Notes rb labs 3 and 4


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Notes rb labs 3 and 4

  1. 1. Forces and Motion
  2. 2. Forces and Motion Lab 1 “Graphing Your Motion”; Pages 1-7 Lab 2 “Gravity’s Pull”; Pages 9 – 16 Lab 3 “Keep on Truckin’ ”; Pages 15 – 28 Lab 4 “Laws of Motion”; Pages 29 – 34 Lab 5 “ Work Made Easy”; Pages 41 – 56 Lab 6 “ Power to do Work”; Pages 57 – Lab 7 “ The Force of Friction”; Pages 35 -40
  3. 3. Forces and MotionLab 3 “Keep on Truckin’ ”;Pages 17-28Lab 4 “Laws of Motion”; Pages29 – 34
  4. 4. Lab 3Keep on Truckin’Keep on Truckin’
  5. 5. Key ObjectivesKey ObjectivesThe Student will:– Investigate and understandconcepts of speed, velocityand acceleration whendescribing motion.
  6. 6. Key ObjectivesKey ObjectivesThe Student will:– Understand that velocitymeasures the average speedof an object in a specificdirection
  7. 7. Key ObjectivesKey ObjectivesThe Student will:Take measurements tocalculate the speed of amoving object
  8. 8. Key TermsKey TermsSpeedVelocityAcceleration
  9. 9. SpeedSpeedThe change in position of anobject per unit of time:– Miles per hourMPH– Meters per SecondM/Sec
  10. 10. VelocityVelocityThe measurementof the speed of anobject in a specificdirectionN, NE, E, SE, W ,NW,, S, SW, North Northeast East Southeast West Northwest South Southwest
  11. 11. AccelerationAccelerationThe increase in speed of anobject per unit of timeWritten in Meters per secondper secondM/sec2
  12. 12. Essential LearningsEssential LearningsAverage speed is calculated bydividing distance by times = d/tSpeed = DistanceTime
  13. 13. Essential LearningsEssential LearningsVelocity describes both thespeed and the direction of themotion of an objectIt is reported in meters persecond (m/sec) in a specificdirection (m/sec N, E,W or S)
  14. 14. Essential LearningsEssential LearningsAcceleration is the change invelocity per unit of time– m/sec2(meters per second per second)An object moving with constantspeed/velocity has noacceleration
  15. 15. Essential Learnings:Essential Learnings:Acceleration iscalculated bydividing thechange invelocity bytimea = vf – vita = accelerationvf = final velocityvi = initial velocityt = time
  16. 16. Essential LearningsEssential LearningsOn earth weight in Newtons is~10 your mass in KiligramsOn earth, acceleration due tothe force of gravity is:9.8 m/sec2(meters per second persecond)
  17. 17. Essential LearningsEssential LearningsA decrease in velocity isnegative acceleration– Deceleration
  18. 18. Essential LearningsEssential LearningsObjects moving in a circularmotion are constantlyaccelerating because velocityand direction are constantlychanging
  19. 19. Essential LearningsEssential LearningsA distance/timegraph foracceleration isalways a curve
  20. 20. One More Thing… Constant Accelleration– Acceleration Plus and minus–
  21. 21. Lab 4Newton’s 3 LawsNewton’s 3 Laws
  22. 22. Watch This….. Newton’s Three Laws of Motion Newton’s Intro… Intro….–
  23. 23. Key ObjectivesKey ObjectivesThe student will:– Investigate and understandthe effects of gravity andNewton’s laws of motion
  24. 24. Key ObjectivesKey ObjectivesThe student will:– Define Force and distinguishbetween balanced andunbalanced forces
  25. 25. Key ObjectivesKey ObjectivesThe student will:– Explain the effects ofbalanced and unbalancedforces on the motion of anobject
  26. 26. Key ObjectivesKey ObjectivesThe student will:– Identify situations that illustrateeach law of motionGive examples of the effectsof Inertia(Newton’s First Law)
  27. 27. Key ObjectivesKey ObjectivesThe student will:– Explain how force, mass andacceleration are related(Newton’s Second Law)
  28. 28. Key ObjectivesKey ObjectivesThe student will:– Solve basic problems giventhe formula;Force = mass x acceleration(F=ma)
  29. 29. Key ObjectivesKey ObjectivesThe student will:– Demonstrate action andreaction forces and how theyapply to motion(Newton’s Third Law)
  30. 30. Key ObjectivesKey ObjectivesThe student will:– Explain how force and motionapply to car safety andtechnology, rockets andrestraining devices
  31. 31. Key TermsKey TermsNewton’s First Law– InertiaNewton’s Second LawNewton’s Third LawBalanced ForcesUnbalanced Forces
  32. 32. Newton’s First LawNewton’s First LawInertiaInertia– A body at restwill remain atrest until a forceacts upon itand…
  33. 33. Newton’s First LawNewton’s First Law“A body will remainin motion andtravel in a straightpath and constantspeed until a forceacts upon it.”
  34. 34. Newton’s First LawNewton’s First LawInertiaInertia- Often calledthe “Lazy Law”…itsays things do whatthey are doing untila force causes achange to occur
  35. 35. Newton’s Second LawNewton’s Second Law“The accelerationof an objectdepends on themass of the objectand the amount offorce applied”
  36. 36. Newton’s Third LawNewton’s Third Law“Whenever one objectexerts a force on another,the second object exertsan equal and oppositeforce on the first”ActionAction  Reaction orReaction orCauseCause EffectEffect
  37. 37. Balanced ForcesBalanced ForcesWhen forces are equal orbalanced no change in themotion of an object will beobserved
  38. 38. Unbalanced ForcesUnbalanced ForcesWhen forces are unequal orunbalanced, a change in themotion of an object can beobserved:– Bowling ball collides with a tennisball
  39. 39. Essential LearningsEssential LearningsSir Isaac Newton (1642 –1727) The “Father of Calculus”and one of the greatestPhysicists everThrough observations andcalculations discovered threelaws of motion.
  40. 40. Essential LearningsEssential LearningsNewton’s first law (Inertia)states:– Any object at rest will remainat rest until a force acts uponit to change the objectsposition/motion.
  41. 41. Essential LearningsEssential Learnings– In addition, any moving objectwill remain in motion at aconstant speed and in astraight line until anotherforce acts upon it to changeits motion..
  42. 42. Essential LearningsEssential LearningsNewton’s second law :– F=ma– The acceleration of an objectis determined by the mass ofthe object and the amount offorce needed to change thespeed
  43. 43. Essential LearningsEssential Learnings– Note that:Only an unbalanced forcecan change an objectsmotion
  44. 44. Essential LearningsEssential LearningsNewton’s third law :– For every action there is anequal and opposite reaction.– Often calledAction  ReactionCause and Effect
  45. 45. Newton’s Laws ReviewNewton’s Laws Review
  46. 46. Newton’s Law SongNewton’s Law Song
  47. 47. Finally….Finally….
  48. 48. FormulaeFormulaeForceF= maF= Forcem=Massa = acceleration
  49. 49. Formulae (Formulas)Formulae (Formulas)Accelerationa=Vf – Vita = acceleration t = timeVf = Final VelocityVi = Initial Velocity
  50. 50. FormulaeFormulaeDistanced= r x ts = speedr= rated=Distance
  51. 51. Essential LearningsThe End!