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Linear Motion - Velocity

Principles of Physics. Linear Motion - Velocity. Linear Motion. motion along a straight line path, motion in one dimension Which way are you headed? How far did you go? How fast are you going? Is your speed changing?. How fast are you going?. Velocity Rate at which position changes

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Linear Motion - Velocity

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  1. Principles of Physics Linear Motion - Velocity

  2. Linear Motion • motion along a straight line path, motion in one dimension • Which way are you headed? • How far did you go? • How fast are you going? • Is your speed changing?

  3. How fast are you going? Velocity • Rate at which position changes • In other words, how quickly the position of an object changes during the time interval • Measured in meters per second (miles per hour in the USA)

  4. Average Velocity • Velocity is calculated = average velocity (m/s) d = displacement (m) t = time (s) • Average because we don’t know exactly what is happening from the 1st position to the next • The object could be speeding up and slowing down along the way • Vector quantity – has direction • Direction is + when right, up, north, or east • Direction is – when left, down, south, or west

  5. Instantaneous Velocity • Instantaneous speed = speed at any particular point • Can be determined by speedometer, but not by

  6. Examples • Rick walked 50 m in 60 s. What was his average speed? Givens: d = 50 m t = 60 s v = ?

  7. Examples 2. A car has an average velocity of 20 m/s east. How long would it take the car to travel 85 m? Givens: v = 20 m/s t = ? d = 85 m

  8. Examples 3. Anna watches a thunderstorm from her window. She sees the flash of a lightning bolt and begins counting the seconds until she hears the clap of thunder 10.0 seconds later. Assuming that the speed of sound in air is 330 m/s, how far away was the lightning bolt? (Assume that she sees the bolt instantaneously). Givens: v = 330 m/s t = 10 s d = ?

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