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Work, energy & power - CIE IGCSE Physics

Total questions: 34

Worksheet time: 1hrs 13mins

Name
Class
Date
1.

Equation for kinetic energy

a)

Kinetic energy = 12mv2Kinetic\ energy\ =\ \frac{1}{2}mv^2

b)

Kinetic energy = 12mv3Kinetic\ energy\ =\ \frac{1}{2}mv^3

c)

Kinetic energy = 12mvKinetic\ energy\ =\ \frac{1}{2}mv^{ }

d)

Kinetic energy = mv2Kinetic\ energy\ =\ mv^2

2.

Equation for gravitational potential energy (GPE)

a)

GPE = m×g×ΔhGPE\ =\ m\times g\times\Delta h

b)

GPE = m×Δg×hGPE\ =\ m\times\Delta g\times h

c)

GPE =Δm ×g×hGPE\ =\Delta m\ \times g\times h

d)

GPE=F×g×hGPE=F\times g\times h

3.
Link between force, work done and distance
a)
work done = force x distance
b)
work done = distance / force
c)
work done = force / distance
d)
work done = force x work
e)
work done = force / work
4.

Link between energy transferred and work done

a)

energy transferred = work done

b)

energy transferrred = 1/2 work done

c)

energy transferred = work done2

d)

energy transferred = 1 / work done

e)

energy transferred = 4/3 π x work done3

5.
Efficiency equation
a)
efficiency = useful output / total input
b)
efficiency = total output / total input
c)
efficiency = total input / total output
d)
efficiency = total input / useful output
e)
efficiency = useful output / useful input
6.

The unit of work is

a)

watt

b)

hertz

c)

joule

d)

pascal

7.

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

a)

A

b)

B

c)

C

d)

D

e)

E

8.

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

a)

Faster at the bottom of the steeper hill

b)

Faster at the bottom of the less steep hill

c)

Same speed at the bottom of both hills

d)

Can’t say without knowing the mass of the marble

9.

Four students run up the stairs in the time shown. Which student has the largest power output?

a)

A

b)

B

c)

C

d)

D

10.

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

a)

150 J

b)

0

c)

Can’t tell without knowing the mass of the ball

11.

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

a)

-18 J

b)

-10 J

c)

-8 J

d)

-2 J

12.

In the equation PE = mgh, what does the “g” mean?

a)

Acceleration due to gravity

b)

Force of gravity

c)

Weight of the object

13.

What is the unit for power?

a)

what

b)

watt

c)

joule

d)

Jewel-Osco

14.

Which requires more work – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal work

d)

no work is required for either because the movement is vertical

15.

Which requires more power – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal power output

d)

no power is required at all

16.

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

a)

400 J

b)

1000 J

c)

1600 J

d)

4000 J

17.

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

a)

400 W

b)

1000 W

c)

1600 W

d)

4000 W

18.
a)

A

b)

B

c)

C

d)

D

19.
a)

A

b)

B

c)

C

d)

D

20.
a)

A

b)

B

c)

C

d)

D

21.
a)

A

b)

B

c)

C

d)

D

22.

Electricity can be obtained from different energy resources. Which energy resource is used to obtain electricity without producing heat to boil water?

a)

coal

b)

geothermal

c)

hydroelectric

d)

nuclear

23.

If the mass of the cart is 15kg, how much is the potential energy of the cart?

a)

0J

b)

1.2J

c)

6J

d)

58.8J

24.

What are fossil fuels?

a)

energy producers that comes from radioactive elements

b)

a natural product that can be changed into other energy forms to do work

c)

energy resources that formed from buried plants and animals that lived a very long time ago

d)

resources that are replaced faster than they are used

25.

All of the following are fossil fuels EXCEPT

a)

oil

b)

water

c)

coal

d)

natural gas

26.

Where does nuclear energy come from?

a)

Electric generators

b)

radioactive elements

c)

fossil fuels

d)

geothermal energy

27.

Which of these originally got their energy from the sun? Choose all that are correct.

a)

Coal

b)

Nuclear power

c)

Tidal

d)

Wave

e)

HEP

28.

Which of these energy resources is the most reliable?

a)

Coal power

b)

Solar

c)

Wave

d)

Wind

29.

The law of conservation of energy states:

Choose 2

a)

Energy cannot be created or destroyed

b)

Only transformed from one type to another

c)

Energy can be created but not destroyed

d)

Energy cannot be transformed

30.

I throw my pen vertically up with 15J of kinetic energy. How much gravitational potential energy does it have at the top?

Assume no air resistance.

a)

0J

b)

15J

c)

0 - 15J

d)

Impossible to calculate

31.
What is the equation for calculating power?
a)
distance / time
b)
work x time
c)
work / time
d)
force x distance
32.

Which of these is the best answer to "state a disadvantage of coal energy"?

a)

Makes pollution

b)

Produces carbon dioxide which causes global warming

c)

Ugly to look at

d)

Expensive to run, lots of jobs

33.

Is "expensive" enough detail for an answer?

a)

No - be specific

b)

Yes - give me the mark

34.

Around Tongariro, there is a large HEP network that produces 4% of NZ's electricity.

Which of these are disadvantages of using HEP?

a)

Causes land to be flooded

b)

Can affect river levels and wildlife on rivers e.g. Whio ducks

c)

Expensive

d)

Ugly

e)

Produces carbon dioxide

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