Motion Ch. 1.1 An Object in Motion changes position, 1.2 – Flashcards
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Position
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The location of a place or object
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Reference Point
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A location to which you compare other locations.
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Longitude
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How many degrees east or west of the prime meridian
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Longitude
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How many degrees east or west of the prime meridian
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Latitude
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How many degrees north or south of the equator.
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Prime Meridian
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An imaginary line running north-south through Greenwich, England
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Equator
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The imaginary line that divides the northern and southern hemispheres.
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Scientific measurements
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Meter-Standard Unit of Length
Kilometer(measures long distances)
Centimeter and millimeter(measures small distances)
Kilometer(measures long distances)
Centimeter and millimeter(measures small distances)
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Motion
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The change of position over time.
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Relative Motion
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Motion of an object as observed from a certain point.
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Speed
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How fast something moves or the distance is moves, in a given amount of time.
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Rate
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the way in which one quantity changes compared to another quantity. Speed is the rate at which distance changes compared to time.
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Equation to calculate speed
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Speed= distance/time S=d/t meters/second (m/s)
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Average Speed
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Total distance/total time
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Velocity
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The speed in a specific direction. Velocity is a vector.
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Vector
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A quantity the has both size and direction.
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How does velocity compare to speed?
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Two objects can have the same speed but different velocities, they could be going in different directions.
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Average Velocity
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Total distance from where you started/time.
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What is your average velocity if you begin and end at the same place?
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Zero km/hr
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How would decreasing the time it takes you to run a certain distance affect your speed?
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You would be running at a faster speed.
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What two things do you need to know to describe the velocity of an object?
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Speed and direction. How fast its travelling and in what direction.
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constant speed
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When the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed
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instantaneous speed
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moment to moment speed
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acceleration
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The rate at which velocity changes with time.
