Types of Energy!

What is energy?

• Energy is the ability to cause change (or to do work)

Kinetic Energy

• Kinetic Energy is the energy an object has because of its motion.

• Depends on the object’s speed and its mass.

Potential Energy

• Potential Energy is the energy stored in an object because of its position/height.

• Depends on its height/position and its mass.

Roller Coasters!!

• At the top of the first and tallest hill, the car has the greatest potential energy.

• This potential energy is transformed into kinetic energy as it races down the hill.

Thermal Energy

• All objects have thermal energy (heat), which, increases as the temperature increases.

• Which has more thermal energy…a block of ice or a cup of water?

Radiant Energy• The energy carried by

light is called radiant energy.

• When radiant energy is absorbed it can become thermal energy (like a

black jacket on a hot day) • Name 3 objects that

have radiant energy….

Electrical Energy

• Electrical energy is the energy carried by electric current (created by electrons moving from atom to atom in a flow).

• Power plants generate electrical energy.

• How do these power plants generate electricity?

Chemical Energy

• Chemical energy is the energy stored in chemical bonds.

• Examples:– Food (ex. photosynthesis)

– Fuels (ex. natural gas, oil, coal)

Nuclear Energy• Nuclear energy (also called

atomic energy) is the energy within the nuclei of atoms.

• Nuclear energy is released by the splitting (fission) or merging together (fusion) of the nuclei of atom(s).

• It is nuclear fission that we use as a power source to give us nuclear power.

Playing Basketball…

• When dribbling a basketball, what types of energy does the ball have and how do they change throughout the movement?

Classwork / Homework Answers

Workbook – C13, S1• “Before you read” – answers will vary• Highlight / UnderlineText – check for completion• 1. – A slower moving object has less kinetic

energy; an object with less mass has less kinetic energy also

• 2. – The top vase will have more potential energy; potential energy is affected by position (height) and mass

• 3. – greatest thermal energy = hot coco

- least thermal energy = ice

Classwork / Homework Answers

Workbook – C13, S1• 4. – Food has stored chemical energy that our

bodies use. • 4. continued… Food’s chemical energy comes

from the food chain which is started through photosynthesis where radiant energy from the sun is transformed into chemical energy for fuel.

• 5. When an object absorbs light energy, the object gets warmer (like a black shirt on a hot day in the sun)

• 6. – 220V electrical outlet

Classwork / Homework Answers

Workbook – C13, S1• 1. – Potential energy is stored energy relating to

its position and depends upon its height and mass. Kinetic energy is the energy of motion and depends upon the object’s speed and mass.

• 2 – potential energy = book on a shelf• Kinetic energy = a ball rolling• Electrical energy = the energy that makes a TV work• Thermal energy = the energy in a hot cup of tea• Chemical energy = the energy in food• Nuclear energy = the energy in an atom’s nucleus• Radiant energy = a lamp giving off light

Classwork / Homework Answers

Worksheets – C13, energy (pg. 17)• 1. power plants• 2. solar/light• 3. food and fuel• 4. nuclear• 5. magma• 6. light/solar• 7. position

Classwork / Homework Answers

Worksheets – C13, energy (pg. 25)• 1. Energy is the ability to cause change• 2. It has energy if it is causing change or can

cause change• 3. kinetic and potential• 4. radiant and thermal• 5. electrical (and chemical)• 6. chemical• 7. potential• 8. chemical• 9. radiant

Classwork / Homework Answers

Worksheets – C13, energy (pg. 25)• 10. nuclear• 11. thermal• 12. kinetic• 13. kinetic• 14. transferring• 15. greater• 16. less• 17. potential energy• 18. more• 19. more

Classwork / Homework Answers

Textbook – Chapter Review – C13, energy (pg. 400)

• 10. C - potential• 11. D - radiant• 12. D – chemical to kinetic (food to motion)• 14. A - chemical• 20. answers will vary• 21. answers will vary

Classwork / Homework Answers

Textbook – Chapter Review – C13, energy (pg. 402)

• 2. B - 2002• 4. D - 2028• 6. C – 7.6 (38.2 * 20% = 7.6)• 8. B – potential to kinetic