http://. machine- a device that makes work easier by changing the direction or size of the force
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http://www.youtube.com/watch?v=qybUFnY7Y8w
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Machine- a device that makes work easier by changing the direction or size of the force.
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Work- Force move an object in the direction of the Force
Work = Force x Distance
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Work input- Work done on a machine.
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Work output- Work done by the machine.
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Mechanical Advantage (M.A.)- number of times a machine multiplies the force input to it.
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Mechanical Efficiency – Ratio of work output divided by work input.
work outputwork input
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Incline Plane- A straight slanted Surface.
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M.A. of an incline plane-
length of incline divided by the height object is raised
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Screw- an incline plane (straight angled surface) wrapped around a cylinder.
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Wedge- two inclined planes.
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Lever- a bar that pivot around a fixed point.
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Fulcrum- the fixed point in which a lever pivots around.
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Input arm- the distance from the fulcrum to the input force.
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Output arm- the distance from the fulcrum to the output force (load).
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Load- Object being moved.
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Wheel & Axle- 2 circular objects of different sizes
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M.A. of a Wheel & Axle-Radius of the WheelRadius of the axle
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Pulley- grooved wheel with a rope around it.
M.A. of pulley- count the number of rope segments. (-1 if it has a fixed pulley)
fixed
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Compound machine- two or more simple machine working together.
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http://www.youtube.com/watch?v=qybUFnY7Y8w