# Rotation and Gravitation

1. Feb 23, 2005

### mark9159

You have one screwdriver with a thick handle and one with a thin handle. Which one would be better for opening a stubborn can of paint?

my answer: either screwdriver--they are the same

Which screwdriver would be better for turning a stubborn screw?

my answer: the thick handled screw driver

What force keeps the moon in orbit around the earth?
Choices: a.)centripetal force b.)gravitational force. c)both a and b
my answer: c) both a and b

You turn a corner in your car and slide to the outside edge of the seat. Why does this happen?
my answer: centrifugal force pulls you to the outside.

can someone explain the difference between centripetal and centrifugal forces please?

thank you,

mark

EDIT: one mor question

a coin stays on a turntable because of friction. Part of the friction causes cicular motion. Which direction does the friction point?
Choices: a) foward along the coin's path. b)towards the center of the turntable. c)away from the center of the turntable. d)backward along hte coin's path

my answer:..im not quite sure..could someone explain this to me

Last edited: Feb 23, 2005
2. Feb 24, 2005

### Andrew Mason

Since gravity provides the centripetal acceleration, there is only one force. Gravity. a).