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PhysicsEnergy
Law of Conservation of Energy• energy cannot be created or destroyed
only transferred from one form to another
Electric Light Chemical Mechanical
2 forms of mechanical energy
1. Kinetic energy (KE)
-energy due to motion
KE = ½ mv2
(J) (kg)(m/s)2
m is the mass of the object in kg
v is the velocity in m/s
2. Potential energy (PE)-energy due to position or conditionex: book high on a shelf
stretched rubber band wound up clock
Known as gravitational potential energyPE = m g h(J) (kg)(m/s2)(m)
m is the mass of the object in kgg is the acceleration due to gravity 9.81m/s2
h is the height in m
Check up:
• Where does the pendulum have greatest PE?
• Where does the pendulum have greatest KE?
Greatest PE
Greatest PE
Greatest KE