Term
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Definition
| the fulcrum is between the effort and resistance |
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Term
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Definition
| resistance is between the fulcrum and effort |
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Term
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Definition
| effort is between the rulcrum and resistance |
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Term
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Definition
| a rigid bar capable of turning about a fulcrum |
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Term
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Definition
| has a mechanical advantange (MA) of 2 (see diagram in text book pg 324) |
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Term
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Definition
| changes the direction of an effort; mechanical advantage (MA) 1 |
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Term
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Definition
| the amount by which a machiene magnifies effort |
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Term
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Definition
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Term
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Definition
| the amount of power produced by 1J of work in 1s |
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Term
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Definition
| product of force applied on an object multiplied by the distance that the object moved |
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Term
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Definition
| the amount of work done in a given period of time |
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Term
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Definition
| one or two part devices that make work easier |
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Term
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Definition
| the percentage of work input returned as useful output |
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Term
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Definition
| the SI unit of energy; equal to 1 newton-meter of work |
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Term
| 2 conditions that define work |
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Definition
| an unbalnced force applied to an object; motion of the object in the direction of the force |
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Term
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Definition
| lever, wheel and axle, pulley, inclined plane, wedge, screw |
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Term
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Definition
| a modified lever that increases distance; example: a wheel and axle on the bottom of a car - the axle turns the wheels |
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Term
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Definition
| examples: ramps, stairs; can look like this ---> / |
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Term
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Definition
| 2 inclined planes placed bottom to bottom |
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Term
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Definition
| an inclined plane wrapped around a cylinder or cone |
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Term
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Definition
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Term
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Definition
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Term
| formula for mechanical advantage (MA) |
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Definition
| ratio of the output force/the input force (MA=output/input) |
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Term
| examples of first class levers |
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Definition
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Term
| examples of second class levers |
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Definition
| nut cracker, door hinge, wheelbarrow |
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Term
| examples of third class levers |
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Definition
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Term
| Do simple machines save us work? |
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Definition
| yes because they decrease the amount of force, power, and time needed to do the job |
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Term
| What is the fulcrum of a wheel and axle? |
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Definition
| sprocket, chain, and bike pedals |
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Term
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Definition
| any reduction in the effort force that is required will be "paid" for by an increased distance through which that force must act |
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Term
| How does a lever make work easier? |
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Definition
| less effort is needed to move an object |
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Term
| How does friction reduce the efficiency of a machine? |
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Definition
| friction works against motion |
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Term
| Does a fixed pulley multiply force, distance, or neither? |
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Definition
| neither because the effort arm and the resistance arm are the same length |
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Term
| What would a fixed pulley be used for? |
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Definition
| changing the direction of an effort, giving a physical advantage |
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Term
| If the pith on a screw is small, does that indicate a high or low mechanical advantage? |
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Definition
| high; small=high and large=low |
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Term
| What would be the efficiency of an "ideal" machine? |
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Definition
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Term
| what did you learn questions pg 334 |
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Definition
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Term
| simple machine labs and worksheets |
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Definition
| review and look over the bold faced words |
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