1. Ch 15.1
Energy and Its Forms

2. Kinetic energy is moving energy, while potential energy is stored
True
False
Statement
Kinetic energy is moving energy, while potential energy is stored
PE = ½ mv2
KE = mgh
Bouncing a ball is an example of kinetic mechanical energy
Fission and fusion is an example of electromagnetic energy
Potential energy ahs 2 forms: gravitational and elastic

3. Energy and Work Work is done when a force moves an object a distance
Work is a transfer of energy
Energy is the ability to do work
Both measured in J

4. Kinetic Energy Energy of motion Depends on mass and speed KE = ½ mv2
SI Units:
KE- m- v-

5. KE Practice
A 0.10 kg bird is flying at a constant speed of 8 m/s. What is the birds kinetic energy?
Given:
Formula:
Solve:

6. Math Practice pg 448 1. 2. 3. 4.

7. Potential Energy Energy that is stored due to position or shape
Stored energy turns into KE

8. Potential Energy Gravitational PE Elastic PE
PE that depends upon an objects height
Increases with increased height
PE = mgh
SI Unit m- g- h-
PE that is stretched or compressed
Object springs back to its original shape

9. Forms of Energy Mechanical Thermal
Energy associated with motion and position of everyday objects
Sum of PE and KE
Total PE and KE of all the microscopic particles in an object
Particles move faster, becoming warmer

10. Forms of Energy Chemical Electrical Energy stored in chemical bonds
Energy associated with electric charges

11. Forms of Energy Electromagnetic Nuclear
Form of energy that travels through space in the form of waves
Energy stored in the atomic nucleus
Fission- releases energy, splits apart
Fusion- releases energy, comes together

12. Energy Conversion and Conservation
15.2
Energy Conversion and Conservation

13. Energy can not be converted into another form
True
False
Statement
Energy can not be converted into another form
Energy cannot be created or destroyed
To calculate conversions:
KE = PE
Einstein said E = mc2, where energy = mass x conservation2
Potential energy turns into kinetic energy

14. Conservation of Energy
Energy cannot be created or destroyed
It is transferred or converted

15. Energy Conversion Energy can be converted from 1 form to another
Process of changing energy – energy conversion
Gravitational PE converts into KE as an object falls

16. Energy Conversions Pendulums Pole Vaults
PE constantly converted back and forth to KE
Stays in motion due to weight
Pole Vaults

17. Energy Conversion Calculations
KE + PE = KE + PE
(Beginning) (End)
KE=
PE=

18. Conversion Practice
A 1.50kg brick is dropped from rest and hits the ground at a speed of 26m/s. Ignore air resistance, calculate PE before the brick was dropped.
Given:
Formula:
Solve:

19. Math Practice pg 458 1. 2. 3.

20. Energy and Mass Albert Einstein Theory of Relativity E = mc2
Energy and mass are equivalent and can be converted into each other
c= speed of light 3.0 x 108 m/s

21. Ch 15.3
Energy Resources

22. Nonrenewable resources take millions of years to be replaced
True
False
Statement
Nonrenewable resources take millions of years to be replaced
Renewable resources originate directly or indirectly from the sun
Hydroelectric energy is from water deep below the earths crust
Solar energy converts sunlight into useable energy
Biomass energy is from living things and can be converted into thermal energy

23. Nonrenewable Energy Exists in limited quantities
Once used, it can’t be replaced except over the course of millions of years
Natural Gas
Coal
Uranium
Also known as fossil fuels

24. Renewable Energy
Can be replaced in relativity short periods of time

25. Renewable Energy Hydroelectric Solar Energy from flowing water
Sunlight converted into useable energy

26. Renewable Energy Geothermal Others
Thermal energy beneath Earths surface
Others
Biomass Energy
Energy stored in living things
Hydrogen Fuel
Creates electricity by reacting hydrogen and oxygen

27. Conserving Energy Resources
Reduce energy needs
Increase the efficiency of energy use