
第二冊 第一至二章 位置和移動
Quiz
•
Physics
•
9th Grade
•
Practice Problem
•
Medium
Cheung Man
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12 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
圖示一架小車的速度-時間線圖。求小車在首5 s的總位移。
20 m
50 m
75 m
100 m
Answer explanation
小車在首5 s 的總位移 = 尾3 s 的位移 – 首2 s 的位移
=
= 20 m
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
某校男生100米賽跑的紀錄為11.01秒。根據以上資料,可得出哪種物理量?
平均速率
瞬時速率
平均加速度
瞬時加速度
Answer explanation
A
由於欠缺瞬時距離和時間的資料,所以只能得出平均速率。
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
以下哪項/些是速率的單位?
(1) m s-1
(2) km h–1
(3) 英里每小時
只有 (1)
只有 (1) 和 (2)
只有 (2) 和 (3)
(1)、(2) 和 (3)
Answer explanation
D
速率 = 距離 / 時間
所以,全部都是速率的單位。
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下圖顯示四個物體的位移-時間線圖。哪個物體的速率最高?
物體 A
物體 B
物體 C
物體 D
Answer explanation
v是位移-時間線圖的斜率。斜率越大,速率便會越大。
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下圖顯示四個物體的位移-時間線圖。哪個物體處於靜止狀態?
物體 A
物體 B
物體 C
物體 D
Answer explanation
C
當物體處於靜止狀態時,它的位移保持不變。
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
以下哪幅/些線圖顯示一物體的運動方向有所改變?
Answer explanation
A
只有圖一顯示了運動的方向。速度是矢量。距離和速率都是標量。
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
圖示某物體的速度與時間線圖。物體在首3秒的位移是多少?
–10 m
- 15 m
15 m
30 m
Answer explanation
B
首3秒的位移
= 2 x (– 20) x 0.5 + (1) x (10) x 0.5
= –15 m
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