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| Question | Answer |
|---|---|
| • Work | occurs when a force causes an object to move in the direction of the force |
| • Work is ONLY done when ………… | you are touching the object and applying the force |
| • These 2 things must be present in order for work to be occurring | force and motion |
| • What is the work formula ? | W equals F times d |
| • Power – include picture(s) the rate at which work is done | |
| • What is the power formula? | P equals W over t |
| • Watt - include picture(s)the unit used to express power | |
| • Machine - include picture(s) | a device that helps make work easier by changing the size or direction of the force |
| • Work Input | the work you do on a machine |
| • Work Output | the work done by a machine |
| • When can work output be GREATER than work input? | work output can never be greater than work input |
| (carefully read last paragraph p. 193) | |
| • “Machines don’t save work” . True or false? Explain your answer | true |
| • Mechanical Advantage | tells you how many times the machine multiplies force |
| • Mechanical Advantage formula | MA equals output force over input force |
| • What are the 6 simple machines ? | lever, fulcrum, inclined plane, wedge, screws, wheel & axel, pulley |
| • Lever | a simple machine consisting of a bar that pivots at a fixed point called a fulcrum |
| • Examples of - include picture(s) | hammer teder todder |
| • Fulcrum | a fixed point |
| • Examples of each of the 3 classes of levers - include picture(s) | weight as in lift, wheel barrel, hammer |
| • Inclined Plane | a straight slanted surface |
| • How do you increase the mechanical advantage of an inclined plane? | the longer the inclined plane is to its height |
| • Examples of Inclined Planes -- include picture(s) | ramp |
| • Wedge | double inclined plane that moves |
| • Examples of Wedges - - include picture(s) | knife, plows and doorstops |
| • Screws | an inclined plane that is wrapped in a spiral |
| • Examples Screws -- include picture(s) | jar head and screws |
| • How do you change the mechanical advantage of a screw? | unwind the screws to make it longer |
| • Wheel & Axle | 2 circular objects of different sizes |
| • Examples of Wheel & Axle -- include picture(s) | doorknob |
| • Pulley | consisting of a grooved wheel that holds a rope or a cable |
| • Examples of Pulleys -- include picture(s) | block and tackle, fixed and movable |
Created by:
PhySciLewis1
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