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8.2 Speed Vs Velocity

8.2 Speed Vs Velocity. Speed (v): the distance an objects travels over a given time interval scalar quantity, SI unit is m/s Velocity: ( v ) describes the displacement of an object during a given time interval OR how fast an object’s position is changing

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8.2 Speed Vs Velocity

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  1. 8.2 Speed Vs Velocity Speed (v): • the distance an objects travels over a given time interval • scalar quantity, SI unit is m/s Velocity: ( v ) • describes the displacement of an object during a given time interval OR how fast an object’s position is changing • velocity can be zero, negative or positive • scalar quantity, SI unit is m/s

  2. Position Time Graphs & Average Velocity • The slope of a position time graph = average velocity • The rate of change in position for a time interval of an object • Vector quantity, represented as: Vav • Positive Velocity = object is moving away from the origin with uniform speed • Zero Velocity = object is stationary • Negative Velocity = object is returning to its origin with uniform motion

  3. Velocity • 2 People Racing (text pg. 364) Recall the equation for Average Velocity! = df – di OR = RISE tf – ti RUN

  4. Position Time Graph of Racers Solve the following: • 1. Who is going faster? How do you know? • Who has the greatest velocity?

  5. Converting Units Converting between m/s to km/h • Recall: there are 60 s in 1 min and 3600 s in 1 hr • Recall: there are 1000 m in 1 km Example: 55km x (1000m) x (1 h) = 15 m/s [W] 1 h (1km) (3600s)

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