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9.1
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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力
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Force
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2
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運動
|
Motion
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3
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方向
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Direction
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4
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速度
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Speed
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5
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彈簧秤
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Spring balance
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6
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牛頓
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Newton
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7
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接觸力
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Contact force
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8
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非排觸力
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Non-contact force
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Multiple Choice (4 marks)
Circle
the letter of the best answer for each question.
1. A force CANNOT change
____________________ .
A. the speed of motion of an object
B. the shape of an object
C. the mass of an
object
D. the direction of motion of an object
2. When a volleyball player hits the ball,
the applied force changes ____________________ .
A. the mass of the ball
B. the weight of the ball
C. the speed of motion of the ball
D. the speed and
the direction of motion the ball
3. Which of the following statements about
forces is/are correct?
(I) A
spring balance is used to measure forces.
(II) A
force can change the speed of a moving object.
(III) A force can make an object move, but it
cannot stop a moving object.
A. (I) and (II)
only
B. (I) and (III) only
C. (II) and (III) only
D. (I), (II) and (III)
4. Which of the following statements about a
spring balance is correct?
A. It can be used to measure a contact force,
but not a non-contact force.
B. It can be
used to measure friction.
C. We may get different readings if we measure
the same force on different celestial bodies.
D. If the spring
in a spring balance is replaced, the pointer will always point at the same position when measuring the same force.
Fill in the Blanks (9 marks)
1 A (1) force can start and (2)
stop the motion of an object.
2 A force can also change the (3)
speed / direction and the (4) direction
/ speed of motion of an object.
3 (5) Spring balance is an instrument which is used to measure forces. The
unit of force is (6) newton and the symbol is (7) N.
4 The
forces that act on object through direct contact are known as (8) contact force.
The forces that can act on objects without direct contact are called (9) non-contact force.
Challenging
Questions (Bonus 2
marks)
1.
Describe one
effect of forces seen when a bowling ball hits the pins.
The force starts the motion of the pins / changes
the direction or/and the speed of the the motion of the pins.
_________________________________________________________________________________
2.
When a
football player kicks the moving ball, the force changes the direction and the speed of the motion of the
ball.
_________________________________________________________________________________
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