Physics Energy. Law of Conservation of Energy energy cannot be created or destroyed only transferred from one form to another Electric LightChemical.

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