

06 Feb TIMSS - 簡單機械
Presentation
•
Science
•
3rd Grade
•
Practice Problem
•
Medium
Fong I Lou
Used 3+ times
FREE Resource
5 Slides • 6 Questions
1
Simple Machines
6 Feb TIMSS
2
Objective:
Recognize that simple machines, (e.g., levers pulleys, gears, ramps) help make motion easier (e.g., make lifting things easier, reduce the amount of force required, change the distance, change the direction of the force).
3
簡單機械
槓桿
滑輪
齒輪
斜板
4
槓桿
可以繞著支點旋轉的硬棒
施力臂VS抗力臂
5
6
Multiple Choice
施力和施力臂固定時,抗力臂___,愈省力。
愈長
愈短
7
Multiple Choice
修剪樹木葉時拿的園藝剪刀,施力點在
園藝剪刀的中央
修剪枝葉的地方
樹枝
手握的地方
8
Draw
請圈出以下用具的支點
9
Multiple Select
以下哪些用具利用槓桿原理而省力?
榨汁機
園藝剪刀
開瓶器
鑷子
筷子
10
Multiple Choice
小明與美兒及志強在玩搖搖板。小明的體重和美兒相同,但志強的體重則是小明的兩倍。
以下哪一幅圖正確顯示小明與小美,然後與志強平衡的位置。
11
Multiple Choice
小芬有一個天秤及四個正方體。每個正方體的物質都不一樣。小芬每次把兩個正方體放在天秤上,圖中顯示她所觀察到的情況:
哪下那一項為有關正方體2的正確敍述?
它比正方體1,3及4重
它比正方體1重,但比正方體3及4輕
它比正方體3重,但比正方體1及4輕
它比正方體4重,但比正方體1及3輕
Simple Machines
6 Feb TIMSS
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