In Unit 6, we learned about friction. Friction is a force (push or pull) that opposes motion or impending motion. This kind of force is a contact force which means that it has direct contact between two objects. Friction is an important factor to consider in physics especially with Newton's 3 Laws of Motions. The force of friction can affect the acceleration of an object. For example, with the Inertia Law, saying that an object will stay in motion if in motion or in rest if it's at rest, won't apply so well if friction is involved. A ball can't keep rolling if it's on a surface of sandpaper as easily as it would on slippery ice.
An example of friction, looking at it on bigger terms, would be like the ocean. When your riding a boat, you want to go on a smooth sailing day, while the water is calm and not too bumpy. Therefore, if the water is so smooth, your boat can glide over it easily. If you go when all the waves are out, when its stormy or rough waters, it's very dangerous to go out to sea because with the waters so rough, it can toss your boat and keep it from moving. This would be like the boat going over a surface with friction (rough water), which slows the boat or stops it from moving.
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