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Physical World

Physical World. Lecture 6. Units Can only add or subtract quantities that have like units. If this is the case add or subtract the numbers then assign the similar unit. a) 5 m + 11 m = 16 m b) 11 in – 5 in = 6 in c) 5ft + 6 in = can not add, must convert first 5ft + .5ft = 5.5 ft. Units

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Physical World

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  1. Physical World Lecture 6

  2. Units • Can only add or subtract quantities that have like units. If this is the case add or subtract the numbers then assign the similar unit. • a) 5 m + 11 m = 16 m • b) 11 in – 5 in = 6 in • c) 5ft + 6 in = can not add, must convert first • 5ft + .5ft = 5.5 ft

  3. Units • You can multiply or divide any units. The units are then treated like variables, like in algebra. • a) 12m x 10m = 120m^2 • b) 12g/3ml = 4 g/ml • c) x/x = 1 • There may be special cases where you should convert before multiplying or dividing. • 2 m x 30cm = 2m x .3m = .6m^2

  4. Conversions using Ratios • Book pg 656 & 657 • Basics: Convert 400kg to g • Write down what you are trying to convert • 400 kg • Set up ratio with known relationship • 400 kg (_1000 g) • ( 1 kg)

  5. Further Info • See the website below for practice and a more descriptive explanation • http://faculty.fortlewis.edu/Milner_d/Unit%20Analysis%20Activity%20(2).doc • Also see Test #1 conversion problems on ARIS site

  6. Motion – Chp 2 • Use speed, velocity, and acceleration in separate sentences. • Are there any differences? What are they? • Define each. What is speed? Velocity? Acceleration? • How are they calculated?

  7. Motion • Two Fundamental components • Delta = change

  8. Motion • Is a • Three primary motions

  9. Linear Motion • Speed – • Average Speed • Instantaneous Speed • Constant Speed

  10. Speed • Average Speed – • Speed = Speed = d t

  11. Variations of Speed Formula • Original: s = d/t (only one given on test) • variations: • d = t x s • t = d/s s

  12. Units for speed • Depends on what is given and what is asked for in problem • Ex: Given distance in meters and time in seconds. • Unit is meters/second or m/s • Ex: Given distance in kilometers and time in hours. Problem asks for speed in m/s

  13. Speed • Instantaneous Speed – • Speedometer • Radar Gun

  14. Speed • Constant Speed – • Maintaining a speed of 50mph

  15. Constant Speed • It is difficult to maintain a constant speed while driving to campus. Factors that contribute to this difficulty.

  16. Velocity

  17. Acceleration • Rate at which motion changes over time • Three ways this can occur

  18. Acceleration

  19. Acceleration

  20. Acceleration • Increasing speed = • Decreasing speed =

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