Chapter 1-4
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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| Reference point | the starting point you choose to describe the location, or position, of an object
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| position | an object distance and direction from a reference point
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| motion | movement; process of changing position relative to a reference point.
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| displacement | the difference between the initial position and the final position of an object
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| speed | the distance an object moves divided by the time it takes to move that distance
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| constant speed | the rate of change of position in which the same distance is traveled each second
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| Instantaneous spped | an object's speed at a specific instant in time
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| average speed | the total distance traveled divided by the total time taken to travel that distance
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| velocity | the speed and the direction of a moving object
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| acceleration | a measure of the change in velocity during a period of time
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| contact force | a push or a pull on one object by another object that is touching it
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| force | a push or a pull on an object
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| noncontact force | a force that one object applies to another object without touching it
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| gravity | an attractive force that exists between all objects that have mass
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| mass | the amount of matter in an object
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| weight | the gravitational force exerted on an object
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| fiction | a contact force that resists the sliding motion of two surfaces that are touching
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| net force | the combination of all the forces acting on an object.
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| balanced forces | forces acting on an object that combine and form a net force of zero
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| unbalanced forces | forces acting on an object that combine and form a net force that is not zero
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| newton's first law of motion | law that states that if the net force acting on an object is zero, the motion of the object does not change
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| inertia | the tendency of an object to resist a change in motion
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| newton's second aw of motion | law that states that the acceleration of an object is equal to the net force exerted on the object divided by the object's mass
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| circular motion | any motion in which an object is moving along a curved path.
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| centripetal force | in circular motion, a force that acts perpendicular to the direction of motion, toward the center of the curve.
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| newton's third law of motion | law that states that for every action there is an equal and opposite reaction
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| force pair | the forces two objects apply to each other
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| momentum | a measure of how hard it is to stop a moving object.
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| energy transformation | the conversion of one form of energy to another
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| law of conservation of energy | law that states that energy can be transformed from one form to another, but it cannot be created or destroyed
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| work | the amount of energy used as a force moves an object over a distance
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| simple machine | a machine that does work using one movement
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| inclined plane | a simple machine that consists of a ramp, or a flat, sloped surface
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| screw | a simple machine that consists of an inclined plane wrapped around a cylinder
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| wedge | an inclined plan that moves
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| lever | a simple machine that consists of a bar that pivots, or rotates, around a fixed point
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| wheel and scale | a simple machine that consists of an axle attached to the center of a larger wheel, so that the shaft and wheel rotate together
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| pulley | a simple machine that consists of a grooved wheel with a rope or cable wrapped around it
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| complex machine | two or more simple machines working together
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| efficiency | the ratio of output work to input work
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| sound wave | a longitudinal wave that can travel only through matter
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| pitch | the perception of how high or low a sound is; related to the frequency of a sound wave
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| echo | a reflected sound wave
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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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