Find the kind of biro where you have to click the top to make the pen come out. Click it a few times.

Could you guess there was a spring in there?

How did you guess that?

Find a torch. With the help of an adult open it up and then take out the batteries.

Now look down into the torch and see a big spring in the bottom of the tube.

Put the batteries back and press on them gently. Feel the spring at work. The spring pushes against the batteries to hold everything tight.

Can you find other springs in your classroom?