S2.5.2 For the adult
Measuring forces
How can I tell how big a pull is?
What this chapter teaches
A rubber band stretches more for a bigger pull, so its stretch measures the pull. A band and a ruler make a force meter. Force is measured in newtons, written N, and a small apple weighs about 1 newton.
Three questions to ask
There is no one right wording. Listen for the idea.
- What do you expect when you put one more stone in the cup, and why?
- Why does the same pull give the same stretch each time?
- How would you use a force meter to compare two bags?
After the chapter, the learner can
- Make a force meter with a rubber band and a ruler
- Explain that forces are measured in newtons
What they copy into their notebook
A rubber band stretches more for a bigger pull. A band and a ruler make a force meter. Force is measured in newtons, written N. A small apple weighs about 1 newton.