Measuring and Describing MotionMeasuring and Describing Motion

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How do you know you are moving?How do you know you are moving?

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MotionMotion

Change in Change in position relative position relative to reference pointto reference point

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Relative MotionRelative MotionEarth moves 30 kilometers Earth moves 30 kilometers every second around sunevery second around sun– New York to LA in two New York to LA in two

minutes.minutes.77

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Distance (Meter)Distance (Meter)

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Calculating SpeedCalculating Speed

Speed = Speed =

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DistanceDistance Time Time

* All objects have speed* All objects have speed

Average SpeedAverage Speed

Average Speed = Average Speed =

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Total DistanceTotal Distance Total Time Total Time

32 km for 2 hours32 km for 2 hours

13 km for 1 hour13 km for 1 hour

AS = 45 km/3 hrs = 15 km/hrAS = 45 km/3 hrs = 15 km/hr

Instantaneous SpeedInstantaneous Speed

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Speed at a specific point in timeSpeed at a specific point in time

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Describing VelocityDescribing Velocity

Velocity = Speed and directionVelocity = Speed and direction

Vector = Size and directionVector = Size and direction

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Graphing MotionGraphing Motion

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Different SlopesDifferent Slopes

Segment 1 = 150 m/minSegment 1 = 150 m/min

Segment 2 = 0 m/min (flat line)Segment 2 = 0 m/min (flat line)

Segment 3 = 200 m/min (steeper)Segment 3 = 200 m/min (steeper)

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