1. Energy Two types of energy: Kinetic Energy Potential Energy
The ability of a system to do work.
Two types of energy:
Kinetic Energy
Potential Energy

2. Energy Transfer
Energy TRANSFER is the passing of energy from one object to another object.
Example: A cup of hot coffee has
thermal energy. Some of this
thermal energy is transferred to the
particles in cold milk, in which
you put to make the coffee cooler.

3. Energy Transformation-- when energy is changed from one form to another
An objects energy can be:
As velocity kinetic energy and potential energy
As velocity kinetic energy and potential energy
1. All Kinetic Energy
2. All Potential Energy
3. A combination of both
increases
increases
decreases
decreases
decreases
increases
INVERSE
WHAT IS THE TYPE OF RELATIONSHIP KE AND PE HAVE?

4. Roller Coasters
As you move up to the first hill on a roller coaster the distance
between the coaster and the Earth increases, resulting in an increase
of Gravitational Potential Energy.
At the top of the first hill you have the most Gravitational Potential
Energy
As you begin your trip down the hill you increase your speed
resulting in a transformation from GPE to KE.
At the bottom of the hill right before it goes back upward the
GPE is small, but the KE is Large.
As it starts to move up the next hill or loop KE is transformed
back into GPE

5. As a basketball player throws the ball into the air, various energy conversions take place.

7. AC Calculating Ke and Pe

8. Kinetic Energy – what does it depend on?
The an object moves, the it has.
The greater the of a moving object, the it has.
Kinetic energy depends on both
faster
more kinetic energy
mass
more kinetic energy
mass and velocity.
K.E. = 1/2 m v2.

9. Calculating Potential Energy
OR you could multiply weight (in Newton’s) by height
Pe= H x W

10. 1. You serve a volleyball with a mass of 2. 1 kg
1. You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has ___________ energy. Calculate it.
Kinetic Energy K.E. = 1/2 m v2. ½ of 2.1kg x (30m/s) x 900 =945joules

11. 2. A baby carriage is sitting at the top of a hill that is 21 m high
2. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage has ____________ energy. Calculate it.
Potential Energy
Pe= HxW
Pe 21m x 12N= 252 Joules