© 2010 Pearson Education, Inc. Questions about the class 1.How percentage of class points do you need to get a B? A.70 B.75 C.80 D.85 E.90 Slide 1-1

© 2010 Pearson Education, Inc. Answer 1.How percentage of class points do you need to get a B? A.70 B.75 C.80 D.85 E.90 Slide 1-2

© 2010 Pearson Education, Inc. Course Format - Like class on Shakespeare *Before class, learn material from reading - focus on key ideas, express them in your own words *In class, build understanding of readings through activities and learn to apply ideas *Homework, practice what you learn and deepen understanding

© 2010 Pearson Education, Inc. Semester Theme Learning to understand and how to analyze motion Describing Motion Forces Momentum Energy Circular Motion Rotational Motion Oscillations and Waves Thermodynamics Fluids Slide 1-7

© 2010 Pearson Education, Inc. Units Is a penny equal to a dollar? Start with $ 0.10 = 10 cents Square both sides $.001 = 100 cents Does a penny (100 cents) = dollar? (why not?) Slide 1-7

© 2010 Pearson Education, Inc. Units How fast is 50 m/s in miles per hour? Being able to convert between English units and Metric units is considered by the University to be a major course goal Slide 1-7

© 2010 Pearson Education, Inc. Units Is pi x 10 7 a good representation of the number of seconds in a year? Slide 1-7

© 2010 Pearson Education, Inc. Good Conversions to Know (or have handy) Rule of Thumb - Approximations *1 m/s ~ 2 mph *2 lbs ~ 1 kg *1.6 km = 1 mi 1 km = 0.6 km *1 liter ~ 1 quart More exact conversions *2.54 cm = 1 inch *1.609 km = 1 mi 1 km = mi *2.2 lbs = 1 kg

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© 2010 Pearson Education, Inc. Slide 1-28

© 2010 Pearson Education, Inc. Slide 1-29

© 2010 Pearson Education, Inc. Slide 1-30

© 2010 Pearson Education, Inc. 1.What is the difference between speed and velocity? A. Speed is an average quantity while velocity is not. B. Velocity contains information about the direction of motion while speed does not. C. Speed is measured in mph, while velocity is measured in m/s. D. The concept of speed applies only to objects that are neither speeding up nor slowing down, while velocity applies to every kind of motion. E. Speed is used to measure how fast an object is moving in a straight line, while velocity is used for objects moving along curved paths. Reading Quiz Slide 1-5

© 2010 Pearson Education, Inc. 1.What is the difference between speed and velocity? A. Speed is an average quantity while velocity is not. B. Velocity contains information about the direction of motion while speed does not. C. Speed is measured in mph, while velocity is measured in m/s. D. The concept of speed applies only to objects that are neither speeding up nor slowing down, while velocity applies to every kind of motion. E. Speed is used to measure how fast an object is moving in a straight line, while velocity is used for objects moving along curved paths. Answer Slide 1-6

© 2010 Pearson Education, Inc. Reading Quiz 2.The quantity 2.67 x 10 3 m/s has how many significant figures? A. 1 B. 2 C. 3 D. 4 E. 5 Slide 1-7

© 2010 Pearson Education, Inc. Answer 2.The quantity 2.67 x 10 3 m/s has how many significant figures? A. 1 B. 2 C. 3 D. 4 E. 5 Slide 1-8

© 2010 Pearson Education, Inc. How to describe motion Slide 1-7 What information do you need to communicate to be able to tell someone how to reproduce a motion?

© 2010 Pearson Education, Inc. How to describe motion Slide 1-7 What information do you need to communicate to be able to tell someone how to reproduce a motion? Frame of reference or reference frame Origin Where to start What direction to start moving What speed to start moving with Changes in direction or speed Where to stop Timing