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Honors Physics (Power Point #1)

Honors Physics (Power Point #1). Measurement and Significant figures. The metric system (p.12). We will use the MKS (meters, kilograms, and seconds) unit system in this class.

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Honors Physics (Power Point #1)

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  1. Honors Physics (Power Point #1) Measurement and Significant figures.

  2. The metric system (p.12) • We will use the MKS (meters, kilograms, and seconds) unit system in this class. • The early part of the course will include some simple conversions and you will develop some awareness of “how large or small” a quantity is compared to known values in the English system (mi/hr, miles, etc.)

  3. A cartoon…

  4. The metric system (p. 12)

  5. A first question: • How long is a micro Century (1 X 10 -6 Century) in minutes?

  6. Significant figures… • Read pp. 18-19 for specifics... The racetrack lab and the following example are used as a tutorial. • I do not get overly technical about this, but DO NOT write down all the digits in your calculator. • All homework answers will try to utilize the correct significant figures. • In problem solving… • (a) Round at the end of the problem • (b) You only can be as precise as your least precise measurement. • (c) You are allowed to carry one digit beyond what you can safely measure.

  7. Racetrack Lab Problem…. • A kangaroo hops a distance of 40.000 m in 3.6 seconds. One 5.000 m interval resulted in a change in time ( sec). • (a) What is the average speed of the kangaroo in m/s? (Show work and proper sig. figs) (b) What is the instantaneous speed (speedometer speed) of the kangaroo?

  8. Racetrack Lab Problem Continued… • (c) What is the average speed of the kangaroo in… • (i) km/hr • (ii) mi/hr (1 mi. =1.609 km)

  9. Comparison to other animals maximum speed… • In the air… • Housefly (5 mph), Bat (15 mph), Robin (30 mph), Hummingbird (60 mph), Golden eagle (120 mph) • On land… • Turtle (0.1 mph), Human(20 mph), Greyhound (40 mph), Jack Rabbit (45 mph), Cheetah (70 mph) • In the Water • Goldfish (4 mph), Man (5 mph), Dolphin (20 mph), Barracuda (30 mph)

  10. Drawing a graph… VELOCITY is the SLOPE of a distance, position, or displacement vs. time graph.

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