1. Energy Mr. Skirbst Physical Science Topic 07

2. What is energy?

3. -It is the ability to do work or cause change (remember: work = force x distance) Unit of energy = Joule

4. 5 FORMS of Energy

5. 1.Mechanical - “matter in motion” - (ex. ball, bike, run, blood)

6. 5 FORMS of Energy 2.Heat - “atomic motion” - (ex. melting, evaporation)

7. 5 FORMS of Energy 3.Chemical - “atomic bonding” - (ex. burning, reactions)

8. 5 FORMS of Energy 4.Electromagnetic - “moving electrons” - (ex. electricity, lights, motors)

9. 5 FORMS of Energy 5.Nuclear - “fusion / fission” - (ex. stars, atomic bomb)

10. 2 STATES of Energy

11. 1.Kinetic (Greek – “kinetikos” motion) - energy of motion

12. 2 STATES of Energy * depends upon mass & velocity K.E. = (mv 2 ) / 2 m = mass; v = velocity

13. 2 STATES of Energy 2.Potential - energy of position * stored energy (ex. food, fuel, suspended objects)

14. 2 STATES of Energy “The bigger they are, the harder they fall” P.E. = mgh m = mass; g = gravity; h = height

15. Energy Conversions Energy can be transferred from one object to another & from one form to another

16. Example Problems m = 2 kg;v = 2 m/sec