This very simple to perform demo can be made very memorable by ensuring the students see it as a discrepant event. Students are expecting to see a free fall but instead see a low terminal velocity with no obvious source of friction.
There are a number of things that can help your balance. You could try walking with books on your hand, walking a tightrope, or taking some ballet classes. If you’re a hex nut, however, you’re going to need some help from magnets and their magnetic fields. Do you think you have the magnetism it takes to master the Balancing Hex Nut Challenge?
- 4 soda cans
- 2 ceramic magnets
- 5 hex nuts
- Tall drinking glass (empty)
- Adult supervision
Armed with a large neodymium magnet, an aluminium tube and a set of scales, Andy explores the interaction of forces generated as the magnet falls and the effect these forces have on the objects’ weight.
Mention the word magnetism and most of us think of one iron-based object attracting another. This form of magnetism is called ferromagnetism. Iron, nickel and cobalt are the most common elements that exhibit ferromagnetic properties. However, two other less familiar forms of magnetism also exist. These are called paramagnetism and diamagnetism. This video shows an example of diamagnetic of an unlikely object – a tomato.
The following video provides a useful summary of how the three forms of magnetism differ.
How would you use this resource with your class? Please share your ideas using the comment bubble.