What are the 4 types of friction?
static-between stationary objects-keeps a book on a desk
sliding-one object slides over another (can cause heat)
a box being pushed across a carpet
rolling-when two objects roll across one another - ballpoint pen on paper, a car on a driveway
fluid friction- when an object moves through a liquid or air (air resistance)
-a fish gliding through water
-a parachute being pulled up by air resistance