1. 11/6 (p 62) Motion Notes- Speed

4. Reference Point: A place or object used to compare and determine if an object is in motion. Should not be moving, should be visible to compare. http://rpdp.net/terms/mid/full/m/motion.htm http://rpdp.net/terms/mid/full/m/motion.htm

5. What would be the best reference point to tell if the canoe is moving or not? a.The water b.The sky c.The shore d.The lighthouse e.The island

7. Earth rotates on its axis at 1,100 mph or 1670 km/hr. Earth orbits the Sun at 68,000 mph or 107,000 km/hr

8. The whole galaxy rotates at 490,000 mph

9. Measuring Distance  Meter – international unit for measuring distance. = 50 m 1 mm

11. Calculating Speed Speed (S) = distance traveled (d) / the amount of time it took (t). Copy on left page: S (speed, how fast, rate)= d/t SI unit m/s D (distance, how far)= s x t SI unit m T (time, how long) = d/s SI unit s D ST

12. Calculating speed If I travel 100 kilometer in one hour then I have a speed of… 100 km/h If I travel 1 meter in 1 second then I have a speed of…. 1 m/s If I travel 100 km in 2 hours, I have a speed of 100 km/2 h= ____ S = d/t

13. Speed = distance time A snail crawls 1 m in 100 seconds. What is the speed of the snail? = 1 m Problem 1 (left hand side p.): Create a problem like the one above and solve to find the speed. Please use different numbers! =.01 m/s 100s

14. Problem 2 =I ran for 2 hours at a speed of 6 km/h. How far did I run?

15. Types of Speed Constant speed = unchanging speed over a certain period of time. Speed is usually NOT CONSTANT –Ex. Cars stop and go regularly –Runners go slower uphill than downhill Average speed = total distance traveled/total time. Instantaneous speed= speed at any given time.

16. Problem 3: Tina ran 1000 m in 3 minutes. Then ran another 1000 m uphill in 7 minutes. a.Did she have a constant speed? b. Find her average speed. A) 100 m/min B) 2000 m/min C) 10 m/min D) 200 m/min E) 20 m/min

17. Total Dist. = 1000 m + 1000 m = 2000 m Total Time = 3 min + 7 min = 10 min Ave speed = total dist/total time = 2000m/10 min = 200 m/min

18. Problem 4 Jane ran 10 km in 2 hours, and the next 5 km in 1 hour. Did she have a constant speed? (Find speed for each part of her run, is it the same?). What is her average speed? (Total d/total t)

19. OQ: How long would it take a car driving at 100 km/h to go 600 km?

20. 11/6 Motion Notes: Velocity IQ: Did the football in the cartoon move? Did the kid move? How can you tell?

22. It has both speed and direction. Ex. 50km/h south, 10m/s NE

23. Do all these planes have the same speed? Is their velocity different?

24. Problem : Rocket 1 goes 2000 km in 2 hrs. towards the East. Rocket 2 goes 3600 km in 3 hrs. towards the East. Do they have the same a.Speed? b.Velocity? Explain.

25. Which of the following could be the velocity of a moving object? A.12 m/s B.100 m NE C.0.5 m/s W D.1300 s N

26. 11/7 Speed Challenge lab IQ: Word bank: Constant speed, velocity, average speed, instantaneous speed a.I hiked up the mountain at a speed of 1 m/s- _____________ b.At t=10s the rocket was going1000 m/s- ________________ c.The plane flew at 700 km/h E-__________ d.The earth rotates at 1100 mph.- ___________.

27. 11/12 Motion Notes: Acceleration IQ: Complete #1, 3, and 4 on white half sheet.

28. Acceleration Acceleration is a change in speed or direction of an object. Accel = final vel.-initial vel. m/s 2 Time m/s 2

29. Calculating Acceleration If an object is moving in a straight line  Units of acceleration: m/s 2

30. Calculating Acceleration 0 s 1 s2 s3 s4 s 0 m/s 4 m/s 8 m/s 12 m/s16 m/s

31. A cheetah goes from 0 to 60 mi/h in 3s. What is its acceleration?

32. Types of acceleration Increasing speed, positive accel. –Example: Car speeds up at green light Decreasing speed, negative accel./deceleration –Example: Car slows down and comes to a stop at red light Changing Direction –Example: Car takes turn (can be at constant speed) screeeeech

33. Centripetal acceleration

34. Is the car below accelerating?

35. Physics of NFL

36. A car that starts from rest and speeds up to 30 km/hr in 10 seconds has positive acceleration. On your left page calculate the acceleration of the car above. A car that slows down, and comes to a stop from going 100 km/hr in 5 secs. has a negative acceleration or deceleration. On your left hand side page, calculate the acc. of the car above.

37. Question How can a car be accelerating if its speed is a constant 65 km/h? If it is changing directions it is accelerating

38. OQ: Which of the following is NOT accelerating? a.The earth b.A skier going downhill c.A car sitting in the driveway d.A school bus stopping.

39. Centripetal Acceleration When you move in a circular motion, you have continuous acceleration (always changing direction) Acceleration from spinning Centripetal means “toward the center”

40. OQ: Draw the v/t graph for an object that starts out at a high velocity, slows down constantly and comes to a stop.