# Understand Stretching

In this worksheet, students will learn how things stretch.

Key stage:  KS 3

Curriculum topic:   Physics: Motion and Forces

Curriculum subtopic:   Forces

Popular topics:   Physics worksheets

Difficulty level:

#### Worksheet Overview

This is a force meter. It is used to measure forces. The spring inside it stretches when pulled and there is a scale in Newtons that shows the force applied to it. Springs are elastic because they go back to their original shape after being stretched.

When you first hang something on a force meter, the forces are unbalanced, so it begins to stretch. As it stretches, it produces a bigger force pulling the object towards itself until the forces are balanced and the stretching stops. Then you can see the weight of the object.

Robert Hooke was a famous British scientist whose work led to the invention of the force meter. The unit of the force though, Newton, was named after his rival scientist Isaac Newton!

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