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Notes rb labs 3 and 4


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  • 1. Forces and Motion
  • 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. Forces and MotionLab 3 “Keep on Truckin’ ”;Pages 17-28Lab 4 “Laws of Motion”; Pages29 – 34
  • 4. Lab 3Keep on Truckin’Keep on Truckin’
  • 5. Key ObjectivesKey ObjectivesThe Student will:– Investigate and understandconcepts of speed, velocityand acceleration whendescribing motion.
  • 6. Key ObjectivesKey ObjectivesThe Student will:– Understand that velocitymeasures the average speedof an object in a specificdirection
  • 7. Key ObjectivesKey ObjectivesThe Student will:Take measurements tocalculate the speed of amoving object
  • 8. Key TermsKey TermsSpeedVelocityAcceleration
  • 9. SpeedSpeedThe change in position of anobject per unit of time:– Miles per hourMPH– Meters per SecondM/Sec
  • 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. AccelerationAccelerationThe increase in speed of anobject per unit of timeWritten in Meters per secondper secondM/sec2
  • 12. Essential LearningsEssential LearningsAverage speed is calculated bydividing distance by times = d/tSpeed = DistanceTime
  • 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. 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. Essential Learnings:Essential Learnings:Acceleration iscalculated bydividing thechange invelocity bytimea = vf – vita = accelerationvf = final velocityvi = initial velocityt = time
  • 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. Essential LearningsEssential LearningsA decrease in velocity isnegative acceleration– Deceleration
  • 18. Essential LearningsEssential LearningsObjects moving in a circularmotion are constantlyaccelerating because velocityand direction are constantlychanging
  • 19. Essential LearningsEssential LearningsA distance/timegraph foracceleration isalways a curve
  • 20. One More Thing… Constant Accelleration– Acceleration Plus and minus–
  • 21. Lab 4Newton’s 3 LawsNewton’s 3 Laws
  • 22. Watch This….. Newton’s Three Laws of Motion Newton’s Intro… Intro….–
  • 23. Key ObjectivesKey ObjectivesThe student will:– Investigate and understandthe effects of gravity andNewton’s laws of motion
  • 24. Key ObjectivesKey ObjectivesThe student will:– Define Force and distinguishbetween balanced andunbalanced forces
  • 25. Key ObjectivesKey ObjectivesThe student will:– Explain the effects ofbalanced and unbalancedforces on the motion of anobject
  • 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. Key ObjectivesKey ObjectivesThe student will:– Explain how force, mass andacceleration are related(Newton’s Second Law)
  • 28. Key ObjectivesKey ObjectivesThe student will:– Solve basic problems giventhe formula;Force = mass x acceleration(F=ma)
  • 29. Key ObjectivesKey ObjectivesThe student will:– Demonstrate action andreaction forces and how theyapply to motion(Newton’s Third Law)
  • 30. Key ObjectivesKey ObjectivesThe student will:– Explain how force and motionapply to car safety andtechnology, rockets andrestraining devices
  • 31. Key TermsKey TermsNewton’s First Law– InertiaNewton’s Second LawNewton’s Third LawBalanced ForcesUnbalanced Forces
  • 32. Newton’s First LawNewton’s First LawInertiaInertia– A body at restwill remain atrest until a forceacts upon itand…
  • 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. 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. Newton’s Second LawNewton’s Second Law“The accelerationof an objectdepends on themass of the objectand the amount offorce applied”
  • 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. Balanced ForcesBalanced ForcesWhen forces are equal orbalanced no change in themotion of an object will beobserved
  • 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. 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. 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. 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. 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. Essential LearningsEssential Learnings– Note that:Only an unbalanced forcecan change an objectsmotion
  • 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. Newton’s Laws ReviewNewton’s Laws Review
  • 46. Newton’s Law SongNewton’s Law Song
  • 47. Finally….Finally….
  • 48. FormulaeFormulaeForceF= maF= Forcem=Massa = acceleration
  • 49. Formulae (Formulas)Formulae (Formulas)Accelerationa=Vf – Vita = acceleration t = timeVf = Final VelocityVi = Initial Velocity
  • 50. FormulaeFormulaeDistanced= r x ts = speedr= rated=Distance
  • 51. Essential LearningsThe End!