Homework 12/20

This week we learned more about friction and what a world would be like without it. We did many test to show what it would be like without friction to stop us. One way to see what this is like is to stand on ice where there is little amounts of friction. We showed that with no friction u would not be able to do everyday things. Like opening or closing a door you would be pulled forward when trying to pull open the door and when trying to push it open u would be pushing back. We also learned that when Kathy and Laura pushed on each other when they were both on carts even though Kathy pushed all her force on Laura some force was pushed back from Laura and pushed back Kathy. We learned more about friction and then started learning about gravity like with an apple in the tree. The apple is being pulled to earth by gravity and so for the tree to keep it up the force put on the apple must be the same as the force put on the apple by the earth.