We had our first magnets lesson today (12th November 2018) and we started to think about how magnetism is a force. We then watched this video to help us understand that forces can push and pull. We then moved on to think about how magnets interact with each other.
For this we took two bar magnets and arranged them in different ways then observed how the magnets interact. We noticed that if you put a magnet's north and south pole together then the magnets will pull towards each other (or 'attract') and if you put the north and north or south and south poles together they will push away from each other (or 'repel'.)
The particularly curious amongst us noticed that the magnets will still interact with each other even when they are not touching (e.g. through a table...) and we used that to discuss how magnetism is a non-contact force.
In our second magnets lesson we were continuing to investigate how magnets interact, but with a particular focus on three key questions:
We had already started to take notice of our key topic for lesson 3 in previous lessons when we found that the magnets would be attracted to some things - like a hair clip, or the table leg - but not others. We thought that perhaps this was because magnets attract to metal. To test this theory Miss Savage brought in a few things from home, like metal spoons, coins, aluminium foil and rings. We investigated whether or not the magnets attracted to all of these items and found the following:
From this we concluded that only some metals are magnetic.
Miss Savage told us that the following metals are magnetic:
She then explained that the spoon and paperclips are made out of steel, which is an alloy containing iron and other metals. The coins are the same because the coins are made of a copper alloy containing nickel - so the nickel in the coins was attracted to the magnet, not the copper!
Lesson 4 - Web Quest
This week we are learning about how magnets are used in everyday life. There are three main ways, which we are learning about:
Miss. Savage has set us a web quest so we can research and investigate these different items using the links below:
Speedometers also use magnets but in a much more complicated way!