lesson
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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| there area total of three types of simple machines. | false
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| a lever consists of a bar that pivots about a fixed point called the focus. | false
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| a wedge is a sloped surface that forces materials apart. | true
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| which factors determine whether a lever is a first- class lever, second-class lever, or third-class lever? | input force, output force, fulcrum
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| what is a compound machine? | two or more simple machines that operate together and form a compound machine.
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| how do you calculate the overall efficiency of a compound machine? | multiply the efficiencies of each simple machine together.
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| an example of a wedge | your front teeth
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| an example of a screw | bottle caps
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| an example of an inclined plane | ramp
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| flag pole | pulley
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| wedge that splits wood | wedge
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| roller skates | wheel and axle
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| a lever's pivot point | fulcrum
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| a shaft that turns | axle
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| a wheelbarrow | second-class lever
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| what is a compound machine? | when two or more simple machines that operate together to form a compound machine.
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| how is the efficiency of a compound machine calculated? | by multiplying the efficiencies of each simple machine.
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| what happens to the efficiency of the overall machine as more simple machines are added to it? | each simple machine decreases the overall efficiency.
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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.
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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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Created by:
royerbre4038
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