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24 Cards in this Set
- Front
- Back
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the distance and direction of the objects change in position.
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displacement
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what kind of quantity is distance and what does it not include?
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scaler quantity; direction
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what kind of quantity is displacement and what does it not/does it include
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vector; it includes everything including direction
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what do you need to know in order to describe how an object is moving?
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how far it travels in a given time
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what is the distance an object travels per unit of time? distance equals..
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speed. d= speed/time
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any change over time is called a ___
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rate
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____ is the rate at which distance is traveled.
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speed
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when is an object traveling at constant speed?
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when it neither speeds up or slows down
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is speed usually constant?
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no
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___ is the total distance traveled divided by the total time traveled.
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average speed. as=d/t
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when something is speeding up or slowing down, its ____ speed is changing.
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instantaneous
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the motion of an object over a period of time can be shows on a _____
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distance-time graph
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what axis is time plotted on? distance?
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s= horizontal. distance= vertical
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the slope on a distance time graph gives you what?
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speed of an object
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what is the change in position (displacement) per unit of time
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velocity
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velocity m/s equals...
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change in displacement(m)/ change in time(s)
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velocity includes the __ & __ of an object.
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speed and direction of motion
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____ is the rate of change of velocity
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acceleration
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if the acceleration is in the same direction as the velocity, the speed ____
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increases
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if the speed decreases,the ____ is in the opposite direction from velocity
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acceleration
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when an object changes direction, its ___ changes
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velocity
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if the velocity is positive, positive acceleration will increase the objects ___
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velocity
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if the velocity is negative, positive acceletation will ___ the objects velocity
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decrease
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positive speed or velocity vs. time is __
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slope
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