http://. machine- a device that makes work easier by changing the direction or size of the force

http://www.youtube.com/watch?v=qybUFnY7Y8w

Machine- a device that makes work easier by changing the direction or size of the force.

Work- Force move an object in the direction of the Force

Work = Force x Distance

Work input- Work done on a machine.

Work output- Work done by the machine.

Mechanical Advantage (M.A.)- number of times a machine multiplies the force input to it.

Mechanical Efficiency – Ratio of work output divided by work input.

work outputwork input

Incline Plane- A straight slanted Surface.

M.A. of an incline plane-

length of incline divided by the height object is raised

Screw- an incline plane (straight angled surface) wrapped around a cylinder.

Wedge- two inclined planes.

Lever- a bar that pivot around a fixed point.

Fulcrum- the fixed point in which a lever pivots around.

Input arm- the distance from the fulcrum to the input force.

Output arm- the distance from the fulcrum to the output force (load).

Load- Object being moved.

Wheel & Axle- 2 circular objects of different sizes

M.A. of a Wheel & Axle-Radius of the WheelRadius of the axle

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

Compound machine- two or more simple machine working together.

http://www.youtube.com/watch?v=qybUFnY7Y8w