8.2 Speed Vs Velocity Speed (v):

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Presentation transcript:

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

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 Refer to text page 365 for sample calculations and Assign Hw page 369 1-3 and page 370 #1-6

Velocity 2 People Racing (text pg. 364) Vector symbols should be there above position Recall the equation for Average Velocity! = df – di OR = RISE tf – ti RUN

Position Time Graph of Racers Solve the following: 1. Who is going faster? How do you know? Who has the greatest velocity? See Text page 365 for sample calculations

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) HW