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1. Complete
the following sentences using some
of the words in the box:
sun water
food kinetic work soil electricity
a)Without energy nothing would __________.
b)Our bodies get their energy from ________.
c)Plants get their energy from the
_________.
d)Most of the energy on Earth comes from the _________.
/4
2. Only
two of the following sentences are true. Choose by writing true against them. The remainder are all false.
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false |
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Energy can be destroyed. |
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Energy can be made. |
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Energy can not be destroyed. |
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|
Solar powered calculators can make their own
energy. |
|
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Energy can not be made. |
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/2
3. Choose
the correct form of energy to describe the activities from those listed in the
box:
Heat energy Light energy Chemical
energy
Electrical energy Kinetic energy Gravitational
potential energy Elastic
potential energy Sound
energy
a) A
moving ball. _______________
b) A
loud sound. _______________
c) A
bright light. _______________
d) A
wind blowing. _______________
e) A
hot bath. _______________
f)
A lump of coal. _______________
g) A
cheese sandwich. _______________
h) A
rock at the top of a mountain. _______________
i)
A stretched spring. _______________
j)
A parked car full of petrol. _______________
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4. The
next three questions are about energy forms that can move from one place to
another.
Example What kind of energy transfers from a
plug to your stereo ? Electrical energy
a)What kind of energy transfers from a
loudspeaker into your ear ? ____________
b)What kind of energy transfers from a T.V.
into your eyes ? ____________
c)What kind of energy transfers from a
heater into your room ? ____________
/3
5.
a)How
can we make the dynamo produce electricity ? ________________________________
b)The
dynamo converts ________________ energy into ______________ energy. /3
6.
a)The
fuel is burnt so the ______________
energy in the fuel is converted into _________ energy.
b)The
water in the steam engine gets very hot and becomes steam. The steam pushes the
piston and makes it move so the heat energy has been converted to ___________
energy.
c)The
piston makes the dynamo turn, the dynamo converts
__________ energy into electrical energy. /4
7.
a)
A calculator with a solar cell does not
need batteries because the solar cell converts ______________ energy into
________________ energy.
/2
8. A
car is filled up with petrol, the car is driven for a
week and then has to be refilled with petrol. If energy is always conserved,
explain why the car has to be refilled with petrol.
________________________________________________________________________________________________________________________________________________________________________________________________________________
/5
9.
Janet investigates how
things heat up. She gets two metal blocks, one made of copper and one made of
aluminium. She weighs both blocks and they have exactly the same weight. She uses two thermometers and a stopwatch.
Using two identical electric heaters
and using the same amount of electricity
she heats up both the copper and aluminium blocks.
She finds that the temperature of the copper block rises
faster than the temperature of the aluminium block. After 10 minutes she
finds that the temperature of the copper block is 200 degrees Celsius and the
temperature of the aluminium block is only 100 degrees Celsius.
*
this question is continued onto the next page
Results
of the investigation.
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Temperature at start |
Temperature after 10 minutes. |
|
Aluminium Block |
20 °C |
100 °C |
|
Copper Block |
20 °C |
200 °C |
a)Which block had the greatest temperature increase ? ________________ /1
b)Is there any difference in the amount of heat energy each block has gained ? _______
/1
c)Explain how you know the answer to the last question ? __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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