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Speed Velocity Acceleration
Describing Motion Speed Velocity Acceleration
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Speed Average speed Distance moved per unit time Average speed = Units
ms-1 distance moved time taken
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Distance and speed are scalar quantities
Scalar Quantity Magnitude Number and unit Vector Quantity Magnitude and direction
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Vector Quantities Displacement Velocity Distance + direction
Displacement = final position – initial position Velocity Speed + direction Average velocity = displacement time taken
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Acceleration The rate of change in velocity Change in speed
Speeding up Slowing down deceleration Change in direction Both Average Acceleration = change in velocity time taken
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Graphs Distance versus time Slope of the graph = average speed
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Graphs
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Example Calculate Albert's and Bob’s average speeds.
Calculate Charlie’s average speed between 0 and 8 s 8 and 13 s 13 and 17 s
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Graphs Speed versus time Slope of the graph = average acceleration
Area under the graph = distance traveled
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Speed and Acceleration
Calculate the average acceleration between 0 and 5 s 10 and 13 s 16 and 21 s
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Speed and Acceleration
Calculate the distance traveled between 0 and 5 s 0 and 13 s Calculate the total distance traveled
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The End
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