grade 3/4
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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| What is effort? | The work needed to move a load
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| What is force? | A push or a pull on something to move it
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| What is a spring scale used for? | To measure the effort needed to lift a load in newtons
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| What kind of pulley is attached to a structure? | A fixed pulley
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| What is a problem with a fixed pulley? | You are lifting the whole weight of the load
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| What is the load attached to in a movable pulley? | The load is attached to the pulley
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| What is a problem with a movable pulley? | You have to pull up to lift the load
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| What pulley system lets you pull down on the rope and cuts the weight of the load in half? | Combined pulley
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| How do you find the mechanical advantage of a pulley system? | You count the number of supporting ropes
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| What two pulley systems cut the weight of the load in half? | Combined pulley and movable pulley
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| If the gear you turn goes clockwise, what direction does the second gear go? | Counterclockwise
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| What direction does the effort force go in a fixed pulley? | Pull down
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| What direction does the third gear in a gear train go if the first gear turns clockwise? | Clockwise
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| If the gear you are turning is large, and the second gear is small, which gear turn faster? | The small second gear
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| If the large gear has 20 teeth, and the small gear has 10 teeth, how many times will the small gear turn when the large gear turns once? | Two times
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| If the gear you are turning is large and the second gear is medium, which gear turns slower? | The large first gear
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| What is the name of gears that work on a flat surface? | Spur gears
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| What is the name of gears when one is flat and the other is upright? | Bevel gears
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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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Created by:
libraryb
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