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- Force is when you put pressure on someone or something.
- Levers is something you use to help lift something or shift something.

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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 three main points:
1. The place where effort is applied.
2. The fixed point where the lever rotates from is called the pivot.
3. The place where the thing that is moved is located.

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In a Class One Lever, the Fulcrum is located between the Load and the Force. The closer the Load is to the Fulcrum, the easier it is to lift (increased mechanical advantage). Examples include see-saws, crow bars, hammer claws, scissors, pliers, and boat oars.

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In a Class Two Lever, the Load is between the Force and the Fulcrum. The closer the Load is to the Fulcrum, the easier the load is to lift. Examples include wheelbarrows, staplers, bottle openers, nut cracker, and nail clippers.

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In a Class Three Lever, the Force is between the Load and the Fulcrum. If the Force is closer to the Load, it would be easier to lift and a mechanical advantage. Examples are shovels, fishing rods, human arms and legs, tweezers, and ice tongs.

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

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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, Ball Bearings.
- Some machines use oil to reduce friction.

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1. Where the chain rubs against the sprocket.
2. When the brakes push on the wheel rims.
3. When you grip your hands the the handles.

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Tearing two interlaced phone books apart using two 18 wheeler trucks

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

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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 go faster.
- Mountain bike tyres are big and bulky.  This increases friction and that allows the bike to stick to the ground.

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1.  When two surfaces rub what is created?  Heat is created.
2.  What would happen if you put oil on the break pads of a bike? If you put oil on break pads of a bike it will lessen friction and won't break.
3.  Why is heat caused when two surfaces rub on each other?  Heat is caused when two surfaces rub on each other because the molecules vibrate and shoot up to the surface.

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Science Reflection Doc		  This is a quick reflection and a few questions to answer on some of the recent science topics you have focused on.  Use the Padlet you have been developing to assist with this task.   What knowledge do you now have about Levers/Friction that you didn’t know before? (...