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Published byArnold Dalton Modified over 5 years ago

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Do Now 1/31 Yesterday you calculated speed in the bubble gum lab, explain in words what speed is a measure of

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Speed and Velocity 11.2

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Speed Put in order of fastest to slowest Grass growing, leaf falling, car driving, bird flying

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Speed Car, bird, leaf, grass The differences among these types of motion can be described in terms of speed Speed is the ratio of the distance an object moves to the amount of time the object moves SI unit is meters per second (m/s)

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Two ways to express speed Average speed- is computed for the entire duration of a trip Tells how fast something moves for an entire trip Ex: hiker in the mountains Average speed = total distance total time total time v = d t

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Instantaneous speed (v)- measured at a particular instant A car’s speedometer gives instantaneous speed

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Graphing Motion A distance-time graph is a good way to describe motion The slope of the line on a distance time graph is the speed of the object traveling Slope is rise/run y 2 -y 1 x 2 -x 1 x 2 -x 1

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Velocity The speed and direction that an object is traveling is its velocity Velocity is a vector and velocities can be combined using vector addition

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Try It An Olympic swimmer swims 50.0meters in 23.1 seconds. What is his average speed? A plane’s average speed is 600km/h. If the trip takes 2.5 hours, how far does the plane fly? (hint: change the average speed formula around to solve for d)

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