1. Energy

2. Energy Energy is the ability to do work Comes in many forms
Measured in joules (J)
Objects can gain energy when work is being done to them
Kicking a football
Lifting an object

3. Forms of Energy Mechanical – The energy associated with motion
Walking or riding a bike
Water in a waterfall
A car or a plane

4. Forms of Energy Electromagnetic – moving electric charges Electricity
Light

5. Forms of Energy Nuclear – energy from the nucleus of an atom
Nucleus is split - Fission
Nuclei join - Fusion

6. Forms of Energy Chemical – Breaking or making chemical bonds
Burning rocket fuel
Digesting food
Playing a sport

7. Forms of Energy Heat – The internal motion of atoms
The faster particles move, the more heat energy is produced
Rubbing hands together – the friction converts mechanical energy to heat
Phase changes – like melting

8. Energy Does a ball have energy? Does it have energy when it falls?
Can energy be created in the ball?
The ball had energy before it was dropped – potential energy
The ball had energy as it was dropped – kinetic energy

9. Kinetic Energy

10. Potential Energy
Potential Energy – the energy of position – stored energy
Stretched rubber band
The string on a bow before an archer shoots an arrow
An object before it is dropped
Undigested food

11. Potential Energy

12. Conservation of Energy
The law of conservation of energy states that energy can be neither created nor destroyed
Does this sound familiar?
One form of energy can be converted into another - Newtons_Cradle_-_Incredible_Science.avi
Why is this important?

13. Conservation of Energy
Because we like roller coasters!
In order for a roller coaster to work, energy must be conserved

14. Conservation of Energy

15. Ticket Out the Door
At which point is kinetic energy the highest?

16. Ticket Out the Door
At which point is potential energy the highest?

17. Conservation of Energy
Design a Roller Coaster