1. Table of Contents Chapter 9 Motion and Energy Chapter Preview 9.1 Describing Motion 9.2 Speed and Velocity 9.3 Acceleration 9.4 Energy

2. You are in a stationary car and another car passes you. How would you describe the motion of the other car? How can you describe an object’s motion? Chapter 9 Motion and Energy

3. Chapter Preview Questions 1.Is a moving bus a good reference point from which to measure your position? a. No, because it is often late. b. No, because it is not a stationary object. c. Yes, because it is very large. d. Yes, because it can travel very far. Chapter 9 Motion and Energy

4. Chapter Preview Questions 2.To describe a friend’s position with respect to you, you need to know a. Your friend’s distance from you. b. The direction your friend is facing. c. Your friend’s distance and direction from you. d. Your friend’s distance from a nearby object. Chapter 9 Motion and Energy

5. Chapter Preview Questions 3. Two cars traveling in the same direction pass you at exactly the same time. The car that is going faster a. moves farther in the same amount of time. b. has more mass. c. has the louder engine. d. has less momentum. Chapter 9 Motion and Energy

6. Chapter Preview Questions 4. To describe an object’s motion, you need to know its a. position. b. change in position. c. distance. d. change in position over time. Chapter 9 Motion and Energy

7. Chapter Preview Questions 1.Is a moving bus a good reference point from which to measure your position? a. No, because it is often late. b. No, because it is not a stationary object. c. Yes, because it is very large. d. Yes, because it can travel very far. Chapter 9 Motion and Energy

8. Chapter Preview Questions 2.To describe a friend’s position with respect to you, you need to know a. Your friend’s distance from you. b. The direction your friend is facing. c. Your friend’s distance and direction from you. d. Your friend’s distance from a nearby object. Chapter 9 Motion and Energy

9. Chapter Preview Questions 3. Two cars traveling in the same direction pass you at exactly the same time. The car that is going faster a. moves farther in the same amount of time. b. has more mass. c. has the louder engine. d. has less momentum. Chapter 9 Motion and Energy

10. Chapter Preview Questions 4. To describe an object’s motion, you need to know its a. position. b. change in position. c. distance. d. change in position over time. Chapter 9 Motion and Energy

11. End of Chapter Preview Chapter 9 Motion and Energy

12. Section 1: Describing Motion When is an object in motion? What is the difference between distance and displacement? Chapter 9 Motion and Energy

13. Motion: An Object’s change in distance with respect to another object. (reference point)

14. Relative Motion Whether or not an object is in motion depends on the reference point you choose. Chapter 9 Motion and Energy - Describing Motion

15. Distance and Displacement Distance is the total length of the actual path between two points. Displacement is the length and direction of a straight line between starting and ending points. Chapter 9 Motion and Energy

16. Physical Science and Motion Draw 5 motion pictures in your notes from the movie.

17. Answer the Assess questions in complete sentences!!! Pg. 341- 1a, 1b, 2a, & 2c

18. End of Section: Describing Motion Chapter 9 Motion and Energy

19. Section 2: Speed and Velocity How do you calculate speed? How can you describe changes in velocity? How can you interpret graphs of distance versus time? Chapter 9 Motion and Energy

20. Calculating Speed the distance an object travels in a certain amount of time = speed of the object. Chapter 9 Motion and Energy

21. Formula for speed:speed: SPEED = DISTANCE/ TIME or… d=st t=d/s

22. You can take average speed… Moving objects that are not at a constant speed. Formula: Total distance/ Total time Instantaneous speed= objects moving in a given instant in time.

23. Velocity Velocity is speed in a given direction. Vector measurement because it has a given magnitude and direction. Changes in velocity may be due to changes in speed, changes in direction, or both. A storm is traveling east at 50 mph. What is the velocity?

24. Practice Problems Text book pg. 347….1b and c

25. Velocity WRITE 3 FACTS Click the Video button to watch a movie about velocity. Chapter 9 Motion and Energy

26. SLOPE to determine distance vs. time SLOPESLOPE is equal to rise/run Graphing Speed: A distance-versus-time graph represents speed, the rate that distance changes in relation time. The steeper the slope, the greater the speed A constant slope represents motion at constant speed.

