SIMPLE MACHINES TEST-11/11/14
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| fixed point that a lever pivots around- | fulcrum
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| machine that utilizes two or more simple machines | compound machine
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| rate at which works done | power
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| a device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which force is exerted | machine
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| made of a grooved wheel, with a rope or cable rapped aroun fit | pulley
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| flat sloped surface | inclined plane
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| of 2 circular objects fastened together that rotate a common axle | wheel/axle
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| thick at one end tapers to be thin at the other en | wedge
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| rigid bar that is free to pivot on a fixed point | lever
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| an inclined plane wrapped around a cylinder | screw
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| example of an inclined plane is a | ramp
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| wheel and axl example- | bicycle
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| example of a wedge | axe
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| example of a lever | seesaw
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| example of a screw | twisting a cap off
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| water molecule is- | H2O
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| baking soda- | NaHCO3
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| salt- | NaCI
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| carbon dioxide- | CO2
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| H2O2 | peroxide
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| CO | carbon monoxide
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| CH4 | methane
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| Fe2O3 | rust
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| O3 | ozone
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| C6H12O6- | glucose
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| describe the advantages and disadvantages on an inclined plane | its easier to push things down than it is up… less force for moving objects down and greater force for moving objects up
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| How does the length around the threads of a screw compare to an inclined plane | an inclined plane wrapped around a cylinder
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| write a statement for the relationship between work,force, and direction | work increases as the force and direction increases
force= work times distance
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| what are the units for work | joule
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| what is a machines ideal mechanical advantage | 100%
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| Describe the lab with the levers9ruler, shapes,and penny0 | we used the rulers, shoes and pennies to create and inclined plane
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| what is the pivot point of a lever | fulcrum
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| there has to be less ---- force, than there is input force | output
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| work = | force times distance
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| percentage of input work that is converted into output work | efficiency
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| example of a wheel/ axle | screwdriver
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| unit measured in work | joule
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| what are the three types of pulleys | fixed, movable, and fixed and movable
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| what type of pulley does the input and output work go the same way | movable
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| example of a wedge | zipper
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| how many types of levers | 3
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| paint opener would be what kind of lever | 1st
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| wheel barrow would be what type of lever | 2nd
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| sweeping would be what type of lever | 3rd
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| a type of lever that you push down and it goes up | 1st
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| a type of lever that all the force is in the middle | 3rd
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| a type of lever that you push up and it goes up | second
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| Why is output work always less than input work in real situation? | some work is wasted overcoming the force of friction and gravity
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Created by:
ewoodham
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