motion
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| the background or object that is used for to describe the motion of a body | frame of reference
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| the most common frame of reference | earth
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| a change in position in a certain amount of time | motion
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| rate at which an object moves ---distance traveled/time of travel | speed
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| unit for measuring speed | meter(s) per second
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| speed of a body does not change | constant speed
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| displacement/time | average velocity
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| the speed of a body and the direction it travels | velocity
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| velocities that are in the same direction are combined by | adding them
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| velocities that are in the opposite direction are combined by | subtract the small from the large velocity
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| the change in velocity of a body or a change in direction | acceleration
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| change in velocity divided by the time during which this change occurs | acceleration
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| a decrease in velocity is | negative acceleration
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| an increase in velocity is | positive acceleration
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| negative acceleration is known as | deceleration
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| An object is __________________if its position reltive to a fixed point is changing. | moving
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| How fast an object is moving | speed
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| Formula for average speed is | total distance / time interval
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| The speed of an object at a given moment in time | instantaneous speed
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| How fast an object is moving and the direction of travel | velocity
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| Velocity of an object does not change over time | constant velocity
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| The rate at which velocity is changing | acceleration
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| acceleration formula | change in velocity / time interval
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| An object moving under the influence of gravity alone is called | free fall
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| The acceleration of an object in free fall is about | 10 meters per second squared
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| The formula for finding the weight of an object is | mass times acceleration due to gravity
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| For each second of free fall, an object falls a _____________________ distance than it did in the previous second | greater distance
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| On a speed -versus- time graph the slope represents speed per time, or __________ | acceleration
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| Air resistance noticeably ___________ the motion of things with large surface area. | slows
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| meters per second squared | unit for acceleration
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