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Motion

Motion. Chapter 1, Section 1 Describing and Measuring Motion. Describing Motion. Not always easy to describe if an object is moving “An object is in motion if its distance from another object is changing.” (p7).

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Motion

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  1. Motion Chapter 1, Section 1 Describing and Measuring Motion

  2. Describing Motion • Not always easy to describe if an object is moving • “An object is in motion if its distance from another object is changing.” (p7)

  3. Reference Point – a place or object used for comparison to determine if something is in motion. (p7) • Use objects like trees or buildings • The answer to the question “is it moving?” depends upon the reference point chosen. • Ex. A chair vs. the sun (p.8)

  4. Use measurement to be more specific when describing motion. • International System of Units (SI) – system of measurement used by scientists. • Unit of measurement used for length is meters (m) • May also be in centimeters (cm), millimeters (mm), etc.

  5. Calculating Speed • You can calculate speed if you know both the distance and object traveled and how long it took to reach its destination. • Speed = Distance / Time • If distance is measured in meters and time is measured in seconds, your answer would be labeled m/s (meters per second).

  6. Most objects to not move at a continuous speed. It changes as the object moves (may speed up or slow down) • Average Speed – total distance traveled divided by the total time. • Instantaneous Speed – the rate at which an object is moving at a specific time.

  7. Describing Velocity • To fully describe the motion of an object you also need to know the direction it is traveling. • Velocity – speed in a given direction • Ex. 25 mph west • Important for air traffic controllers to know the speed and direction of planes • Important for pilots and stunt pilots to be able to keep control of the airplane

  8. Graphing Motion • To show motion in a graph, create a line graph. • Time is on the x-axis • Distance is on the y-axis

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