the two types...I know one is rolling the other is??? and what is it?
2007-02-14 08:54:11 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
I generally classify friction into kinetic and static.
Kinetic friction is the friction of two surfaces sliding over each other.
Static friction is when two surfaces are in contact, but not sliding. When you drive, for instance, your wheels don't slide on the road, so static friction is what propels you. A book on an inclined desk at rest is held by static friction. If you give it a nudge and it slides, then the friction is kinetic.
Generally static friction is greater than kinetic friction, which is why it's better to not spin out or slide when starting and stopping.
2007-02-14 09:03:06 · answer #1 · answered by Thomas G 3 · 0⤊ 0⤋
There are more than two types according to the physics book that I'm looking at, but here they are.
1.) Rolling (You got that one)
2.) Static (The kind that prevents you from getting something moving right away when you push it)
3.) Kinetic (The kind that is caused by motion).
Not sure which ones you were looking for, but hopefully one of them will ring a bell.
2007-02-14 17:06:19 · answer #2 · answered by Archangeleon 3 · 0⤊ 0⤋
The other is sliding friction. But both of them have moving (kinetic) coefficients and static (not-moving) coefficients that change as the mass translates from not-moving to moving.
HTH âº
Doug
2007-02-14 17:02:07 · answer #3 · answered by doug_donaghue 7 · 0⤊ 0⤋