Science Explosion v4, chapter 9
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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| acceleration | The change in velocity during a period of time.
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| block and tackle | An arrangement of fixed and movable pulleys connected by ropes.
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| compound machine | A machine that combines two or more simple machines.
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| distance | The amount of space traveled from where an object starts to where it is at any given moment.
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| effort force | The force applied to a simple machine.
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| fixed pulley | A type of pulley that is attached to something so that the pulley does not move; it changes the direction of a force.
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| friction | A force that keeps objects from moving.
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| fulcrum | The fixed point on which a lever turns.
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| gravity | The pull of one object on another.
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| inclined plane | A simple machine consisting of a flat, slanted surface, such as a ramp.
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| inertia | The resistance to a change in motion.
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| joule | The unit used to measure work; equal to one newton meter of work.
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| lever | A simple machine consisting of any bar that turns on a fulcrum.
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| mechanical advantage | The ability to get something moving
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| mechanical energy | The decrease in effort needed to move an object.
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| momentum | The mass and velocity (speed and direction) of an object.
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| motion | Change of an object's position
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| moveable pulley | A type of pulley that moves along a rope where the effort is above the pulley.
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| newton | The unit used to measure force (weight).
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| pulley | Simple machine consisting of a wheel with a chain or rope wrapped in the groove of the wheel.
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| reference point | A fixed, unmoving object needed to determine whether another object has changed position
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| screw | A simple machine consisting of an inclined plane that is wound around a cylinder or cone.
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| speed | The rate at which an object travels; determined by dividing the distance by the amount of time the object takes to travel that distance
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| velocity | The distance an object moves over a given amount of time in a certain direction.
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| wedge | A simple machine consisting of two inclined planes back-to-back.
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| wheel and axle | A simple machine consisting of a wheel and a rod running through the axle.
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| work | A force acting on something and moving it a distance.
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| Resistance force | The force that works against the effort
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| Machine | Any object that makes work easier
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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:
marchscience
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