Week 3 Lesson Objectives
Now that you have watched the video, follow this link to google forms to summarise the main points for me.
What we did in class
This week, we investigated how an object moved over different materials when being pulled by a magnet through the material. All of the materials we tested were thin enough for the magnetic force to go through. Our materials were: paper, cardboard, plastic, buddle wrap and non-slip rubber.
To do this investigation we first predicted which materials we thought the paperclip would move the smoothest across when being pulled by the magnet and then we tried to give a reason why we thought that.
When we tested the different materials, we observed that the motion of the paperclip as it moved across the different materials was very different. On some materials like the paper and plastic it was the smoothest. On the cardboard the paperclip was jerky, but it was really hard to get the paperclip to move across the bubble wrap. The magnet was not able to pull the magnet across the non-slip rubber at all.
When we discussed our observations we talked about how different types of materials produced different amounts of friction. Friction is a force that opposes the motion of an object.
We discovered that the non-slip rubber had the most friction of all the materials we tried, because the paperclip would not move across its surface. It was too grippy.