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-Speed and Velocity -Uniform Linear Motion Physics Mrs. Coyle http://www.wallpaperbase.com/wallpapers/sports/formula1/formula_1_3.jpg

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Speed and Velocity Average Speed= Total Distance Travelled Time v=d/t(Scalar) Average Velocity= Displacement Time v= d / t =(d 2 -d 1 ) / (t 2 - t 1 ) (Vector)

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Vectors and Scalars Scalar Magnitude (size) Vectors Magnitude and Direction

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Example: A car is travelling at an average velocity of 55km/h, N, when the driver sees a box on the road. If the reaction time of the driver is 0.45sec, how far does the car travel at that velocity before the driver even begins to break?

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Instantaneous Speed Instantaneous Velocity Instantaneous Speed Speed at a given instant (ex: speedometer of car) Instantaneous Velocity Velocity at a given instant Instantaneous speed is the magnitude of instantaneous velocity.

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Note: Average speed is equal to the magnitude of average velocity ONLY when velocity is CONSTANT (magnitude and direction).

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Uniform Linear Motion: Motion with constant velocity Straight line Same direction

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If the speed on this ride is constant, is the motion uniform linear motion?

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Graphs of Motion: -Position-Time -Velocity-Time -Acceleration-Time

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Example: Position vs Time for Uniform Linear Motion Time (s) o Position (m) Note: The slope of the line in a Position-Time Graph equals the average velocity.

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Example: Velocity vs Time for Uniform Linear Motion Time (s) o Velocity (m/s)

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Example: Position vs Time Graph What is the avge velocity at the time intervals: (0s-1s)(1s-1.5s)(1.5s-1.7s)(1.7s-2.0s) Draw the velocity – time diagram. Time, (s) o Position, (m) 1.00.51.52.0 20.0 10.0 A

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Note: The area under the line (curve) of a velocity- time graph is equal to the displacement of the object during that time interval.

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