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9.3
Word
Translation (8 marks)
i Write
down the English terms of the following Chinese terms:
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Chinese
term
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English
term
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1
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天體
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Celestial bodies
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2
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中心
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Centre
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3
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施加 (…於…)
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Exerted (…on…)
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4
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重力
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Force of gravity
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5
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質量
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Mass
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6
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物質
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Matter
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7
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拉
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Pull / pulling
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8
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重量
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Weight
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Multiple Choice (5 marks)
Circle
the letter of the best answer for each question.
1. Which of the
following statements is/are correct?
(1) No force of
gravity acts on an object when it rests on a desk.
(2) An artificial satellite can move around the
Earth even though it has no engine.
(3) Raindrops fall down due to gravity.
A. (1)
only B. (3)
only C. (1)
and (2) only D. (2) and (3) only
2. Which
of the following instruments can be used to measure the force of gravity acting
on an object?
(1) Electronic balance (2) Spring
balance (3) Bathroom scale
A. (1)
and (2) only B. (1) and (3)
only C. (2) and (3) only D. (1), (2) and (3)
3. Andrew’s weight is 600 N on the Earth.
Estimate his weight on the Moon.
A. 0 N B. 100
N C. 600 N D. 3600 N
4. Which of the following statements about
weight is/are correct?
(1) Weight is a kind of force.
(2) The weight of an object depends only on the
amount of matter the object contains.
(3) An
object falls down because of its weight.
A. (1)
only B. (1)
and (2) only C. (1) and (3) only D. (2) and (3) only
5. Which of
the following statements is/are correct?
(1) Every object has the same mass
on the Earth and on the Moon.
(2) Every object has different
weights on the Earth and on the Moon respectively.
(3) The mass
of an object is the force of gravity acting on it.
A. (1)
only B. (3)
only C. (1) and (2) only D. (2) and (3) only
Fill in the Blanks (13 marks)
1 The Earth exerts a (1)pulling force on every object on or around it.
This force is called (2)force of gravity. It pulls objects towards the (3)centre of
the Earth.
2 The (4)weight of an object on the Earth is the force of gravity exerted by the Earth
on the object. It can be different when it is measured on different (5)celestial
bodies. Its unit is (6)newton.
3 The (7)mass of an object is the amount of matter it contains. It is (8)the
same in all places. Its unit is grams (g).
4 A 50 kg boy is weighing himself on planet X and the reading is 200N.
His mass on planet X is
(9)50 kg and is (10)50 kg on the Earth. The force of gravity exerted by
planet X on him is (11)200N. The force of gravity of planet X is (12)smaller (larger/smaller) than that of the Earth. His weight
on planet X is (13)smaller than his weight on the Earth.
(Hint:
1kg = 10N on the Earth)
Writing
Skill (3 marks)
1.
The Earth
exerts a force of gravity on every object on or around it. The force pulls the objects towards
the centre of the Earth.
2.
The Moon
exerts a force of gravity on every object on or around it.
The force pulls
the objects towards the centre of the moon.
Challenging
Questions (Bonus 2
marks)
Goku is
training himself in planet Y, of which the force of gravity is 100 times of
that of the Earth. Describe Goku’s feeling in planet Y.
Goku will feel very heavy as the force of gravity in planet Y is 100
times of that of the Earth.
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