Test- Energy

Question 1

A newton is always a

Answer 1

Force

Question 2

What does GPE=

Answer 2

GPE=hFm (f=ma)

Question 3

Bob used a force of 10 N to pull a 50 kg trunk a distance of 5 m in 2 seconds. Bob’s power is

Answer 3

25w

U7C4

Question 4

When water at 10°C is heated to 20° C its kinetic energy

Answer 4

Increases

U7C2

Question 5

The mechanical energy of a coconut falling from a tree

Answer 5

Remains constant

U7C2

Question 6

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

Answer 6

10 N

U7C4

Question 7

When an object absorbs energy, the change in temperature will be

Answer 7

Positive

U7C3

Question 8

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 8

the lowest point after the big drop

U7C2

Question 9

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

Answer 9

Velocity

U7C2

Question 10

Which pictures show the same type of thermal energy transfer?

Answer 10

being a pan on a stove and being an iron on an ironing board

Question 11

Plastic is an example of this

Answer 11

Insulator

U7C4

Question 12

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

Answer 12

GPE goes down, KE goes u

U7c2

Question 13

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 13

Point C, which is mid swing

U7C2

Question 14

A medicine ball has 10 J of energy and is thrown upward with a velocity of 2 m/s. What is its mass?

Answer 14

5 kg

U7C2

Question 15

Through which of the following will convection most likely occur?

Answer 15

Liquids and gasses

U7C3

Question 16

Amount of heat needed to raise the temperature of 1 kg of a material by 1 °C.____

Answer 16

Specific heat

U7C4

Question 17

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 17

Some of the potential energy in oil is converted into forms of energy other than electricity.

U7C2

Question 18

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

Answer 18

Kinetic energy

U7C4

Question 19

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

Answer 19

Increases

U7C4

Question 20

Heat (Q) is measured in

Answer 20

Joules

Question 21

Delta T is measured in

Answer 21

Specific heat