1. Energy

2. Resources
Science Voyages, Level Blue, Glencoe/McGraw-Hill, 2000
Science Interactions, Course 1, Glencoe, 1993
Motion, Forces, and Energy, Prentice Hall, 1993
If instructed to do so, please complete the worksheet for this presentation
Click to move to the next page and click to go to the previous page.

3. This is your vocabulary-
energy
potential energy
kinetic energy
gravity
force
joule
conservation of energy

4. These are the formulas-
potential energy = (force of gravity)(height)
kinetic energy = ½ (mass)(velocity)2

5. The word energy comes from a Greek word that means “work in”.
What is energy?
The word energy comes from a Greek word that means “work in”.
Since there is no work without motion, you can think of work as a transfer of energy.
So, energy can be defined as the ability to do work or cause change.
Now that’s a moving thought!

6. Energy comes in many forms-
chemical
mechanical
thermal
…and more
electrical
radiant
atomic

7. Energy is measured in joules (J)-
(Sounds like “jewel”---looks like “joule”!)
Click here to learn more.
This SI unit was named in honor of James Prescott Joule, a physicist who studied “work” in the middle 1800’s. Because of the direct connection between work and energy, energy is measured in the unit as work.
One joule (J) is the amount of work you do when you exert the force required to accelerate 1 kilogram of mass at 1 meter per second per second to move an object a distance of 1 meter.

8. James Joule discovered the law of conservation of energy
James Joule discovered the law of conservation of energy. This law states that energy cannot be created or destroyed, but is only transformed from one form to another.

9. There are two general kinds of energy---kinetic and potential.
Whether energy is kinetic or potential depends on whether it is being transferred or stored.

10. Kinetic Energy Kinetic energy is the energy of motion.
The word kinetic comes from the Greek word kinetos, which means “moving.”
The kinetic energy of an object depends on both its mass and its velocity. As an object’s mass increases, so does its kinetic energy.

11. The formula for kinetic energy is-
kinetic energy = ½ (mass)(velocity)2
KE = ½ mv2
How much kinetic energy does an object have if its mass is 5.0 kg and it is moving at a speed of 4.0 m/s?
KE = (1/2)(5.0 kg)(4.0 m/s)2 = 40 J
Click

13. http://www. odec. ca/projects/2008/burr8b2/Free%20Fall_files/image007

14. Potential Energy
Potential energy is the energy of position or condition. It is stored energy.

15. What is the gravitational potential energy of an object on the ground?
Gravitational potential energy is the energy of position. This is the formula-
GPE = mass x gravitational acceleration x height
GPE = mgh
The mass is m, the height it can fall is h and the g represents acceleration due to gravity, 9.8 m/s2.
What is the gravitational potential energy of an object on the ground?
This answer is 0.
Click 

16. As the roller coaster car goes up and down, its energy changes from kinetic to potential and back again many times. Kinetic energy is greatest when the car is going at its greatest speed. The car has the most potential energy when it is at its highest point.

17. It's time to move on to your next activity-
You've been energized.
It's time to move on to your next activity-