Test - Unit 7 Energy

Question 1

1. Give an example of thermal energy transfer by convection?

Answer 1

a kettle boiling on a stovetop

Notes U7C3 pg.19

Question 2

2. Green plants convert light energy from the sun into ____ during photosynthesis.

Answer 2

chemical potential energy

Notes U7C1 pg.3

Question 3

3. When oil is burned to produce electricity, the electrical energy produced is less than the potential energy in the oil. Which best explains this observation?

Answer 3

Some of the potential energy in oil is converted into forms of energy other than electricity.
Notes U7C1 pg.3

Question 4

4. Transfer of energy by the movement of heated particles.

Answer 4

Convection

Notes U7C3 pg.19

Question 5

5. The diagram to the right shows four locations in a temperature field. The temperature of each location is given in degrees Celsius. Heat energy will normally flow from:

Answer 5

High temp to low temp

Notes U7C1 pg.3

Question 6

6. An example of an energy conversion from kinetic to thermal energy would be

Answer 6

friction

Notes U7C2 pg.11

Question 7

7. Give two examples of thermal energy transfer by conduction?

Answer 7

(a pan on a stove and iron on an ironing board)

Notes U7C2 pg.10

Question 8

8. The ____ energy of an object increases with its height.

Answer 8

gravitational potential

Notes U7C1 pg.3

Question 9

9. When water at 10oC is heated to 20o C its kinetic energy

Answer 9

increases

Notes U7C3 pg.20

Question 10

10. The sum of kinetic energy and potential energy within a system is called

Answer 10

mechanical energy

Notes U7C2 pg.10

Question 11

11. The picture below shows a person swinging a baseball bat, starting at point A. The gravitational potential energy of the bat would be the greatest at

Answer 11

point A (highest point)
Notes U7C2 pg.11

Question 12

12. Temperature measures the average ____ of the particles in a material.

Answer 12

kinetic energy

Notes U7C1 pg.2

Question 13

13. Energy Transformations: A piano would be an example of

Answer 13

Kinetic to Sound

Notes U7C2 pg.10

Question 14

14. The rate at which work is done is ____.

Answer 14

power

Notes U7C4 pg.27

Question 15

15. This roller coaster car starts from rest and moves along the track. At what point does the roller coaster car have the greatest potential energy?

Answer 15

highest point

Notes U7C2 pg.11

Question 16

16. The kinetic energy of an object increases as its ______ increases.

Answer 16

velocity

Notes U7C2 pg.10

Question 17

17. When an object is dropped what happens to potential and kinetic energy as it falls?

Answer 17

GPE goes down, KE goes up

Notes U7C4 pg.27

Question 18

18. Energy Transformations: A sling shot would be an example of

Answer 18

Elastic potential to Kinetic

Notes U7C1 pg.3

Question 19

19. As the time required to do a given amount of work decreases, the power developed

Answer 19

increases

Notes U7C4 pg.27

Question 20

20. What energy change do the appliances to these appliances all have in common?

Answer 20

They convert electrical energy to thermal energy

Notes U7C2 pg.10

Question 21

21. Through what phases of matter will convection most likely occur?

Answer 21

liquids and gases

Notes U7C1 pg.3