To help children describe the world by: emphasising that slip forces result in warming recognising that mechanical braking...

Classroom Activity 5-11

The hot bottle heats the air inside it. Once the air cools it takes up less space. The air pressure inside the bottle becomes...

At home 5-11 11-14

Put it in your living room and wait a day or two – it should start working again eventually. Batteries use chemical reactions...

At home 5-11 11-14