How does a roller coaster move when you are going up?
Slowly
What pulls you down the hill?
Gravity
How do you feel when you go quickly in the circle (the loop the loop)?
Heavy
Gravity pulls you...
down
How are you hanging when you reach the top of the loop?
Upside down
What force stops you from falling down when you are upside down in the loop?
the centripetal force
What does the centripetal force do?
It keeps you moving in a circle
What force does the roller coaster use to stop?
Friction
What force makes you to continue moving?
inertia
How do some people feel in roller coasters because of the changing forces?
Dizzy or sick
Who invented roller coasters?
The Russians
