On October 23rd, 2014, we updated our
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Key ObjectivesKey ObjectivesThe Student will:– Investigate and understandconcepts of speed, velocityand acceleration whendescribing motion.
Key ObjectivesKey ObjectivesThe Student will:– Understand that velocitymeasures the average speedof an object in a specificdirection
Key ObjectivesKey ObjectivesThe Student will:Take measurements tocalculate the speed of amoving object
Key TermsKey TermsSpeedVelocityAcceleration
SpeedSpeedThe change in position of anobject per unit of time:– Miles per hourMPH– Meters per SecondM/Sec
VelocityVelocityThe measurementof the speed of anobject in a specificdirectionN, NE, E, SE, W ,NW,, S, SW, North Northeast East Southeast West Northwest South Southwest
AccelerationAccelerationThe increase in speed of anobject per unit of timeWritten in Meters per secondper secondM/sec2
Essential LearningsEssential LearningsAverage speed is calculated bydividing distance by times = d/tSpeed = DistanceTime
Essential LearningsEssential LearningsVelocity describes both thespeed and the direction of themotion of an objectIt is reported in meters persecond (m/sec) in a specificdirection (m/sec N, E,W or S)
Essential LearningsEssential LearningsAcceleration is the change invelocity per unit of time– m/sec2(meters per second per second)An object moving with constantspeed/velocity has noacceleration
Essential LearningsEssential LearningsOn earth weight in Newtons is~10 your mass in KiligramsOn earth, acceleration due tothe force of gravity is:9.8 m/sec2(meters per second persecond)
Essential LearningsEssential LearningsA decrease in velocity isnegative acceleration– Deceleration
Essential LearningsEssential LearningsObjects moving in a circularmotion are constantlyaccelerating because velocityand direction are constantlychanging
Essential LearningsEssential LearningsA distance/timegraph foracceleration isalways a curve
One More Thing… Constant Accelleration– http://www.youtube.com/watch?v=BGfPU_gyqm8 Acceleration Plus and minus– http://www.youtube.com/watch?v=ixF_Tf4pmE8
Lab 4Newton’s 3 LawsNewton’s 3 Laws
Watch This….. Newton’s Three Laws of Motion Newton’s Intro… Intro….– http://www.youtube.com/watch?v=UVdqxYyFRKY
Key ObjectivesKey ObjectivesThe student will:– Investigate and understandthe effects of gravity andNewton’s laws of motion
Key ObjectivesKey ObjectivesThe student will:– Define Force and distinguishbetween balanced andunbalanced forces
Key ObjectivesKey ObjectivesThe student will:– Explain the effects ofbalanced and unbalancedforces on the motion of anobject
Key ObjectivesKey ObjectivesThe student will:– Identify situations that illustrateeach law of motionGive examples of the effectsof Inertia(Newton’s First Law)
Key ObjectivesKey ObjectivesThe student will:– Explain how force, mass andacceleration are related(Newton’s Second Law)
Key ObjectivesKey ObjectivesThe student will:– Solve basic problems giventhe formula;Force = mass x acceleration(F=ma)
Key ObjectivesKey ObjectivesThe student will:– Demonstrate action andreaction forces and how theyapply to motion(Newton’s Third Law)
Key ObjectivesKey ObjectivesThe student will:– Explain how force and motionapply to car safety andtechnology, rockets andrestraining devices
Key TermsKey TermsNewton’s First Law– InertiaNewton’s Second LawNewton’s Third LawBalanced ForcesUnbalanced Forces
Newton’s First LawNewton’s First LawInertiaInertia– A body at restwill remain atrest until a forceacts upon itand…
Newton’s First LawNewton’s First Law“A body will remainin motion andtravel in a straightpath and constantspeed until a forceacts upon it.”
Newton’s First LawNewton’s First LawInertiaInertia- Often calledthe “Lazy Law”…itsays things do whatthey are doing untila force causes achange to occur
Newton’s Second LawNewton’s Second Law“The accelerationof an objectdepends on themass of the objectand the amount offorce applied”
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
Balanced ForcesBalanced ForcesWhen forces are equal orbalanced no change in themotion of an object will beobserved
Unbalanced ForcesUnbalanced ForcesWhen forces are unequal orunbalanced, a change in themotion of an object can beobserved:– Bowling ball collides with a tennisball
Essential LearningsEssential LearningsSir Isaac Newton (1642 –1727) The “Father of Calculus”and one of the greatestPhysicists everThrough observations andcalculations discovered threelaws of motion.
Essential LearningsEssential LearningsNewton’s first law (Inertia)states:– Any object at rest will remainat rest until a force acts uponit to change the objectsposition/motion.
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..
Essential LearningsEssential LearningsNewton’s second law :– F=ma– The acceleration of an objectis determined by the mass ofthe object and the amount offorce needed to change thespeed
Essential LearningsEssential Learnings– Note that:Only an unbalanced forcecan change an objectsmotion
Essential LearningsEssential LearningsNewton’s third law :– For every action there is anequal and opposite reaction.– Often calledAction ReactionCause and Effect