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Calculating Velocity Honors Physics
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Speed Speed is a scalar quantity that refers to "how fast an object is moving.β Speed can be thought of as the rate at which an object covers distance.
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Velocity Velocity is a vector quantity that refers to "the rate at which an object changes its position." Velocity is a vector quantity. As such, velocity is direction aware.
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Velocity (cont.) When evaluating the velocity of an object, one must keep track of direction. It would not be enough to say that an object has a velocity of 55 mi/hr. One must include direction information in order to fully describe the velocity of the object.
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Calculating Average Speed
ππ£πππππ π ππππ= πππ π‘ππππ π‘πππ£ππππ π‘πππ
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How far did the skier travel in each leg of his journey?
Average speed example How far did the skier travel in each leg of his journey?
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Average speed example Leg A to B ο 180 m Leg B to C ο 140 m
Leg C to D ο 100 m Total distance traveled ο 420 m Total time taken ο 3 min ππ£πππππ π ππππ= πππ π‘ππππ π‘πππ£ππππ π‘πππ = 420 π 3 πππ =140 π/πππ
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Calculating average velocity
ππ£πππππ π£ππππππ‘π¦= π π β π π π‘ π β π‘ π
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Average velocity example
Total displacement ο 140 m to the right Total time taken ο 3 min ππ£πππππ π£ππππππ‘π¦= π π β π π π‘ π β π‘ π = 140 π 3 πππ =46.7 π/ min π‘π π‘βπ πππβπ‘!
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Do this one with your table Group (LS)
The physics teacher walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. The entire motion lasted for 24 seconds. Determine the average speed and the average velocity.
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Do this one with by yourself (LS)
Calculate both the average speed and the average velocity.
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Do this one with by yourself (LS)
A student walks 17 meters north in 3 seconds, pauses for 1 seconds, and then turns around and walks 5 meters back south in 2 seconds. What was the studentβs average speed? What was their average velocity? Draw a picture if it helps!
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