-Energy Theorem is valid even when the net force is not constant!
d) The Work-Energy Theorem is valid only for particle-like objects.
e)
If work is done on a system and the
only
change in the system is in its speed,
the work done by the net force equals the change in KE of the system!

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