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Energy test          

1.        Use the words conduction, convection or radiation to fill in the spaces in the table below to show which type of heat transfer is most important in each case.

 

warming yourself in front of a bonfire

 

heat travelling along a teaspoon

 

water being warmed in an electric kettle

 

a room being warmed by a radiator

 

a firefighter keeping cool in a silver suit

 

 

2.        Fill in the spaces in the table below to show the type of energy being stored in each case.

 

a piece of coal

 

a piece of cheese

 

a stretched elastic band

 

a bag of flour positioned above a door

 

compressed steam in a power station

 

 

3.        Fill in the spaces in the table below to show the useful energy transfers that take place in each example. The first one is done for you.

 

EXAMPLE

ENERGY SUPPLIED

USEFUL ENERGY OUT

electric light bulb

electrical

light

microphone

 

 

car

 

 

gas fire

 

 

washing machine

 

 

battery

 

 

 

4.        Use the equation          Work done  =  force  x  distance moved           to fill in the missing data in the table

 

SITUATION

FORCE (N)

DISTANCE (m)

WORK (J)

open a drawer

10

0.5

 

walk upstairs

500

3.5

 

car engine

 

1000

2000000

dockside crane

8200

 

119720

climb a hill

500

 

300500

 

5.        A student has used the equation              Power  =  Work done  ¸  Time taken              to complete the table below.

The students answers are in italics. The information given to the student is in bold type.

Use the equation to check the students answers.

Put a tick or a cross in the box provided. If the answer is wrong write the correct answer in the box.

 

POWER (W)

WORK DONE (J)

TIME TAKEN (s)

a OR r

Correct answer if  one given is wrong

2000

100

20

 

 

10000

200

5

 

 

40

240

6

 

 

1200

9000

7.5

 

 

1650

49600

30

 

 

 

 

6.        Explain what is meant by a non-renewable resource.

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7.        Tick the correct box at the side of each of the following energy sources to show if they are renewable or non-renewable.

 

Energy resource

Renewable

Non-renewable

petrol

 

 

coal

 

 

uranium

 

 

wood

 

 

charcoal

 

 

 

8.        Some of our electricity comes from hydroelectric power stations. Give two advantages and two disadvantages of obtaining energy from this source.

 

Advantages of  hydroelectricity

Disadvantages of  hydroelectricity

 

 

 

 

 

9.        An astronaut has a mass of 75kg.

Use the equation          Weight = mass  x  gravitational field strength              to complete the table below.

 

Place

Gravitational field strength (N/kg)

Mass (kg)

Weight (N)

Earth

10

 

 

Moon

1.6

 

 

Pluto

0.35

 

 

 

10.     The astronaut’s space capsule has a mass of 6000kg. Calculate the kinetic energy of the capsule when it is travelling at 80m/s. ( Ke = 1/2 m v2 )

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11.     Calculate the gravitational potential energy of the capsule when it is 250m above the surface of the Moon (g = 1.6N/kg). ( GPE = mgh )

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