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Week 1 Day 2 Announcements

Make sure you check the calendar and day page after every class in case there are changes Books in Bookstore?

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Week 1 Day 2 Announcements

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  1. Make sure you check the calendar and day page after every class in case there are changes Books in Bookstore? While participating in the problem solving session is important, you need to be in the one associated with this class => Phyc 157 – 001 or other sessions designated by Dr. SaulTaking the Phyc 157 from the other P151 class will not be that useful Remember to take the Supplemental Help Time Survey by midnight tonight. Problem Solving Sessions will meet today at 11 and at noonand Thursday at 11 AM Week 1 Day 2 Announcements

  2. Questions about the class • How percentage of class points do you need to get a B? • 70 • 75 • 80 • 85 • 90 Slide 1-1

  3. Answer • How percentage of class points do you need to get a B? • 70 • 75 • 80 • 85 • 90 Slide 1-2

  4. Questions about the class • If you have missed more than one day of class due to illness, where can you go to get an excused absence? • Instructor • Physics Department Chair • Dean of Student Services • Your Academic Advisor • Your major department chair Slide 1-1

  5. Questions about the class • If you have missed more than one day of class due to illness, where can you go to get an excused absence? • Instructor • Physics Department Chair • Dean of Student Services • Your Academic Advisor • Your major department chair Slide 1-1

  6. Times for Problem Solving (Discussion) Sessions • I can attend one of the specified Problem Solving Sessions • I could but probably will not attend one of the specified problem solving sessions • I cannot attend any of the specified problem Solving Sessions due to other time commitments • Case 1 • Wed. @ 11 AM, Wed. @ noon, and Thurs. @ 11 AM • Case 2 • Wed. @ 11 AM, Wed. @ noon, and Wed. @ 5 PM • Case 3 • Wed. @ 10 AM, Wed. @ 11 AM, and Thurs. @ 11 AM Slide 1-2

  7. 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 Course Format - Like class on Shakespeare

  8. 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

  9. 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

  10. 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

  11. Units Is pi x 107 a good representation of the number of seconds in a year? Slide 1-7

  12. 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 = 0.621 mi 2.2 lbs = 1 kg Good Conversions to Know (or have handy)

  13. Slide 1-31

  14. Slide 1-28

  15. Slide 1-29

  16. Slide 1-30

  17. Reading Quiz • What is the difference between speed and velocity? • Speed is an average quantity while velocity is not. • Velocity contains information about the direction of motion while speed does not. • Speed is measured in mph, while velocity is measured in m/s. • The concept of speed applies only to objects that are neither speeding up nor slowing down, while velocity applies to every kind of motion. • 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. Slide 1-5

  18. Answer • What is the difference between speed and velocity? • Speed is an average quantity while velocity is not. • Velocity contains information about the direction of motion while speed does not. • Speed is measured in mph, while velocity is measured in m/s. • The concept of speed applies only to objects that are neither speeding up nor slowing down, while velocity applies to every kind of motion. • 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. Slide 1-6

  19. Reading Quiz • The quantity 2.67 x 103 m/s has how many significant figures? • 1 • 2 • 3 • 4 • 5 Slide 1-7

  20. Answer • The quantity 2.67 x 103 m/s has how many significant figures? • 1 • 2 • 3 • 4 • 5 Slide 1-8

  21. How to describe motion What information do you need to communicate to be able to tell someone how to reproduce a motion? Slide 1-7

  22. How to describe motion • 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 Slide 1-7

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