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Published byKimberly Roberts Modified over 9 years ago
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September 3, 2010 Average Speed, Velocity, Acceleration
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Average Speed and Average Velocity Average speed describes how fast a particle is moving. It is calculated by: Average velocity describes how fast the displacement is changing with respect to time: always positive sign gives direction
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Average Acceleration Average acceleration describes how fast the velocity is changing with respect to time. The equation is: sign determines direction
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Sample problem: A motorist drives north at 20 m/s for 20 km and then continues north at 30 m/s for another 20 km. What is his average velocity? 24 m/s
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Sample problem: It takes the motorist one minute to change his speed from 20 m/s to 30 m/s. What is his average acceleration? 0.167 m/s 2
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Average Velocity from a Graph t x A B xx tt
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t x A B xx tt
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Average Acceleration from a Graph t v A B xx tt
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Sample problem: From the graph, determine the average velocity for the particle as it moves from point A to point B. 0 -2 1 2 00.10.20.30.40.5 -3 3 t(s) x(m) A B -1.0 m/s
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Sample problem: From the graph, determine the average speed for the particle as it moves from point A to point B. 0 -2 1 2 00.10.20.30.40.5 -3 3 t(s) x(m) A B 1.0 m/s
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