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Transcript of Foldable Directions FrontInsideBack PULLEY INCLINED PLANE 3 Examples of Pulley with pictures 3...
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Foldable Directions
Front Inside Back
PULLEY
INCLINED PLANE
3 Examples of Pulley
with pictures
3 Examples of Incline
Planes with pictures
Definition of Pulley
List the 3 different types of pulleys
Definition of Inclined Plane
SIMPLE MACHINES
1. What are they
2. Why we use them
3. List the 6 simple machines
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Thursday, 1/16/14
1.Get out a sheet of paper2. Title it Simple Machines3. Sit quietly
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What is a Simple Machine? A simple machine is a
machine that has few or no moving parts.
Simple machines make work easier by changing the direction or amount of force needed to do work. Write the 6 examples
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Wheels and Axles The wheel and axle
are a simple machine
The axle is a rod that goes through the wheel which allows the wheel to turn
Gears are a form of wheels and axles
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Pulleys Pulleys are wheels
and axles with a groove around the outside
A pulley needs a rope, chain or belt around the groove to make it do work
3 types of pulleys: Fixed Movable Pulley systems
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Fixed Pulley
• A fixed pulley is attached to a structure.
• It allows a change in direction of the input force
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Movable Pulley
• Attached to the object you are trying to move
• It multiplies your force
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Pulley System
• Combine a fixed and movable pulley
• Block and tackle
• Increases mechanical advantage
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Pulley examples
Clothesline pulley
Flagpole pulley
Window blinds pulley
Can you think of any other examples?
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Inclined Planes An inclined plane is
a flat surface that is higher on one end
Inclined planes make the work of moving things easier
Can you think of any other examples?
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Inclined Plane Examples
Truck RampPlayground Slide
Wheelchair Ramp
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Wedges Two inclined
planes joined back to back.
Wedges are used to split things.
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Screws A screw is an
inclined plane wrapped around a shaft or cylinder.
The inclined plane allows the screw to move itself when rotated.
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Levers-First Class In a first class lever
the fulcrum is in the middle and the load and effort is on either side
Think of a see-saw
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Levers-Second Class In a second class
lever the fulcrum is at the end, with the load in the middle
Think of a wheelbarrow
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Levers-Third Class In a third class lever
the fulcrum is again at the end, but the effort is in the middle
Think of a pair of tweezers
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Simple Machines Simple Machines
can be put together in different ways to make complex machinery