Do Now: Grab your personal scantron Turn in your Magnetism work packet Clear your desk

1. Do Now: • Grab your personal scantron • Turn in your Magnetism work packet • Clear your desk Homework: (7)Reading Log 4: pg313-315 (8A) Problems pg 318

2. Trip to Stanford: Campus Tour and Men’s Basketball Game! • When: Saturday, January 14th • Stanford vs. Colorado • To enter the lottery to win a ticket, email Ms. Gamm your name and period by Monday January 9th • I will use excel to randomly pick 2 students

3. Lab Corrections • Due Friday Common lab misconceptions: • changing voltage automatically changes current • add a coil to increase B-field • Moving charges have E & B fields

4. DO NOT WRITE ON YOUR TEST When you are done with your test: Make sure your test version (A or B?) is written on your scantron Bring your test & Scantron to me Start Reading Log pg 313-315

5. Linear Motion

6. Fast • speed • depends on distance and time • averagespeed • uses total distance and total time

7. Frame of Reference • speed is relative • F.o.R. is something to compare speed to • How fast are you moving now? • Earth is rotating at 1,000 mph

8. Frame of Reference • Earth is orbiting sun at 66,000 mph • Everything in universe is moving

9. Frame of Reference • So, if you drive 55 mph, you are going 55mph relative to the earth • Universe speed limit:speed of light • 3 x 10 8m/s • Is car moving?

10. Velocity • Scalar vs. Vector • scalar: measures only the amount • ex: temperature, area, distance traveled • vector: measures both amount and direction • vector: scalar and direction • ex: weight • in whichdirection is weight directed?

11. Displacement • speed = distance / time • velocity = displacement / time • distance: log of total miles traveled • displacement: change in position • displacement: distance from start to end arrows mean they are vectors distance displacement

12. Time to Practice Go to pg. 318

13. Do Now: 1. Graph your Quizest score on your tracker! 2. Check yourself page 316-317 • Work in Pairs • Write a short explanation for each Question • First 4 pairs to finish receives 3 tickets! Homework: (8B) Problems pg 319-321 (14 & 15 Honors only)

14. QuizestCorrections & retake • Come in after school to do corrections (Due Friday) • If you do corrections, you receive the higher of the two scores • If you don’t, you receive the average • Retake on Friday in room 308

15. Tuesday Tutoring • Stop by if you need homework help • Or converting help…

16. Check Yourself pg 316-317 • B • A • B • A • B • A • B • C • B • C • A • B • A • B • B

17. Start pg 319-321 Remember conversions! 8. Convert minutes to hours 9. Convert m to mi (1 mi = 1609 ft) and mach speed = 331 m/s 10. Convert feet to miles (1 mi = 5280 ft) and seconds to hours 12. Convert km to m

18. Homework Answers pg 318 • Distance is same, but displacement is shorter on track B, thus B is faster 2A.) Vbicycle = 8 mph, Vwest= 21 mph, Veast= 39 mph 2B.) Vboy= 39 mph, Vbicycle= 47 mph, Vwest = 60 mph 3.) Any straight line motion in one direction 4.) Any trip where you finish where you started and moved some distance 5A.) 12 blocks 5B.) 4 blocks

19. Homework Answers pg 319 6.) Vavg = 6.25 m/s 7A.) Vavg = 26 mph 7B.) = 2 mph 8.) Vavg = 66 mph 9.) t = 1.6 minutes 10.) 6 mph over the speed limit 11.) saves 5.2 minutes 12.) wait 210 s

20. Homework Answers pg 320 13A.) Vavg = 38 mph, 13B.) = 27 mph 14.) v = 21 m/s 15.) d = 0.83 mi

21. Variable Unit Graphing Rules Distance (m) • Use a ruler (straightedge)! • Label your axes! • (units in parentheses) • time is always below Time (s)

22. Distance (m) Time (s) Graphing Rules Distance vs. Time • 3.Title the graph! • (Y vs. X)

23. Graphing Rules • 4.SCALE. • Stretch out your axes!

24. Graphing Rules • 5. Use a Pencil!! • 6. Do not just connect the dots! Line of best fit curve: smooth line: ruler they might not touch dots

25. Distance (m) Time (s) Graphing Rules • Drawing tangent lines • drawn at a point • “balance” ruler on curve • perpendicular with normal Distance vs. Time Ahh. Just right! • make it long enough to find the slope

26. Graphing

27. Movies And now for a short movie

28. Eureka: Inertia

29. Eureka: Mass

30. Eureka: Speed

31. Labette Graphing Motion pg. 305

32. Acceleration • accelerationthe rate of change of velocity • final velocity • initial velocity • refers to speeding up and slowing down or… arrows mean …

33. ExampleA car moving at 20 m/s comes to a stop in four seconds. What was the car’s acceleration? Given: Want:

34. Examplesolve for acceleration said “negative five meters per second per second” negative acceleration means… slowing down

36. Acceleration • you “feel” speed when you accelerate • This includes speeding up, slowing down and • sharp turns at constant speed! • All three are accelerations

37. Eureka: Acceleration I

38. Speed vs. Time Graphs • look at the slope • units are m/s/s=m/s2 • acceleration! • same answer as example

39. Speed vs. Time Graphs • So, to summarize the graphs: • For distance vs. time: • slope = speed • For speed vs. time: • slope = acceleration • area under line = distance covered

40. Eureka: Acceleration II

41. Freefall • freefall objects moving under only force of gravity • terminal velocity when air resistance becomes equal to gravity • due to gravity = g • g = 9.8 m/s2

42. Freefall • let’s look at the motion of three objects • one dropped from rest • one thrown downwards • one thrown upwards • All of these motions are types of… freefall!

43. Freefall • let’s look at the motion of three objects • one dropped from rest • one thrown downwards • one thrown upwards • All of these motions are types of… freefall!

44. Eureka: Gravity

45. Lab Acceleration due to Gravity pg. 314

46. Putting it together • Let’s use what we know about graphs to make two more formulas. • Let’s look at the graph from ti to tf

47. Putting it together • each time matches up with a velocity • First velocity is vi and last is vf vf vi

48. Putting it together • To find distance: • area under the line • two shapes: • triangle • and rectangle vf vi

49. Putting it together • d = area of rectangle + area of triangle • area of rectangle • area of triangle vf vi

50. Putting it together we now have a connection between a and d