📚 KS3 CIE Moments Worksheet Mark Scheme | KS3 CIE 力矩练习评分标准
Moments questions appear regularly in KS3 CIE Science assessments, especially in the physics sections on forces and motion. A mark scheme is a useful tool because it shows exactly where marks are awarded for method, substitution, accuracy, and units.
力矩题在 KS3 CIE 科学评估中经常出现，尤其在力和运动的物理部分。评分标准是非常有用的工具，因为它明确显示了在方法、代入、准确性和单位方面如何给分。
This article breaks down the key ideas behind moments and explains how to answer worksheet questions in the way examiners expect. It also includes worked examples and a mini mark scheme to help you self-assess.
本文分解力矩背后的关键概念，并解释如何按照考官期望的方式回答练习题。文中还包括例题和一个迷你评分标准，帮助你自我评估。
1. What Is a Moment? | 什么是力矩？
A moment is the turning effect of a force about a pivot. It does not measure how large the force is on its own; it measures how effective that force is at causing rotation.
力矩是力绕支点产生的转动效应。它并不单独衡量力的大小，而是衡量该力在引起转动方面的有效程度。
For example, pushing a door handle far from the hinge creates a larger moment than pushing near the hinge with the same force. That is why door handles are placed far from the hinge.
例如，用同样大小的力推门把手时，离铰链越远产生的力矩越大。这就是门把手要安装在远离铰链处的原因。
In KS3 CIE worksheets, you will often be asked to identify the pivot, the force, and the perpendicular distance before calculating a moment.
在 KS3 CIE 练习题中，你经常需要先找出支点、力和垂直距离，然后再计算力矩。
2. The Moment Equation | 力矩公式
orce is calculated using the equation: moment = force × perpendicular distance from pivot.
力矩的计算公式为：力矩 = 力 × 从支点到力的作用线的垂直距离。
M = F × d
Here, M stands for moment, F stands for force, and d stands for the perpendicular distance from the pivot to the line of action of the force.
其中 M 表示力矩，F 表示力，d 表示从支点到力的作用线的垂直距离。
The distance must be perpendicular, not just any distance along the object. If the force acts at an angle, only the perpendicular component is used.
这个距离必须是垂直距离，而不是沿物体的任意距离。如果力以一定角度作用，只使用垂直分量。
In KS3, most worksheet questions use forces that are already perpendicular, so d is usually given directly.
在 KS3 阶段，大多数练习题中的力已经是垂直的，因此 d 通常直接给出。
3. Units of Moment | 力矩的单位
Moment is measured in newton metres. The unit is written as N m, with a space between N and m.
力矩的单位是牛顿米，写作 N m，N 和 m 之间有一个空格。
Do not confuse newton metre with joules. Although 1 N m is numerically equal to 1 joule, energy and moment are different quantities.
不要把牛顿米和焦耳混淆。虽然 1 N m 在数值上等于 1 焦耳，但能量和力矩是不同的物理量。
In a mark scheme, the unit is often worth a separate mark. You must write 'N m' rather than 'N', 'm', 'Nm', or 'n/m'.
在评分标准中，单位通常单独占一分。你必须写成 'N m'，而不是 'N'、'm'、'Nm' 或 'n/m'。
For very small moments, you may also see N cm, but in CIE KS3 worksheets the standard unit is N m unless the question says otherwise.
对于很小的力矩，你可能也会看到 N cm，但在 CIE KS3 练习题中，除非题目另有说明，标准单位是 N m。
4. The Principle of Moments | 力矩平衡原理Published by TutorHao | KS3 Revision Series | aleveler.com
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