Test Corretions Concept 3 And 4

Question 1

A constant force of 2.0 N is used to push a 3.0 kg box 4.0 m across the floor. How much work is done?

Answer 1

8 J

Question 2

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 2

25 W

Question 3

Which pictures show the same type of thermal energy transfer?

Answer 3

The 2 stoves

Question 4

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

Answer 4

positive

Question 5

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

Answer 5

heat flows from your hand to the ice cube.

Question 6

Plastic is an example of this.

Answer 6

Insulator

Question 7

Which picture shows thermal energy transfer by convection?

Answer 7

Stove with the teapot

Question 8

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

Answer 8

kinetic energy

Question 9

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

Answer 9

10 N

Question 10

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 10

35 degrees to 20 degrees