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9U3C4

TermDefinition
work The action that results when a force causes an object to move in the direction of the force
power the rate at which work is done
machine a device that helps make work easier by changing the size or direction (or both) of a force
Work input The work you do on a machine
Work output The work done by the machine
Mechanical advantage a number that tells how many times a machine multiplies force (no units)
Mechanical Efficiency is a comparison of a machine's work output with the work input (expressed as a percentage)
Simple machine the six machines from which all other machines are constructed
Compound machine a machine that is made of two or more simple machines
levers a simple machine consisting of a bar that pivots at a fixed point
First-class The fulcrum is somewhere in the middle, and the load and effort are on each side of the fulcrum
Second-class The fulcrum is to one side, the load is in the middle, and the effort is on the other side
Third-class The fulcrum is to one side, the effort is in the middle, and the load is on the other side
Inclined planes reduces the amount of effort required by increasing the work's distance
wedges a moveable inclined plane and it reduces the amount of work required to split or lift objects
screws a wedge (an inclined plane) wrapped around a shaft or post
Wheel and axel a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
pulleys a simple machine consisting of a grooved wheel that holds a rope or a cable
work formula force X distance
joules units of work
work/time power formula
watts unit for power
mechanical advantage formula force output/force input
mechanical efficiency formula work output/work input X 100
Created by: Ms. Greenup
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