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Physics of Technology PHYS 1800

Physics of Technology PHYS 1800. Laboratory/Demonstrations 1 Motion. Describing Motion. Position —where you are in space (D-meter) Speed —how fast position is changing with time (DT -1 or m/s) Acceleration —how fast speed is changing with time (DT -2 or m/s 2 )

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Physics of Technology PHYS 1800

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  1. Physics of TechnologyPHYS 1800 Laboratory/Demonstrations 1 Motion

  2. Describing Motion • Position—where you are in space (D-meter) • Speed—how fast position is changing with time (DT-1 or m/s) • Acceleration—how fast speed is changing with time (DT-2 or m/s2) • (we will talk about direction and vectors later)

  3. Graphing Motion Objectives:Understand what position, speed and acceleration are Learn to graph them versus time Develop some intuition for common situations Consider:Standing still Constant speed (different magnitudes) Constant acceleration (different magnitudes) Constant deceleration (different magnitudes) Arbitrary motion Acceleration  Distance  Speed  Time Time Time

  4. Standing Still Acceleration  Distance  Speed  Time Time Time

  5. Standing Still Acceleration  Distance  Speed  Time Time Time

  6. Constant Speed Acceleration  Distance  Speed  Time Time Time

  7. Constant Speed Acceleration  Distance  Speed  Time Time Time

  8. Constant Speed Acceleration  Distance  Speed  Time Time Time

  9. Constant Acceleration Acceleration  Distance  Speed  Time Time Time

  10. Constant Speed Acceleration  Distance  Speed  Time Time Time

  11. Arbitrary Acceleration Acceleration  Distance  Speed  Time Time Time Walk slowly toward the wall at slow constant speed Stop for 2 sec just before the wall Run back to where you started, accelerating constantly Move back half way to wall at fast constant speed Jump up and down Spin around

  12. Units of Motion • Need a distance unit: m, cm, mm, km • ft, in, mi • light years, furlongs • Need a time unit: sec, min, hr, day, year • ms, ns, fs • fortnights • Speed: A distance divided by time(DT-1) • m/s, mi/hr, mm/yr, furlongs/fortnight • Acceleration: A distance divided by time squared(DT-2) • A speed divided by time (DT-2) • m/s2, mi/hr2, mm/yr2, furlongs/fortnight2

  13. Physics of Technology • Next Recitation: First homework set on motion • Tuesday 1:30-2:45 • ESLC 46 • Review Chapter 2 • Next Class: Friday 10:30-11:20 • BUS 318 room.

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