ch. 5 work and simple machines

Created by kfharper 

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work

transfer of energy when a force moves an object

mechanical advantage

a machine multiplies an input force

friction

causes some of the energy transferred to an object to be converted into thermal energy

ways to make machines work easier

1. increasing the force
2. change the direction of the applied force
increasing the distance over which the force is applied

2 things need for work to be done

1. move the object
2. object must move in the that direction which you move it in

efficiency

work output of a machine divided by the work input

output work

work doen by the machine

output force

the force applied by the machine

input force

the force you apply to a simple machine

input work

work done by you on the machine

mechanical advantage

ratio of input force to output force (tells you how much better the machine is over you)

third class lever

the input force is applied between the output force and the fulcrum

moveable pulley

a pulley with one fixed end and the wheel is free to move

wedge

inclined palne with two sloping sides

block and tackle pulley

a system of pulleys consisting of fixed and moveable pulleys

fixed pulley

pulley that only changes the direction of the applied force

second class lever

output force is located between the input force and the fulcrum

wheel and axle

simple machine consisting of a shaft attached to the center of a larger wheel

first class lever

fulcrum is located between the input and output forces

screw

an inclined plane wrapped around a cylindrical post

inclined plane

a sloping surface such as a ramp

you have not done any work if

you do not move the object

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