1. Energy comes in many forms: mechanical, electrical , magnetic, solar,
the ability (capacity) to do work
Energy comes in many forms:
mechanical, electrical , magnetic, solar,
thermal, chemical, etc...
The SI unit of energy is the Joule.
Energy, like work, is a scalar.

2. KE = 1/2 mv2 Kinetic Energy energy of motion
All moving objects that
have mass have kinetic energy.
KE = 1/2 mv2
m - mass of the object in kg
v - speed of the object in m/s
KE - the kinetic energy in J

3. Work-Energy Theorem the net work done on an object is
equal to its change in kinetic energy

4. an object to change its KE because
A net force causes
an object to change its KE because
a net force causes an object to accelerate,
and acceleration means a change in velocity,
and if velocity changes, KE changes.

5. PEg = mgh Potential Energy energy of position or condition
gravitational potential energy
PEg = mgh
m - mass of object in kg
g - acceleration of gravity in m/s2
h - height of object, in m,
from some arbitrary reference point
PE – gravitational potential energy in J

6. Law of Conservation of Energy
“Energy can neither be created nor destroyed.
It may only change forms.”
S all types of energy before the event
= S all types of energy after the event
Examples:
A dropped object loses gravitational PE as it gains KE.
A block slides across the floor and comes to a stop.
A compressed spring shoots a ball into the air.