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Chapter 9

Chapter 9. Overview. Section 1: Describing and Measuring Motion. Reference Point – an object or place used for comparison to determine if something is moving. Motion – a state in which one objects distance from another is changing.

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Chapter 9

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  1. Chapter 9 Overview

  2. Section 1: Describing and Measuring Motion. • Reference Point – an object or place used for comparison to determine if something is moving. • Motion – a state in which one objects distance from another is changing. • International System of Units – universal system of measuring based on the number 10.

  3. Section 2: Speed and Velocity • Speed – The distance an object travels in a certain amount of time. • Speed = 3. Average Speed – The total distance travelled divided by the total amount of time. Distance Time

  4. 4. Instantaneous Speed – Speed at a given moment (what the speedometer on a car reads) 5. Velocity – Speed with direction. Example: 60 ft/s North 6. Slope – The steepness of a line on a graph. Steeper lines mean more speed, less steep lines mean less speed. Slope = Rise/Run

  5. Constant Speed Distance in meters (m) Reference Point

  6. No motion Distance in meters (m) Reference Point

  7. Section 3: Acceleration • Acceleration : ANY change in velocity (speed or direction). • Speeding up • Slowing down (negative acceleration) • Changing Direction (Merry-Go-Round)

  8. 2. Formula for change in speed: Acceleration = 3. Acceleration units will always have two units of time. Ex. km/hr/s or ft/s2 Final Speed – Initial Speed Time

  9. Constant Acceleration Speed in m/s

  10. Constant Speed Speed in m/s

  11. What does this graph show? Distance in meters (m)

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