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a device that changes the amount of force exerted or the direction in which force is exerted
the number of times the force exerted on a machine is multiplied by the machine
a simple machine consisting of a device that is thick at one end and tapers to a thin edge at the other
a simple machine that consists of an inclined plane wrapped around a central cylinder to form a spiral
wheel and axle
a simple machine consisting of two circular objects that are fastened together and rotate about a common axis
a simple machine consisting of a grooved wheel around which is wrapped a rope, chain, or cable
The Force-Distance Trade-off
Machines often will increase the distance of the object has to move, but the input effort force is decreased. The same amount of work is done.
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
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