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Causes of frictionSurfaces have tiny hills and valleys on both sides.
As the surfaces slide across each other the hills and valleys grind against each other.
Causes of frictionFriction depends on both surfaces.
http://news.discovery.com/adventure/videos/science-friction-all-about-the-physics-of-curling-video.htm
Types of FrictionStatic friction - friction force that resists motion between surfaces that are not moving.
Types of FrictionSliding friction - the friction force that resists the motion of an object moving across a surface.
Types of Frictionair friction - a force of the surrounding fluid (air) working against motion
Effect of weight on frictionAdding weight to a sliding or rolling object adds friction between the two surfaces.
Which takes more force to push?
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