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9U3C4
Term | Definition |
---|---|
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 |