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WorksheetsForce Revision
Total questions: 23
Worksheet time: 14mins
Which of the following is/are unit(s) of speed? 以下哪項（些）是速率的單位？
(1) only
(1) and (2) only
(2) and (3) only
(1), (2) and (3)
An object is said to be in uniform motion when it is moving
物體進行勻速運動，是指
at a constant speed in a fixed direction 物體以不變的速率向固定的方向移動。
at a constant speed and a changing direction.物體以不變的速率改變方向地移動。
at a changing speed in a fixed direction.物體以改變的速率向固定的方向移動。
at a changing speed and a changing direction.物體以改變的速率改變方向地移動。
When you squeeze a sponge, the force applied changes the sponge’s
當你擠壓一塊海綿時，力改變海綿的
mass. 質量。
speed. 速率。
direction of motion. 運動方向。
shape. 形狀。
Which of the following can be used to measure force?
以下哪項（些）工具可用來量度力？
(2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
A force can力可以
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1)、(2)和(3)
Which of the following is/are non-contact force(s)?
以下哪項（些）是非接觸力？
(1) only
(2) only
(1) and (3)
(2) and (3)
The Earth holds the Moon in orbit by
地球和月球之間存在哪一種力，令月球圍繞着地球運行？
frictional force. 摩擦力
repulsive force. 排斥力
the force of gravity. 重力
magnetic force. 磁力
以下哪項有關重量和質量的敍述是正確的？
Which of the following statements about weight and mass is correct?
The weight of an object on the moon is the same as that on the Earth.同一物體在地球和月球上的重量是相同的。
The mass of an object on the moon is the same as that on the Earth.同一物體在地球和月球上的質量是相同的。
The weight of an object on the moon is about one-third as that on the Earth.同一物體在月球上的重量大約是在地球的三分一。
The mass of an object on the moon is about one-sixth as that on the Earth.同一物體在月球上的質量大約是在地球的六分一。
Which of the following ways can reduce the friction between two surfaces?以下哪種方法可以減少兩個表面之間的摩擦力？
(2)
(1) and (2)
(2) and (3)
(1),(2) and (3)
Which of the following is/are use(s) of friction? 以下哪項（些）情況運用了摩擦力？
(1)
(1) and (2)
(2) and (3)
(1), (2) and (3)
In which of the following activities can we experience motion similar to frictionless motion? 在以下哪項（些）活動中，我們可以體驗到近似無摩擦運動的情況？
(1)
(2)
(1) and (3)
(2) and (3)
Action and reaction 作用力和反作用力的
have different sizes and act in the same direction. 大小不相同，方向相同。
have different sizes and act in opposite directions. 大小不相同，方向相反。
have the same size and act in the same direction. 大小相同，方向相同。
have the same size and act in opposite directions. 大小相同，方向相反。
The following diagram shows how a frog’s leg pushes the ground to jump forward. Which of the following red arrows shows the direction of the reaction acting on the leg of the frog?下圖顯示一隻青蛙正用力跳起，哪一個箭頭代表地面施加於青蛙後腳的反作用力？
A
B
C
D
A rocket for a space flight works mainly by making use of 火箭主要利用以下哪種力來運作？
friction. 摩擦力
the force of gravity. 重力
an action-and-reaction pair 作用力和反作用力
a balanced force. 平衡力
Car P are at rest after 汽車P在哪時開始停駛？
5s
10s
15s
20s
What is the average speed of car P from 0 to 15 s?汽車P在0至15 s的平均速率是多少？
15 m s-1
20 m s-1
25 m s-1
30 m s-1
What is the average speed of car Q from 0 to 20?
汽車Q在0至20 s的平均速率是多少？
10 m s-1
13.3 m s-1
15 m s-1
20 m s-1
What is the unit of measurement of the following instrument? 以下工具的量度單位是甚麼？
m s-1
mL
N
°C
Which of the following statements about mass and weight is/are correct? 以下哪項有關重量和質量的敍述是正確的？
(1)
(2)
(1) and (3)
(2) and (3)
When a skydiver is falling freely in air, 當一個跳傘員下墜時，
his weight becomes zero. 他的重量為零。
his weight increases. 他的重量增加。
his weight decreases. 他的質量減少。
his weight remains unchanged. 他的質量維持不變。
What is the reaction force acting on Joe? 施加在祖宏身上的反作用力是多少？
1.5 N to the left（向左）
1.5 N to the right（向右）
3 N to the left（向左）
3 N to the right（向右）
If the trolley remains at rest, what is the friction acting on the trolley? 如果小車維持靜止不動，作用在小車的摩擦力是多少？
1.5 N to the left（向左）
1.5 N to the right（向右）
3 N to the left（向左）
3 N to the right（向右）
Which of the following pairs of arrows correctly represent the action and reaction involved in kicking a football. 以下哪一對箭號正確表示踢球時所涉及的作用力和反作用力？
A
B
C
D
