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32 Cards in this Set
- Front
- Back
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Do machines change the amount of work that must be done?
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No
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If a machine makes work easier, how is it "paid for"?
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By increased distance that effort force must be applied
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Why would anyone want to make work harder?
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To get the work done faster
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If work is easy, then the job will probably get done ___. If it's hard, then it will get done ____.
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slowly; quickly
(Slow n easy or hard n fast) |
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Mechanical Advantage is the number of times that ....
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work is made easier
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If mechanical advantage is 4, then work is ___ times easier.
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four
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If mechanical advantage is 0.25, the work is ____ times easier. Is it easier?
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0.25.... which means that work is 4 times harder
No. |
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A bike in a high gear is __ to pedal, yet the bike goes ___. So mechanical advantage is ___.
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hard
fast low |
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A jack lifting a car makes work ___, but you have to turn the crank ___ times to make the car rise only a little. So the mechanical is _____
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easy
many high |
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A pivot point is called a ....
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fulcrum
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Three simple machines have pivot points. They are the ___, ___, and ____
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lever
pulley wheel & axle |
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Three simple machines have ramps of some sort. They are the ___, ___, & ____
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Inclined plane
Wedge Screw |
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Which simple machine is a circular inclined plane?
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screw
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Which simple machine is a ramp?
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Inclined plane
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Which simple machine is a double inclined plane?
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wedge
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Which simple machine typically has cutting edges?
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Wedges.
"Wedges have edges!" |
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Which simple machine is a grooved wheel with a rope in the groove?
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pulley
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Which simple machine has a rigid arm with a pivot point?
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lever
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Which simple machine has a large wheel connected to a small wheel
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Wheel & axle
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A propeller or fan blade is an example of which simple machine?
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screw
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Ideal mechanical advantage is found by using d______
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distances
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Actual mechanical advantage is found by using f_____
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forces
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Actual mechanical advantage takes ____ into consideration whereas IMA does not
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friction
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IMA is always ____ than AMA
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greater
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The IMA of a pulley system is found easily by counting the...
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number of supporting strands
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A pulley or lever with a MA equal to one merely serves as a ___ ____ because it makes work neither ____ nor _____
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direction changer
easy nor hard |
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What's the IMA of a 20 meter ramp that's used to raise an object a height of 2 meters?
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10
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What's the meaning of a MA of 2?
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Work is twice as easy, but takes twice the distance.
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What is it telling you if a machine has a MA of 0.5?
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Work is twice as hard, but will get done twice as fast.
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What is the mnemonic device that will help you remember the classes of levers?
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EFR
FRE FER |
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Which has a higher MA, a fat axe or a thin long axe?
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Thin long axe
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Which one will get wood split faster, a fat axe or a thin long axe?
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fat axe
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