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is transferred from the object that is doing the work to the object on which the work is done (i.e. carrying a box upstairs)
make work easier by changing the direction of an applied force (i. e. pulling down on blind sring as blinds fold up)
can increase the force by applying a smaller force over a a large distance versus a larger force over a shorter distance
the measure of how much of the work put into a machine is changed into useful output work
first class lever
used to multiply the force and change the direction of the applied force (screwdriver opening a paint can)
second class lever
the resistance froce is located between the effort force and the fulcrum; multiplies force (wheelbarrow)
a modified first class lever that can multiply force and/or change the direction of the applied force; attatched to something that does not move
one end of the rope is fixed and the wheel is free to move; it multiplies force by increasing the distance you pull
block and tackle pulley
a system of pulleys made of fixed and moveable pulleys; can have large mechanical advantages
wheel and axle
a machine made up of two wheels of different sizes that rotate together (doorknoibs, pencil sharpener)
sloping surfaces that reduce the amount of force required to do work by increasing the distance over which the force is applied
inclined plane with one or two sloping sides that change the direction of the effort force (knife, axe, edge of scissors
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