Free Printable Work Energy Power Efficiency

1.

Which of the statement below best describe work done?

a)

It is the ratio of energy output over the energy input

b)

It is the rate to do work

c)

It is the product of the force and the distance over which the force is applied

d)

It is the capacity to do work

2.

What is the unit for work done, power and force?

a)

Joules, Watt and Newton

b)

Newton, Watt and Joules

c)

Joules, Newton and Watt

d)

Watt, Newton and Joules

3.

Azri tries to lift a very heavy box but he was unable to move the box. Was there any work is done?

a)

Yes

b)

No

4.

It took 500 N of force needed to push a car by 400 cm. How much work was done?

a)

200,000 N

b)

20 J

c)

200 J

d)

2000 J

5.

Energy is the (a) to do work

6.

You are starting a car and start driving. What is the energy changes?

a)

Chemical energy to potential energy and kinetic energy

b)

Chemical energy to electrical energy and kinetic energy

c)

Electrical energy to chemical energy and kinetic energy

d)

Electrical energy to chemical energy and potential energy energy

7.

(a) refers to how fast a person or a machine work

8.

Which of the formula below is correct to calculate Power?

a)

$Force\ \times\ Dis\tan ce$

b)

$Force\times Acceleration$

c)

$\frac{1}{2}Mass\times Velocity^2$

d)

$\frac{Work\ Done}{Time}$

9.

What is the law of conservation of energy?

(a)

10.

Jenna is running with a velocity of 5 m/s. She has a mass of 65 kg. What is her kinetic energy?

a)

325 J

b)

162.5 J

c)

3185 J

d)

812.5 J

11.

A crane picks up a crate of mass 40 kg, lifting it 45 m into the air. What is the gravitational potential energy of the crane once lifted?

a)

1 800 J

b)

17 640 J

c)

392 J

d)

18 800 J

12.

What is the common source of chemical energy?

a)

Food and Chemical substances

b)

Chemical substances and flow of electron

c)

Food and plant

d)

Chemical substances and nuclear plant

13.

A crane drops a crate of mass 40 kg, and the kinetic energy of the falling crate is 18 kJ. What is the average velocity of the falling crate?

a)

0.9 m/s

b)

900 m/s

c)

45.9 m/s

d)

30 m/s

14.

Given that a car's maximum speed is 2.7 m/s and its engine generates a force of 960 N, determine the power of its engine.

a)

2592 W

b)

355.6 W

c)

6998.4 W

d)

131.7 W

15.

Efficiency has unit. is this true?

a)

No

b)

Yes

16.

Energy may be lost due to (a) between moving parts

17.

Input energy is the energy (a) by the machine.

18.

Output energy is the energy (a) to the machine

19.

Which of the following formula is correct for Efficiency?

a)

$\frac{Input}{Output}\times100$

b)

$\frac{Force}{Power}$

c)

$\frac{Workdone}{time}$

d)

$\frac{Output}{Input}\times100$

20.

An electric engine transfer 300 J of electricity to 280 J of heat energy and wasted 20 J into sound energy. What is the efficiency of the kettle?

a)

100%

b)

93.3%

c)

107.1%

d)

6.7%

21.

The efficiency of LED lamp is 80%. if 60 J is supplied to the lamp, what is the useful energy?

a)

4800 J

b)

480 J

c)

48 J

d)

4.8 J

Work Energy Power Efficiency

Total questions: 21

Worksheet time: 10mins

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