Week 4 Lesson Objectives
What we did in class
What a fun lesson we had this week! We got our brains thinking about air, by asking ourselves the questions, What is air? and Where is air?
We were given a plastic bag and told to go and look for some air and find the best air possible to fill the bags. We found air out the windows, coming from the projector, under the fans and on the balcony. Some people used their breath. What we learned from this activity is that air is all around us and it is a substance that takes up space.
We then watched a demonstration. Mrs Marini showed us a tissue and a jug of water. She asked if we thought she could put the tissue in the jug without it getting wet. No, of course not! Well, guess what, she did!
She pushed the tissue in the end of a plastic cup, turned the cup upside down and put in in the water. The water didn't go in the cup and the tissue stayed dry! This is because the cup was full of air, even when it was upside down it was still full of air. So when she pushed the cup under the water, the air had nowhere to escape and couldn't let the water in.
Then we had a competition to see which group could make a piece of paper fall the to the ground the slowest. We talked about how we could change the shape of the paper or the direction we dropped it and it might change the speed at which it dropped, and then we compared them to how fast a scrunched up ball of paper dropped and talked about why they were different.
The ball of paper had a smaller surface area and nowhere for the air to catch and push up on the paper as gravity pulled it down. The air went around the paper and didn't provide the air resistance to help it float down. The piece of paper had a lot of surface area for the air to push up on and this created more air resistance and made the paper fall slower.