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Describing and Measuring Motion

Describing and Measuring Motion. When is an object in motion? What is a reference point? Calculate speed and velocity using SI units. Use graphs to show motion. Motion. change in position relative to a reference point. These bikers are NOT in motion relative to EACH OTHER!

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Describing and Measuring Motion

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  1. Describing and Measuring Motion • When is an object in motion? • What is a reference point? • Calculate speed and velocity using SI units. • Use graphs to show motion.

  2. Motion change in position relative to a reference point

  3. These bikers are NOT in motion relative to EACH OTHER! They are in motion relative to the roadside.

  4. distance 100 miles hour time SPEED The International System of Units (SI) is the standard system of metric measurements used by scientists all over the world. The basic SI unit for length (or distance) is _________________. the meter

  5. Speedsee page 24 • Constant – stays the same over the whole time practice

  6. Average Speed • - speed may vary over the time • Avg S = total distance total time practice

  7. Velocity • Speed in a given direction 100 mph Southwest Stop here and do practice

  8. What is acceleration? • Speed • Speed • Changing direction ANY CHANGE IN VELOCITY

  9. Calculation 4m/s A = Vf -Vi t

  10. 22 m/s Calculation 4m/s A = 22 m/s – 4 m/s 3 s A = 18 m/s = 3 s 6 m/s/s OR 6 m/s2 3 sec later The bike is increasing speed by 6 m/s every sec.

  11. Sample problem #1 • An eagle accelerates from 15m/s to 22 m/s in 4 seconds. What is the eagle’s average acceleration?

  12. Sample #2 • A car advertisement states that a certain car can accelerate from rest to 90 km/hr in 9 seconds. What is the car’s average acceleration?

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