Date:
Name:
Grade: 7
Total marks:25
Making Sense: Measurement
1. a. The diagram shows how a student attempted to measure the length of a piece of
wire.
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From the diagram, estimate the length of the wire ...........................................................
b. State three ways in which the student could have improved his technique for
measuring the wire.
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2.
The diagrams A–D show distance against time graphs for four moving objects.
Complete the table below by indicating (in the second column) the graph or graphs that
represent the motion described in the first column.
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3. Which thermometer mercury or one containing alcohol, could be used in a polar
region where the temperature reaches below -40oC? Explain your answer. [2]
4. The value of the gravitational field strength g is 10 N/kg on Earth and 1.5 N/kg on
the Moon.
An astronaut, who has a mass of 90 kg on the Earth, goes to the Moon. Show by
calculation how you determine
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(a) his weight on the Earth -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------(b) his mass on the Moon ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------(c) his weight on the Moon --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5. Of all the planets in our solar system, Jupiter has the greatest gravitational strength.
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a. If a 0.5 kg pair of running shoes would weigh 11.55 Newton on Jupiter, what is the
strength of gravity there?
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b. If he same pair of shoes weighs 0.3 Newton on Pluto, what is the strength of gravity on
Pluto?
-------------------------------------------------------------------------------------------------------------------------c. What does the pair of shoes weigh on earth?
------------------------------------------------------------------------------------------------------------------6. The speed of the train is 72 km per hour. Find its speed in metre per second.
7. Aaron ran 500 metre in 100 Seconds. Find the speed in km per hour.
8. Correct the statements given below:
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[2]
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1. The quantity of matter present in a body is called its weight.
--------------------------------------------------------------------------------------------------------------------2. The value of mass varies from place to place.
--------------------------------------------------------------------------------------------------------------------3. A physical balance is used to find the weight of an object.
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9. Circle the odd one out. Give the reason for your choice.
1. Mass, beam balance, kilogram, spring balance.
2. Weight, spring balance, Newton, kilogram
3. Scale pan, stirrups, stopper, pointer
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