# Marble / Wheel Game Physics - Kinetic vs Static Friction?

I've read a bit about the "normal force" modeling of friction here. I gather that it isn't a full picture, but a decent approximation, if it fits the needs of what you are trying to model.

It mentions that there's a static friction and a kinetic friction where the static friction is the amount of force that needs to be overcome before an object will begin moving, and then the kinetic friction specifies how much force you need to apply to keep the object moving.

For the case of a ball rolling or a wheel spinning, I know that a little bit of force will cause it to roll, while applying a lot of force will cause it to "slip" and lose contact / friction with the ground and start spinning.

In this case, is it the static friction that determines how much force you can apply to a wheel or a ball before it starts to slip, and then it's the kinetic friction that determines how it acts when it is slipping?

• Rolling resistance determines how much force is needed to keep it rolling at the same speed. Commented Jan 11, 2017 at 9:16