Maria notices that when she opens the window, her papers blow around the room.
How does that happen?
What is air?
How do you know whether it’s just empty space? Give some evidence from everyday life?
Build a fan that can make a breeze to blow over a paper tower.
Program your fan to make a breeze, starting with the speed set to 100%.
Use your model to try to blow over the paper tower.
Try different positions for the paper tower, like in front of the fan, on one side of it, and closer or farther away.
Does the position change how well the fan works to blow over the tower?
Use your model to explain how your fan can move air particles.
Use your model to explain how your fan can blow over a paper tower without touching it.
Use cardboard or other materials to design a better fan blade, and then test again to see what happens.