Free Printable Chapter 8 - Work and power

Worksheets

Chapter 8 - Work and power - Part 2

Total questions: 20

Worksheet time: 15mins

Name

Class

Date

Which of the following is a true statement about work?

It measures how quickly an object accelerates

It measures how much effort is applied over a certain distance

It measures the change in an object's rate of speed

It measures how much time it takes to move a massive object

What does one newton exerted over a distance of one meter equal?

One watt

One hertz

One volt

One joule

You do 90 joules of work in 30 seconds. How much power have you generated?

30 watts

3 watts

120 watts

270 watts

You move an 8-newton weight five meters in 4 seconds. How much power have you generated?

160 watts

10 watts

6.4 watts

17 watts

Which of the following would produce the most power?

A mass of 10 kilograms lifted 10 meters in 10 seconds

A mass of 10 kilograms lifted 10 meters in 5 seconds

A mass of 5 kilograms lifted 10 meters in 5 seconds

A mass of 5 kilograms lifted 5 meters in 10 seconds

Work is done on an object when the object moves in the SAME direction in which the force is applied.

True

False

Power is the RATE at which work is done.

True

False

If 150 Joules of work is needed to move a box 10 meters, what force was used?

1500 N

15 N

1.5 N

150 N

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

Yes, work was done

No, work wasn't done

10.

If you increase your work and decrease your time, you will have

more power

less power

same amount of power

power rating can not be determined

11.

How much work is being done with 200 N of force over 426 meters?

85,200 J

45,620 J

90,480 J

62,329 J

12.

Work is done when a weightlifter holds a barbell still above his head.

True

False

13.

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

Yes, work was done

No, work wasn't done

14.

The amount of work done in a certain amount of time is known as

work

effort force

resistance force

power

15.

If you increase your work and decrease your time, you will have

more power

less power

same amount of power

power rating can not be determined

16.

If you have the same work as someone, but in less time

You are more powerful

You are less powerful

You have the same power

17.

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

15 J

45 J

0 J

5 J

18.

If 68 W of power is produced in 18 seconds, how much work is done?

1,224 J

0.264 J

3.77 J

12.24 J

19.

Trường hợp nào sau đây không có công cơ học?

Người lực sĩ nâng quả tạ từ dưới đất lên cao.

Người lực sĩ giữ yên quả tạ ở trên cao.

Người lực sĩ thả quả tạ rơi xuống đất.

Người lực sĩ đưa lên đưa xuống quả tạ lên cao.

20.

Đơn vị của công là

niutơn (N).

jun (J).

oát (W).

mã lực (HP).

Reset

Chapter 8 - Work and power - Part 2

Total questions: 20

Worksheet time: 15mins

Similar Resources on Wayground