September 3, 2010 Average Speed, Velocity, Acceleration.

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Presentation transcript:

September 3, 2010 Average Speed, Velocity, Acceleration

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

Average Acceleration  Average acceleration describes how fast the velocity is changing with respect to time. The equation is: sign determines direction

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

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? m/s 2

Average Velocity from a Graph t x A B xx tt

t x A B xx tt

Average Acceleration from a Graph t v A B xx tt

Sample problem: From the graph, determine the average velocity for the particle as it moves from point A to point B t(s) x(m) A B -1.0 m/s

Sample problem: From the graph, determine the average speed for the particle as it moves from point A to point B t(s) x(m) A B 1.0 m/s