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Worksheets科学-简单机械
Total questions: 10
Worksheet time: 5mins
什么是简单机械？
What is a simple machine?
一种简单的工具
A very simple tool
一种容易操作的工具
A tool which is easy to operate
能帮助我们做较简易工作的廉价工具
A cheap tool which can do simple work .
能让我们更轻松和更有效率地完成工作的工具
A tool that makes work more easily and efficiently
什么是杠杆？
What is a lever?
一根绕着支点转动的硬棒
A rigid bar that rests on the fulcrum
一根绕着力点转动的硬棒
A rigid bar that rests on the load
一根绕着重点转动的硬棒
A rigid bar that rests on the effort
一根绕着地板转动的硬棒
A rigid bar that rests on the ground
哪项代表P？
Which of the following is P?
动力点 Effort
支点 Fulcrum
阻力点 Load
以下哪项有关杠杆的说明是正确的？
Which of the following explanations about lever is true?
杠杆由四点所组成
Lever consists of four parts
支点越靠近阻力点越省力
The fulcrum is near the load, less effort is needed
杠杆分为五类
Lever is categorized to 5 types
第三类杠杆最省力
The third type of the lever is the least effort needed
上图显示平政正在河边钓鱼。
下面哪项和 K 简单机械属于同一类杠杆？
Diagram above shows Ping Zheng is fishing
at the river.
Which of the following tools use the same principle with K?
上图显示一把胡桃夹。
哪个字母是机械的支点？
Diagram above shows a nutcracker.
Where is the fulcrum of this machine？
P
Q
R
S
上图显示独轮手推车。
下图哪个机械和上图是 同一类的杠杆？
Diagram above shows a trolley.
Which of the following tools use the same principle with the diagram above?
剪刀 Scissors
钓竿 Fishing rod
开瓶器 Bottle opener
镊子 Tweezers
以下都是第三类杠杆的例子， 除了
The following examples are third class lever, except
以下都是第二类杠杆的例子， 除了
The following examples are second class lever, except
以下都是第一类杠杆的例子，除了
The following examples are first class lever, except
