The 6 ‘simple machines’ that we all use everyday:

1. What is a lever, and what are the different classes of lever: here
2. Wheels and axles and different combinations for going round corners: here
3. The pulley wheel and the block and tackle (also called a pulley sometimes): here
4. An inclined plane: here
5. The wedge
6. The screw

Building a class 3 lever such as a pair of tweezers

More useful mechanisms that we should know about so we can use them to help us solve bigger challenges.

1. The universal joint – transmitting power between shafts: here
2. Rack and pinion – steering

The universal joint