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TEK 8.6 Force, motion, and energy

The student knows that there is a relationship between force, motion, and energy. TEK 8.6 Force, motion, and energy. TEK 8.6 Student Expectations. A) Demonstrate and calculate how unbalanced forces change the speed or direction of an object's motion.

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TEK 8.6 Force, motion, and energy

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  1. The student knows that there is a relationship between force, motion, and energy. TEK 8.6 Force, motion, and energy

  2. TEK 8.6 Student Expectations A) Demonstrate and calculate how unbalanced forces change the speed or direction of an object's motion. B) Differentiate between speed, velocity and acceleration. C) Investigate and describe applications of Newton’s law of inertia, law of force and acceleration, and law of action-reaction such as in vehicle restraints, sports activities, amusement park rides, Earth’s tectonic activities, and rocket launches.

  3. Balanced/Unbalanced Forces Mini-Poster (Use One Page Notes Format) TX Science Fusion pgs. 186-194Must Include: • Definition of Force • Definition of Balanced and Unbalanced Forces • Draw original examples of balanced and unbalanced forces. • Define Net Forces • Give and Draw Example of Net Forces • Label the size (in Newtons) and direction (with arrow) of the forces. • Calculate the direction and net Force resulting on the object.

  4. PAP Force Project • Define and give example of Force • Define and give example of balanced force • Define and give example of unbalanced force • Define and give example of Net Force • Newton’s 2nd law of Motion • Montage Title, credits, music, and editing.

  5. Balanced/Unbalanced Forces Foldable Rubric • Definition of balanced or unbalanced force • Original Drawing • Force magnitude and direction is labeled • Net Force is shown • Color

  6. -a push or a pull -has a magnitude (size) and a direction -measured in newtons (N) -newtons = kg x m/s2 Force

  7. Force Force = mass x acceleration F = m x a Units: Newtons (N) F m a

  8. -The amount of matter in an object. -measured in kilograms (kg) Mass

  9. -Rate of change of velocity -measured in meter/second2 (m/s2) Acceleration

  10. Balanced Force -describes forces that are equal but opposite in direction -results in no motion

  11. Unbalanced Force -describes unequal forces acting on an object -results in motion in the direction of the greater force

  12. Net Force -the sum of all the forces acting on an object.

  13. Same Direction Forces -if forces are in the same direction add forces. Fnet=F1 + F2 5 N 6 N 11 N To the left

  14. Opposite Direction Forces -if forces are in the opposite directions subtract smaller from larger. Fnet = F1 – F2 5 N 10 N 5 N To the right

  15. Example 10 N 25 N Up 15 N

  16. Example 10 N 0 N Balanced 10 N

  17. Quiz #5 • A push or a pull. • Forces that are equal but opposite in direction and result in no motion. • Describes unequal forces acting on an object resulting in a change in the object’s motion in the direction of the larger force.

  18. Identify if the forces are balanced or unbalanced. 4. 5. 250 N 250 N Bonus: The sum of all the forces acting on an object.

  19. Quiz #6 1. Which contestant will win the arm wrestling contest. Pepe 50 N Jose 60 N

  20. 2. Who wins the tug-o’-war? Paco Kiko

  21. 3. What is the net force on the rope? Paco Kiko

  22. 4. What is the net force being put on the box?

  23. What is the net force on the box and what direction will it move? 35N 10N 25 N 15 N 10 N 10 N 20 N 10 N 35N 15 N

  24. Bonus: Which way will the ball go?

  25. Net Force Worksheet Answers (Front Side) • 4N  • 4 N  • 0 N balanced • 5 N  • 7 N • 6 N • 6 N  • 4 N • 6 N •  • No motion

  26. Net Force Worksheet Answers (Back Side) • 1 N  • 1 N  • 6 N  • 0 N balanced • 4 N • 14 N • 5 N  • 3 N  • 6N •  •  •  • No motion

  27. 36=100 35=97 34= 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

  28. TEK 8.6 A) Demonstrate and calculate how unbalanced forces change the speed or direction of an object's motion. B) Differentiate between speed, velocity and acceleration. C) Investigate and describe applications of Newton’s law of inertia, law of force and acceleration, and law of action-reaction such as in vehicle restraints, sports activities, amusement park rides, Earth’s tectonic activities, and rocket launches.

  29. I feel the need… The need for speed!

  30. Speed -the distance traveled by an object in a given amount of time. speed = distance time -units = meters/second or m/s

  31. Speed Speed = distance / time s = d/t Units: unit of distance (meters, inches, miles) Unit of time (seconds, minutes, hours) d S t

  32. -speed of an object and its direction of motion Ex. 40 m/s to the North Velocity

  33. Graphing Motion

  34. Graphs • Graph the data • What is happening to the speed? • What would the line look like if there was no motion? • Write down the data set that would graph a stationary object.

  35. Constant Speed Graph

  36. Increasing Speed • Compare the speed at two different points. • Is speed constant?

  37. No Motion Graph

  38. Options for Distance-Time Graphs ? ? ?

  39. Acceleration -rate in change of velocity Acceleration measures how an object changes velocity by either moving faster, slower, or changing direction.

  40. Acceleration -Acceleration = Final speed – Initial speed time a=sF-sI or a=vF-vI t t

  41. Graph the data • What is happening to the acceleration? • What would the line look like if acceleration was 0m/s2?

  42. Velocity/Speed Graphs Velocity (m/s) Velocity (m/s)

  43. Velocity (or Speed) vs. Time Graphs • There is something about a line graph that makes people think they're looking at the path of an object. A common beginner's mistake is to look at the graph to the right and think that the the v = 9.0 m/s line corresponds to an object that is "higher" than the other objects. Don't think like this. It's wrong. • In this case, higher means faster.

  44. Options for Velocity (Speed)-Time Graphs Acceleration

  45. Motion Graphs Quiz 1. What is the speed of this graph? a) No motion b) Constant c) Increasing 2. What is the acceleration on this graph? a) Increasing b) constant c) no acceleration Distance Time

  46. Motion Graphs Quiz 3. What is happening in this graph? a) No motion b) Constant speed c) Increasing speed 4. What is the acceleration on this graph? a) Increasing b) constant c) no acceleration Velocity m/s Time s

  47. 5. Ms. Berrios and her boys travel to California for summer vacation. They travel 800 miles on Interstate-10 West in 10 hours. What is Ms. Berrios’ velocity? Do not forget your units!

  48. Bonus: What is the Net Force?

  49. Lottery Quiz #3 Mr. McDonald travels with his family to California. The car has a mass of 1500 kg. They travel at 33 m/s West for 1000 seconds. • What is Mr. McDonald’s family’s speed? • What is Mr. McDonald’s family’s velocity? • How far did Mr. McDonald’s family travel in that time? • What is the rate of change of velocity (not specifically in this scenario)? • What are the units of the rate of change of velocity?

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