Chapter 20
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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| work | the transfer of energy to an object by using a force that causes the object to move in the direction of the force W=F*d
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| joule | unit of work
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| power | the rate at which work is done or energy is transformed
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| watt | power unit
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| machine | a device that helps do work by either overcoming a force or changing the direction of the applied force
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| work input | the work done on a machine
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| work output | the work done by a machine
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| mechanical advantage | a number that tells how many times a machine multiplies force MA= output force/input force
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| mechanical efficiency | ratio of work output to work input
ME= work output/work input
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| lever | a simple machine that consists of a bar that pivots at a fixed point called a fulcrum
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| pulley | a simple machine that consists of a wheel over a rope, chain, or wire passes
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| wheel and axle | a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
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| inclined plane | a simple machine that is straight, slanted surface,which facilitates the raising loads; ramps
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| wedge | a simple machine that is made up of two inclined planes and that moves; often used for cutting
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| screw | a simple machine consists of an inclined plane that is wrapped around a cylinder
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| compound machine | a machine made of more than one simple machine
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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