Toys and Physics – Magnetism

5.1. Magnetic toys – balls on plate

What happens
The idea of the game is to place all the six magnetic balls in the holes – and then remove them again without them clumping together.

The other toys is a set of magnets that 'float' above each other if placed correctly on the wooden stand.

Theory and teaching notes
This is a very difficult game that illustrates the principles of magnetic attraction. You also need a steady hand and an appreciation of the direction in which the balls are magnetised.

The magnetic disc must be placed with like poles facing each other to give mutual repulsion and the 'floating effect'.

5.2 Magnetic wheel

What happens
The wheel moves along the frame without coming off at the end.

Theory and teaching notes
The axle is magnetic. The stremgth of the magnetism is just strong enough to keep it attached to the frame as it moves along.

5.3 Magnetic chaos wheel

What happens
You spin one of the rotating set of magnets and watch the effect as it interacts with the other. It seems virtually impossible to predict the way in which they will move.

Theory and teaching notes
The interaction between the magnets will affect the motion to a greater or lesser extent depending on just how much energy is put into the system. The resulting motion depends critically on the speed at which you rotate one set of magnets initially. Chaotic motion results with both sets of magnets spinning backwards and forwards.

5.4 Floating barrage balloon

What happens
The barrage balloon floats above the ground.

Theory and teaching notes
There is a magnet in the balloon and in the ground. If these two magnets are aligned with like poles facing each other they will repel and so the balloon will float.