1. Physical Science
Ch. 15: Energy

2. What is Energy?
Energy is the ability of an object to do work. The SI unit for measuring energy is the Joule (J).
1J is the amount of energy required to move a 1N weight, 1 meter.
Energy is transferred by a force moving an object through a distance.

3. Kinetic Energy Kinetic energy is energy of motion.
The amount of kinetic energy depends on the objects mass and velocity.
i.e. the bigger it is or the faster it is moving, the more kinetic energy it has.

4. Video Clip

5. Kinetic Energy Calculations
KE = 1 mv2 KE is measured in 2 Joules (J) A 0.10 kg bird is flying at a constant speed of 8.0 m/s. What is the bird’s kinetic energy?

6. Potential energy is stored energy
Potential energy is stored energy. It is the result of an objects position or condition.
Examples: -a ball sitting on the top shelf
-anything that is flammable
-a skydiver ready to jump

7. Gravitational Potential energy depends upon an object’s mass, height, and acceleration due to gravity
Examples
GPE = mgh
m = mass
g = acceleration due
to gravity 9.8m/s2
on Earth
h = height

8. Gravitational Potential Energy
A diver on a 10.0m high dive platform has a mass of 52.4 kg. Calculate her gravitational potential energy relative to the ground.