September 3 , 2010

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# September 3 , 2010 - PowerPoint PPT Presentation

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.

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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?

0.167 m/s2

x(m)

3

2

1

0

A

-1

B

-2

-3

0

0.1

0.2

0.3

0.4

0.5

t(s)

• Sample problem: From the graph, determine the average velocity for the particle as it moves from point A to point B.

-1.0 m/s

x(m)

3

2

1

0

A

-1

B

-2

-3

0

0.1

0.2

0.3

0.4

0.5

t(s)

• Sample problem: From the graph, determine the average speed for the particle as it moves from point A to point B.

1.0 m/s