摩擦力+地心吸力
Quiz
•
Science
•
6th Grade
•
Practice Problem
•
Medium
pw poon
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12 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
哪一個是摩擦力的作用?
燈泡亮了
橡皮擦擦掉字迹
用吸管吸飲料
用湯匙抔飯吃
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
摩擦力是怎樣產生的?
當兩個物體加熱時。
兩個物體互相接觸時。
兩個物體產生推力和拉力時。
兩個物體往同一個方向移動時。
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
圖中的人為甚麼跌倒?
他喝醉酒。
推力把他推到。
水使鞋底與地面的摩擦力增加。
水使鞋底與地面的摩擦力减少。
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
火柴一擦就燃燒,主要原理是 _______.
摩擦力是有能量的推力。.
摩擦是物體產生了熱能。
摩擦能磨損物體的表面。
摩擦能阻礙物體的運動。
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
插圖顯示兩種高速的交通工具。這主要因為 __________.
使用高级的汽油
有流綫型的構造
没有與地面產生摩擦力
承載的搭客比较多
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
襪子的底部有止滑的顆粒,可以增加襪底與接觸面的摩擦力。
對
錯
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
膠瓶瓶蓋的刻紋
增加摩擦力
減少摩擦力
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