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Chapter 11: Motion and Speed

Chapter 11: Motion and Speed. Section 1: Describing Motion. Speed. Speed is how far you travel over a period of time. Speed is expressed in the formula s=d/t (speed = distance/time). If you walk 20 meters over 10 seconds, this formula would show that you have a speed of 2 m/s.

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Chapter 11: Motion and Speed

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  1. Chapter 11: Motion and Speed Section 1: Describing Motion

  2. Speed • Speed is how far you travel over a period of time. • Speed is expressed in the formula s=d/t (speed = distance/time). • If you walk 20 meters over 10 seconds, this formula would show that you have a speed of 2 m/s.

  3. Average speed • Average speed is used to calculate the speed traveled over a total distance in a certain time. • If you drive 360 miles to Florida over 6 hours time, the formula s(average) = d(total)/t(total) will calculate that you have traveled at an average speed of 60 miles per hour.

  4. Instantaneous Speed • Instantaneous speed is how fast you are traveling at a given time. • Think of a speedometer on a car. Unless you are using cruise control, the speed you are traveling changes all the time. This is instantaneous speed which shows how fast you are going at that particular instant.

  5. Graphing speed • A distance-time graph shows the change in distance of an object over a time interval. The slope formed on the graph shows an object’s speed.

  6. Velocity • Velocity is simply speed plus direction. Where 15 mph is a speed, 15 mph south is a velocity. • So, can you travel at a constant (unchanging) speed but still have a changing velocity? • Yes, velocity changes due to a change in speed, direction or both speed and direction.

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