Is it useful or a nuisance?

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Presentation transcript:

Is it useful or a nuisance? FRICTION What is it? Is it useful or a nuisance?

What is friction? Friction is a force that opposes (tries to stop) movement It can makes things that rub together get hot , slow down and wear out So it can be a nuisance! But without it we couldn’t walk across the floor and cars couldn’t move on the road So it is useful too!

Friction is a force that resists the movement of an object Friction is a force that resists the movement of an object. It acts in the opposite direction to the object’s motion. pull friction The force you need to just start the object moving is equal to the STATIC FRICTION between the object and the ground. Once the object is moving you need a smaller force to keep it moving - this is called the DYNAMIC (or KINETIC) FRICTION between the object and the ground.

Is friction useful or a nuisance in these cases? skiing downhill striking a match useful tying knots in a rope useful walking along the ground useful starting a car engine nuisance putting on the brakes on a bike useful