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Acceleration
 

Acceleration

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    Acceleration Acceleration Presentation Transcript

    • Acceleration
    • Change in Velocity
      Each time you take a step you are changing the velocity of your body.
      You are probably most familiar with the velocity changes of a moving bus or car.
      The rate at which velocity (speed or direction) changes occur is called acceleration.
    • Acceleration= final velocity- starting velocity
      time
      Change in velocity = final – starting velocity velocity
      Acceleration= change in velocity
      time
    • A car traveling at 60 mph accelerates to
      90 mph in 3 seconds. What is the
      car’s acceleration?
      Velocity(final) - Velocity(original)
      =
      Acceleration
      time
      90 mph - 60 mph
      =
      3 seconds
      30 mph
      =
      3 seconds
      =
      10 mph/second
    • Positive acceleration
      Negative acceleration
    • A car traveling at 60 mph slams on the brakes to
      avoid hitting a deer. The car comes to a safe stop
      6 seconds after applying the brakes. What is the
      car’s acceleration?
      Velocity(final) - Velocity(original)
      =
      Acceleration
      time
      0 mph - 60 mph
      =
      6 seconds
      - 60 mph
      =
      6 seconds
      =
      - 10 miles per hour per second
    • - A constant acceleration produces a straight line or linear slope (rise/run). - The slope of a non-linear velocity-time graph (rise/run) will predict an objects instantaneous acceleration. a = v/t
    • Free fall
      The constant acceleration of an object moving only under the force of gravity is "g".
      The acceleration caused by gravity is 10 m/s2
      If there was no air, all objects would fall at the same speed
      Doesn’t depend on mass
      After 1 second falling at 10 m/s
      After 2 seconds 20 m/s
      3 seconds 30 m/s
    • Falling
      Air resistance will increase as it falls faster
      An upward force on the object
      Eventually gravity will balance with air resistance
      Reaches terminal velocity - highest speed reached by a falling object.
    • Terminal velocity
      Force of gravity is constant
      • air resistance increases as you speed up
      • until the force is equal
      • Equal forces, no acceleration
      • constant velocity terminal velocity
    • Balloon Racers
      What will happen if I let go of the blown up balloon?
      Why did that happen?
      How can we measure the speed, distance or acceleration of the balloon?
      A track?
      Attach the balloon to something?