1. Exploring Energy

2. What is it?
The ability to do work
Work = Force X Distance

3. Work & Energy

4. Energy can be classified as either:
Potential – stored energy
Kinetic – the energy of motion

5. Kinetic Energy 2 The energy of motion
Kinetic energy = Mass X Velocity2 2 Or
KE = ½ mv2

6. How many joules of kinetic energy could he give to a ball?
Rodger Maris swung a bat which had a mass of 2 Kg at a velocity of 45 m/s.
How many joules of kinetic energy could he give to a ball?

7. Real World Application - NASA
and SCIENCE!

8. Potential Energy
Energy that is stored and held in readiness

9. Elastic Potential Energy
Potential energy associated with objects that can be stretched or compressed

10. Gravitational Potential Energy
Potential energy that depends on height
Equal to the work done to lift it
Gravitational potential energy = Weight × Height
Gravitational potential energy = Mass × Gravitational acceleration × Height
GPE = m × g × h or Wt × Ht

11. Potential Energy to Kinetic Energy Transfer

12. Kinetic & Potential Energy

14. Law of Conservation of Energy
The conservation of energy is a fundamental concept of physics.
The amount of energy remains constant and energy is neither created nor destroyed.
Energy can be converted from one form to another (potential energy can be converted to kinetic energy) but the total energy within the domain remains fixed.

15. Seven Forms of Energy

16. 7 -Forms of Energy Mechanical – movement of parts
Sound – movement of sound waves
Chemical – produced by chemical reactions
Electrical – movement of electrons
Radiant – movement of light waves
Thermal – movement of molecules
Nuclear Energy – energy from splitting atoms

18. Mechanical Energy
Movement of parts.

19. Sound Energy
Movement of sound waves.

20. Chemical Energy
Produced through a chemical reaction.

21. Batteries – Stored Potential Energy - Chemical
are all over the place -- in our cars, our PCs, laptops, portable MP3 players and cell phones. A battery is essentially a can full of chemicals that produce electrons.

22. Electrical Energy. Movement of electricity.
occurs naturally (as in lightning)
or is produced (power plant)

23. Radiant Energy LIGHT ENERGY Movement of light waves.
Can be Solar energy: energy from the sun.

24. Thermal Energy
Movement of molecules

25. energy from splitting atoms
Nuclear Energy
energy from splitting atoms

26. Conserving Energy and Fossil Fuels

27. Energy Conversion A change from one form of energy to another
Most common conversion –
Potential Energy to Kinetic Energy

29. Friction Friction converts mechanical energy to thermal energy
Motion of the atoms or molecules increases

30. Einstein’s Theory of Relativity
Energy can sometimes be created by destroying matter.
Nuclear reactions – huge amounts of energy are produced by destroying tiny amounts of matter.
Energy and matter together
are always conserved.