This is an old clockwork toy. To make it go you have to wind it up. Amy winds it up. She is winding up a ______ inside the toy.

Studying forces in science you will have learned about elasticity, or stretchiness. You already know about springs and rubber bands. If you don’t stretch them too far, they will bounce back into shape. This is very useful. Rubber bands, springs and other elastic things have lots of uses. They can hold things together. They can make things bounce. They can make things more comfortable. How much do you know about what stretchy things can do?