Friction is a force that opposes motion.Objects stop moving because of friction.Friction is simply two surfaces acting on each other.
Friction depends on the type of surface an object is on, and the amount of surface area that the friction is acting on.
Can you name some frictions that would oppose motion?
Where did you find that the friction was the highest?
As friction increased what happened to the amount of force it took to move the shoe?
What kind of shoe would have the most friction? The least? Why?
How is friction measured?