Class 9 Practice Level 2 - Work and Energy - Set 1

Total questions: 25

A force of 50 N is applied to push a box 4 meters across a floor. If the force is applied at an angle of 30 degrees to the horizontal, what is the work done by the force?

Topic: Work

100 J

150 J

173.2 J

200 J

None

A car of mass 1000 kg is moving with a speed of 20 m/s. What is its kinetic energy?

Topic: Energy

100,000 J

200,000 J

300,000 J

400,000 J

None

If a pump raises 100 liters of water per minute to a height of 20 meters, what is the power of the pump? $ \displaystyle \left( {Take\text{ }g=10\,m/s2g\text{ },1\text{ }liter\text{ }of\text{ }water\text{ }=\text{ }1\text{ }kg} \right)$

Topic: Power

333 W

500 W

667 W

1000 W

None

An object is lifted vertically 5 meters by a force of 100 N. What is the work done against gravity?

Topic: Work

200 J

300 J

400 J

500 J

None

A pendulum bob of mass 0.5 kg is raised to a height of 0.2 meters. What is its potential energy at this height? $ \displaystyle \left( {Take\text{ }g=10\,m/{{s}^{2}}} \right)$

Topic: Energy

1 J

2 J

3 J

4 J

None

A machine does 4000 joules of work in 20 seconds. What is its power output?

Topic: Power

100 W

150 W

200 W

250 W

None

A boy pulls a cart with a force of 50 N over a distance of 10 meters in 5 seconds. What is the power exerted by the boy?

Topic: Work

50 W

100 W

150 W

200 W

None

A ball of mass 0.2 kg is moving with a velocity of 5 m/s. What is its kinetic energy?

Topic: Energy

1 J

2 J

2.5 J

3 J

None

If a motor does 1500 J of work in 5 seconds, what is its power output?

Topic: Power

200 W

250 W

300 W

350 W

None

10.

A crane lifts a load of 500 kg to a height of 10 meters. How much work is done? $ \displaystyle \left( {Take\text{ }g=10\,m/{{s}^{2}}} \right)$

Topic: Work

50,000 J

5000 J

25,000 J

1000 J

None

11.

A spring with a spring constant of 200 N/m is compressed by 0.1 meters. What is the potential energy stored in the spring?

Topic: Energy

1 J

2 J

0.5 J

10 J

None

12.

A person does 300 J of work by lifting a box in 6 seconds. What is the power developed by the person?

Topic: Power

40 W

50 W

60 W

70 W

None

13.

A force of 30 N is applied to move a box 7 meters. The force is applied at an angle of 45 degrees to the direction of motion. What is the work done?

Topic: Work

70 J

105 J

148 J

210 J

None

14.

A 2 kg object is dropped from a height of 10 meters. What is its kinetic energy just before it hits the ground? $ \displaystyle \left( {Take\text{ }g=10\,m/{{s}^{2}}} \right)$

Topic: Energy

100 J

150 J

200 J

250 J

None

15.

An electric heater uses 1500 J of energy in 10 seconds. What is its power rating?

Topic: Power

100 W

150 W

1500 W

15 W

None

16.

A person pulls a sled with a force of 40 N at an angle of 60 degrees to the horizontal. If the sled is pulled a distance of 5 meters, what is the work done?

Topic: Work

100 J

200 J

1000 J

300 J

None

17.

A 5 kg object is moving with a velocity of 10 m/s. What is its kinetic energy?

Topic: Energy

100 J

200 J

250 J

300 J

None

18.

A person does 600 J of work in 3 minutes. What is the power developed by the person in watts?

Topic: Power

2 W

3.33 W

5 W

10 W

None

19.

An electric motor lifts a 10 kg object to a height of 8 meters in 4 seconds. What is the power output of the motor? $ \displaystyle \left( {Take\text{ }g=10\,m/{{s}^{2}}} \right)$

Topic: Work

100 W

200 W

300 W

400 W

None

20.

A stone of mass 0.5 kg is thrown vertically upward with an initial velocity of 15 m/s. What is its kinetic energy at the highest point?

Topic: Energy

0 J

37.5 J

56.25 J

112.5 J

None

21.

An electric pump does 9000 J of work in pumping water in 60 seconds. What is the power of the pump?

Topic: Power

100 W

150 W

200 W

250 W

None

22.

A person pushes a 20 kg box with a force of 60 N over a distance of 3 meters in 15 seconds. What is the work done on the box?

Topic: Work

60 J

120 J

180 J

240 J

None

23.

A 1 kg ball is thrown vertically upwards with a speed of 10 m/s. What is the maximum height it reaches.$ \displaystyle \left( {Take\text{ }g=10\,m/{{s}^{2}}} \right)$

Topic: Energy

2 m

3 m

4 m

5 m

None

24.

A person weighing 600 N climbs a staircase of 10 meters height in 20 seconds. What is the power developed by the person?

Topic: Power

200 W

300 W

400 W

500 W

None

25.

If a machine does 3000 J of work in moving an object 10 meters, what is the force exerted by the machine?

Topic: Work

100 N

200 N

300 N

400 N

None

1 out of 25

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Class 9 Practice Level 2 - Work and Energy - Set 1

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