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Equations and Concepts of Average Speed, Velocity, and Acceleration

This daily question provides an overview of the equation for average speed, along with explanations of instantaneous speed, velocity, and acceleration. It also includes practice problems to reinforce understanding.

johnkgreen
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Equations and Concepts of Average Speed, Velocity, and Acceleration

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  1. DAILY QUESTION January 6, 2009 • What is the equation for average speed?

  2. Agenda 1/6/09 • Daily Question • Check-in: Distance-Time Graph Wksht Staple Bentley Certificates to D-T Wksht!  • Chapter 10 – Motion • Notes • BrainPop - Acceleration • Assignments: 1. Problems Worksheet due 1/7

  3. Average Speed • Average speed over the entire distance • Speed = Distance / Time • SI Unit is: m/s

  4. Average Speed • Practice: A runner finishes a 100 meter dash in 45 seconds. What is the runner’s average speed?

  5. Instantaneous Speed • Speed at a given point in time • A car’s speedometer

  6. Velocity • The speed and direction of motion • When a problem requires you to calculate velocity, use the speed equation and remember to specify direction. • Find: speed = distance/time and give direction

  7. Velocity • Practice: Find the velocity of a swimmer who swims 110 meters toward the shore in 72 seconds.

  8. Acceleration • Any change in velocity is called acceleration • If you: • Increase speed • Decrease speed • Change direction You are accelerating!

  9. Acceleration • The rate at which velocity changes over time Acceleration = final velocity – initial velocity time SI unit is: m/s2

  10. Acceleration • Practice: A turtle swimming a straight line toward shore has a speed of 0.50 m/s. After 4.0 seconds, its speed is 0.80 m/s. What is the turtle’s average acceleration?

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