|
|
9.3
Word
Translation (8 marks)
i Write
down the English terms of the following Chinese terms:
|
|
Chinese
term
|
English
term
|
|
1
|
重力
|
Force of gravity
|
|
2
|
拉
|
Pull / Pulling
|
|
3
|
施加 (…於…)
|
Exert (…on…)
|
|
4
|
中心
|
Centre
|
|
5
|
天體
|
Celestial bodies
|
|
6
|
重量
|
Weight
|
|
7
|
質量
|
Mass
|
|
8
|
物質
|
Matter
|
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) 200 N. 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.
沒有留言:
張貼留言