Test - Unit 7 Energy

Question 1

3. Where would this roller coaster have the greatest kinetic energy?

Answer 1

The bottom of the biggest drop

Unit 7 Concept 1 pg 1

Question 2

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

Answer 2

Chemical potential energy

Unit 7 concept 1 pg 2

Question 3

7. 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 3

When he swings and hit the ball

Unit 7 Concept 2 pg 2

Question 4

11. How much force is required to lift a rock a vertical distance of 8 m if 80 J of work were done?

Answer 4

10 N

Unit 7 Concept 3 pg 2

Question 5

14. Conduction is the transfer of heat energy by______ .

Answer 5

Electromagnetic waves

Unit 7 Concept 2 pg 1

Question 6

20. 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 6

Heat energy flows from high to low.

Unit 7 Concept 3 pg 1

Question 7

21. 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 7

Some of the potential energy in oil is converted into forms of energy other than electricity.
Unit 7 Concept 1 pg 2

Question 9

26. Which pictures show the same type of thermal energy transfer?

Answer 9

The pan and the ironing board

Unit 7 Concept 2 pg 1

Question 10

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

Answer 10

Power

Unit 7 Concept3 pg 2

Question 11

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

Answer 11

GPE goes down, KE goes up

Unit 7 Concept 2 pg 2

Question 12

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

Answer 12

Increases

Unit 7 Concept 1 pg 1

Question 13

35. Through which of the following will convection most likely occur?

Answer 13

Liquids and gasses

Unit 7 Concept 3 pg 1

Question 14

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

Answer 14

Velocity

Unit 7 Concept 3 pg 1

Question 15

38. 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

At the top of the roller coaster

Unit 7 Concept 2 pg 1

Question 16

39. When you hold an ice cube, your hand feels cold because

Answer 16

heat flows from your hand to the ice cube.

Unit 7 Concept 3 pg 1

Question 17

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

Answer 17

Increases

Unit 7 Concept 3 pg 3

Question 18

41. Energy Transformations: A windmill would be an example of

Answer 18

Kinetic to electrical

Unit 7 Concept 2 pg 1