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CH2 - Linear Motion

# CH2 - Linear Motion - Linear Motion Chapter 2 Scalars vs...

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Linear Motion Chapter 2

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Scalars vs. Vectors Scalars are quantities that have a magnitude, or numeric value which represents a size i.e. 14m or 76mph. Vectors are quantities which have a magnitude and a direction, for instance 12m to the right or 32mph east .
Distance vs. Displacement

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Distance vs. Displacement   The person, according to a pedometer has walked a total of 12m. That is the distance traveled. The person walking starts where she stops, so her displacement is zero.
Example #1 If you walk 100 m east and then turn around and walk 20 m west, A) What is your distance you walked? B) What is your displacement?

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Distance vs. Displacement Start End 6m 3m 3m 1m Distance-Add all the distances together, totals 13m. Add the left/right pieces and the up/down pieces and use the Pythagorean Theorem. Displacement-Measured from beginning to end.
Example #2 Start End 6m 3m 3m 1m 6m right + 3m left=3m right 3m down + 1m down=4m down The total displacement is 5m. You also need to include a direction, but we will take care of that in the next chapter.

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Measuring how fast you are going Speed v Scalar Standard unit is m/s Velocity v Vector Standard unit is m/s, plus direction t d time nt displaceme v = = t d time distance v = =
Example #3 Brad and Angelina go for a walk at 1.3 m/sec East for 30 min. A) How far did they go? B) Upon returning home, what distance did they travel? C) What is their displacement?

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Example #4 A boy takes a road trip from Philadelphia to Pittsburgh. The distance between the two cities is 300km. He travels the first 100km at a speed of 35m/s and the last 200km at 40m/s. What is his average speed?
Example #4 A boy takes a road trip from Philadelphia to Pittsburgh. The distance between the two cities is 300km . He travels the first 100km at a speed of 35m/s and the last 200km at 40m/s . What is his average speed ?

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Different types of velocity and speed Average velocity/speed A value summarizing the average of the entire trip.
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