1. Chapter 5 Section 1: What is Energy?

2. Energy

3. Energy is the ability to do work

4. Work is done when a force makes an object move or change its direction.

5. Example
When you kick a soccer ball, you are doing work on the ball and then the ball does work on the goal.

6. When one object does work on another, energy is transferred.

7. Energy is expressed in the units Joules (J)

8. Kinetic Energy

9. Kinetic energy is the energy of motion

10. Kinetic energy is the energy of motion

11. All moving objects have kinetic energy.

12. Kinetic energy depends on mass and speed
Kinetic energy= mv2/2
M=mass
V2=velocity2

13. To increase kinetic energy, increase the mass(m) or speed(v) of the object.

14. Potential Energy

15. Potential energy is the energy an object has because of its position

16. There is more potential energy in a car on top of a hill than a car on a flat street.

17. Gravitational potential energy is a transfer of energy to an object by lifting it in the air.

18. Holding a ball over your head vs it resting on the ground.
Example
Holding a ball over your head vs it resting on the ground.

19. To calculate gravitational potential energy:
weight x height

20. Weight is the amount of force needed to lift an object and height is a distance

21. Mechanical Energy

22. Mechanical Energy is the total energy of motion and position of an object

23. potential energy+kinetic energy
Mechanical energy=
potential energy+kinetic energy

24. Other forms of energy Thermal Energy Chemical Energy Electrical Energy
Sound Energy
Light Energy
Nuclear Energy