Free Printable Power, work and energy

1.

The energy store of a banana

a)

Chemical

b)

Kinetic

c)

Light

d)

Sound

2.

The energy store of a wind turbine

a)

Chemical

b)

Kinetic

c)

Light

d)

Nuclear

3.

The energy store of a cat up a tree

a)

Gravitational potential

b)

Kinetic

c)

Chemical

d)

Elastic

4.

The energy store of a battery

a)

Gravitational potential

b)

Kinetic

c)

Chemical

d)

Elastic

5.

The energy store of a stretched balloon

a)

Gravitational potential

b)

Kinetic

c)

Chemical

d)

Elastic

6.

State the intended change in energy store in a solar cell

a)

solar to electrical

b)

light to electrical

c)

electrical to light

d)

solar to light

7.

State the intended change in energy store in a kettle

a)

electrical to sound

b)

electrical to kinetic

c)

electrical to heat

d)

electrical to nuclear

8.

State the intended change in energy store in a loudspeaker

a)

kinetic to electrical

b)

sound to electrical

c)

electrical to sound

d)

sound to kinetic

9.

State the intended change in energy store in a microphone

a)

electrical to kinetic

b)

sound to electrical

c)

electrical to sound

d)

sound to kinetic

10.

State the intended change in energy store in a food blender

a)

electrical to kinetic

b)

sound to electrical

c)

electrical to sound

d)

sound to kinetic

11.

Total energy = 350J
Useful energy = 70J

Workout the efficiency of this iphoneX.
$efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%$

a)

100%

b)

80%

c)

40%

d)

20%

12.

Total energy = 1000000J
Useful energy = 850000J

Workout the efficiency of this airplane. $efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%$

a)

85%

b)

10%

c)

40%

d)

20%

13.

Total energy = 150J
Useful energy = 20J

Workout the efficiency of this xbox charger. $efficiency\ =\ \frac{useful\ energy}{total\ energy\ in\ }\ \times100\%$

a)

13.33%

b)

14%

c)

67%

d)

20%

14.

Total energy = 250J
Useful energy = 50J

Workout the efficiency of these fairy lights. $efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%$

a)

13.33%

b)

14%

c)

20%

d)

21%

15.

This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?

a)

13600J

b)

3600J

c)

5000J

d)

8600J

16.

In energy transformations, "wasted energy" usually takes what form?

a)

heat

b)

chemical energy

c)

light

d)

sound waves

17.

No machine in existence has 100% efficiency due to ____________________.

a)

magic

b)

friction

c)

smoke

d)

input

18.

The units of work are

a)

Joules

b)

Seconds

c)

Metres

d)

Sweat

19.

The units of distance are

a)

Joules

b)

Seconds

c)

Metres

d)

Sweat

20.

The units of time are

a)

Joules

b)

Seconds

c)

Metres

d)

Sweat

21.

Walking uphill involves working against

a)

Friction

b)

Gravity

c)

Gravity and friction

d)

My large breakfast

22.

Pushing a trolley across a rough surface involves doing more work because .......

a)

There is a bigger force of friction

b)

The is a smaller force of friction

c)

I have to push it further

d)

It's annoying

23.

Force = 200N, distance = 5m

Calculate the work done with the equation

Work done = force x distance

a)

1000J

b)

100J

c)

40J

d)

10000J

24.

Force = 350N, distance = 7m

Calculate the work done with the equation

Work done = force x distance

a)

2450J

b)

245J

c)

50J

d)

24500J

25.

Force = 400N, distance = 50m

Calculate the work done with the equation

Work done = force x distance

a)

20000J

b)

2000J

c)

8J

d)

240000J

26.

Force = 400N, distance = 5km

Calculate the work done with the equation

Work done = force x distance

a)

2000000J

b)

2000J

c)

80J

d)

0.08J

27.

Force = 600N, distance = 50m

Calculate the work done with the equation

Work done = force x distance

a)

30000J

b)

3000J

c)

6J

d)

300000J

28.

In physics, power is the rate at which _________ is used.

a)

Current

b)

Speed

c)

Energy

d)

Force

29.

Standard unit for Power

a)

Ampere

b)

Newton

c)

Joule

d)

Watt

30.

One watt is equal to one ____________

a)

joule per second

b)

meter per second

c)

ampere per second

d)

watt per second

31.

Two factors that determine work are

a)

size of the force, and distance

b)

size of the force, and type of force

c)

mass, and distance

32.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

33.

P=25W E=5000J t=???

a)

200s

b)

0.0005

c)

125000s

d)

125s

34.

How much time is needed to do 720J of work at a power of 90W?

a)

0.125 s

b)

8 s

c)

64800 s

d)

80 s

35.

Power is defined as the quantity that measures the rate at which _____ is done or energy is transformed.

a)

energy

b)

time

c)

work

d)

elasticity

36.

A swimmer generates a power of 150W. What does that mean?

a)

The swimmer does 150J of work every second

b)

The swimmer does a total of 150J of work

c)

The swimmer transfers 150J of chemical energy to kinetic energy

37.

A formula 1 car generates a power of 10000W. What does that mean?

a)

The formula 1 car converts 10000J of chemical energy every second to kinetic, heat and sound energy

b)

The formula 1 car converts 10000J of chemical energy every second to kinetic energy

c)

The formula 1 car converts a total of 10000J of chemical energy to kinetic, heat and sound energy

38.

What is the advantage of using a ramp to move a heavy object?

a)

The ramp reduces the force required to move the heavy object

b)

The ramp reduces the amount of work done to move the heavy object

c)

Using a ramp is easier than a straight lift

39.

What is the disadvantage of using a ramp to move a heavy object?

a)

The ramp reduces the force required to move the heavy object

b)

The ramp increases the amount of work done to move the heavy object

c)

Using a ramp is easier than a straight lift

40.

A light bulb has a useful power output of 25W and a total input power of 40W. Calculate its efficiency

a)

62.5

b)

62.5%

c)

160%

d)

37.5%

Power, work and energy

Total questions: 40

Worksheet time: 40mins

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