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Chapter 8 Terms AE
Airik Evans
| Question | Answer |
|---|---|
| • Work | when a force causes an object to move in the direction of the force |
| • Work is ONLY done when ………… | the object is moving in the direction of the force |
| • These 2 things must be present in order for work to be occurring | the object moves as a force is applied/the direction of the objects motion is the same as the direction of the force applied |
| • What is the work formula ? | W=F X D |
| • Power – include picture(s) | the rate at which work is done |
| • What is the power formula? | P=W/T |
| • Watt - include picture(s) | Joules per second |
| • Machine - include picture(s) | a device that helps make work easier by changing the size or direction of a force |
| • Work Input | The work you do on a machine |
| • Work Output | The work done by the machine |
| • When can work output be GREATER than work input? | Never |
| • “Machines don’t save work” . True or false? Explain your answer | True because at machine just makes work easier even though the same amount of work is involved |
| • Mechanical Advantage | tells how many times the machine multiplies force |
| • Mechanical Advantage formula | MA=500N/50N=10 |
| • What are the 6 simple machines ? | Lever, inclined plane, wedge, screw, wheel and axle, pulley |
| • Lever | a simple machine consisting of a bar that pivots at a fixed point |
| • Examples of - include picture(s) | Hammer, See-saw |
| • Fulcrum | The fixed point on a lever |
| • Examples of each of the 3 classes of levers - include picture(s) | See-saw, Wheel-Barrow, Hammer |
| • Inclined Plane | a simple machine that is a straight slanted surface |
| • How do you increase the mechanical advantage of an inclined plane? | The longer the inclined plane is to the height |
| • Examples of Inclined Planes -- include picture(s) | Ramp |
| • Wedge | A double inclined plane that moves |
| • Examples of Wedges - - include picture(s) | Knife, Doorstops, plows, axe heads, and chisels |
| • Screws | an inclined plane that is wrapped in a spiral |
| • Examples Screws -- include picture(s) | screws |
| • How do you change the mechanical advantage of a screw? | The longer the spiral and the closer the threads |
| • Wheel & Axle | a simple machine consisting of two circular objects of different sizes |
| • Examples of Wheel & Axle -- include picture(s) | Doorknobs, wrenches, Ferris wheels, screwdrivers, and steering wheels |
| • Pulley | a simple machine consisting of a grooved wheel that holds a rope or cable |
| • Examples of Pulleys -- include picture(s) | Elevators, Crane |
Created by:
PhySciLewis1
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