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Sliding friction is when there's less friction and the two surfaces glide over each other. It's how people do skiing and snowboarding.

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Is when a ball or a wheel is moving and this is rolling friction. And the force is resisting the motion when the body like a ball or wheel is rolling on a wheel.

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Fluid friction is similar to air resistance skydivers experience. The friction is caused by a solid moving through a gas or fluid.

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Static friction is a type of force that keeps its object at rest. To start moving the object is has to be overcome with force to start moving. Once the object is moving it experiences kinetic friction.

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1. Friction
2. This stops friction and the breaks will not work.
3. Because the molecules are rubbing together.

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-Bike tyres come in different shapes and sizes.
-Road tyres are smooth and thin-this reduces friction and makes the tyre move faster.

Mountain bike tyres are rougher this increases friction and that allows the bike to climb and go fast.

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-Oils and lubricant on metal parts help to:
-reduce the amount of friction by allowing the parts to slide smoothly.
-Absorb some of the heat produced by friction and speed around it.

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-When two surfaces rub on each other, the resulting friction causes the surface molecules to vibrate. this causes heat.

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First Example- The chain and sprocket connect to each other when pedalling.
Second Example- When the break and wheel touch and cause the wheel to stop moving.
Third Example- Is when your butt is on the seat and if you wear silky pants you can slip easier and with normal pants it is harder to fall of due to friction.

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-In machines, friction occurs where two surfaces slide or roll on each other.
-Some parts of a machine are designed to overcome friction. eg-wheels, balls bearings.
-Some machines use oil to lesson friction.

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-Friction is a face of resistance to the motion of an object.
-Friction happens when two surfaces touch each other.

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Levers are the simplest of all machines.
- a lever is a rigid bar that rotates about a point
- all levers have 3 main points:
-the place where effort is applied (e)
- the fixed point the lever rotates from called the pivot or fulcrum (p)
-the place where the thing that is moved is located. (L)

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Levers are things when a log is placed on the ground and a flat log on top and one heavy things on one side and then force is applied on the other side.