27. Graphing Motion You can use distance-versus-time graphs to interpret motion. Chapter 9 Motion and Energy

28. Answer assess questions in completer sentences!!! PG. 347---- 3a and b

29. Graphing Motion Activity PHSchool.com Enter Code:cgp-3011 Click the Active Art button to open a browser window and access Active Art about graphing motion. Chapter 9 Motion and Energy

30. End of Section: Speed and Velocity Chapter 9 Motion and Energy

31. Section 3: Acceleration What kind of motion does acceleration refer to? How do you calculate acceleration? What graphs can be used to analyze the motion of an accelerating object? Chapter 9 Motion and Energy

32. Acceleration Acceleration refers to increasing speed, decreasing speed, or changing direction

33. Calculating Acceleration To determine the acceleration of an object, you must calculate its change in velocity per unit of time. Chapter 9 Motion and Energy

34. Calculating Acceleration As a roller-coaster car starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22 m/s in the same direction. What is its acceleration? Read and Understand What information have you been given? Initial velocity = 4 m/s Final velocity = 22 m/s Time = 3 s Chapter 9 Motion and Energy

35. Calculating Acceleration As a roller-coaster car starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22 m/s in the same direction. What is its acceleration? Plan and Solve What quantity are you trying to calculate? The acceleration of the roller-coaster car = __ What formula contains the given quantities and the unknown quantity? Acceleration = (Final velocity - Initial velocity)/Time Perform the calculation. Acceleration = (22 m/s - 4 m/s)/3 s = 18 m/s/3 s Acceleration = 6 m/s 2 The acceleration is 6 m/s 2 down the slope. Chapter 9 Motion and Energy

36. Calculating Acceleration As a roller-coaster car starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22 m/s in the same direction. What is its acceleration? Look Back and Check Does your answer make sense? The answer is reasonable. If the car’s velocity increases by 6 m/s each second, its velocity will be 10 m/s after 1 second, 16 m/s after 2 seconds, and 22 m/s after 3 seconds. Chapter 9 Motion and Energy

37. Calculating Acceleration Practice Problem A falling raindrop accelerates from 10 m/s to 30 m/s in 2 seconds. What is the raindrop’s acceleration? (30 m/s - 10 m/s) ÷ 2 seconds = 10 m/s 2 Chapter 9 Motion and Energy

38. Calculating Acceleration Practice Problem A certain car can accelerate from rest to 27 m/s in 9 seconds. Find the car’s acceleration. (27 m/s - 0 m/s) ÷ 9 s = 27 m/s ÷ 9 s = 3 m/s 2 Chapter 9 Motion and Energy

39. Graphing Acceleration You can use both a speed-versus-time graph and a distance- versus-time graph to analyze the motion of an accelerating object. Chapter 9 Motion and Energy

40. Links on Acceleration PHSchool.com Enter Code: scn-1313 Click the SciLinks button for links on acceleration. Chapter 9 Motion and Energy

41. Answer Assess ?s in complete sentences in notes!! Pg. 355- 1c, 2b, 3a

42. End of Section: Acceleration Chapter 9 Motion and Energy

43. Section 4: Energy What factors affect an object’s kinetic energy and potential energy? How can kinetic energy and potential energy be transformed? What is the law of conservation of energy? Chapter 9 Motion and Energy

44. Kinetic Energy- The energy an object has due to motion. Kinetic energy increases as mass and speed increase. Chapter 9 Motion and Energy

45. Kinetic Formula and Practice KE= ½ x Mass x Speed ^2 A 1500 kg car is moving at a speed of 10m/s. What is the KE? KE= ½ x 1500 x (10m/s)^2

46. Potential Energy- stored energy that results from the position or shape of an object. Gravitational potential energy increases as weight and height increase. Chapter 9 Motion and Energy

47. G. Potential Energy Formula and Practice Depends on weight and height relative to reference point! GPE= Weight x Height What is the GPE of a 50kg pole-vaulter when she is 4m above the ground? 50 kg x 4m=

48. Mechanical Energy An objects combined kinetic and potential energy. Mechanical= Kinetic+ Potential energy

49. Transformations Between Potential and Kinetic Energy Any object that rises or falls experiences a change in its kinetic energy and gravitational potential energy. A pendulum continuously transforms energy from kinetic to potential energy and back. Chapter 9 Motion and Energy

50. Energy Conservation The Law of Conservation of Energy states that when one form of energy is transformed to another and no energy is destroyed in the process.

51. Lets sum this up in FOOTBALL!!!!FOOTBALL!!!! Thank you Erik F.

52. Energy Transformations Activity PHSchool.com Enter Code: cgp-3053 Click the Active Art button to open a browser window and access Active Art about energy transformations. Chapter 9 Motion and Energy

53. Links on Energy PHSchool.com Enter Code: scn-1351 Click the SciLinks button for links on energy. Chapter 9 Motion and Energy

54. Links on Forms of Energy PHSchool.com Enter Code: scn-1352 Click the SciLinks button for links on forms of energy. Chapter 9 Motion and Energy

55. End of Section: Energy Chapter 9 Motion and Energy

56. QuickTake Quiz Click to start quiz. Chapter 9 Motion and Energy