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Acceleration

Acceleration. What does it mean to accelerate anyway??. TO ACCELERATE YOU MUST CHANGE YOUR VELOCITY!! VELOCITY CHANGES IF…. 1. Increase Speed 2. Decrease Speed 3. Change Direction

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Acceleration

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  1. Acceleration

  2. What does it mean to accelerate anyway?? • TO ACCELERATE YOU MUST CHANGE YOUR VELOCITY!! • VELOCITY CHANGES IF…. • 1. Increase Speed • 2. Decrease Speed • 3. Change Direction • Acceleration- rate at which velocity changes over time; an object accelerates if its speed, direction, or both change • -any change in velocity • Why? Because velocity includes speed and direction

  3. 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.

  4. Acceleration Equations Acceleration= final velocity- starting velocity time Change in velocity = final – starting velocity velocity Acceleration= change in velocity time Acceleration = ∆velocity time SI units for acceleration = m/s2 , mi/h2 , km/h2

  5. When is it positive or negative acceleration? • *small acceleration → means speed is ↑ slowly • *large acceleration → means speed is ↑ rapidly • + acceleration- velocity is ↑ (obj. speeding up) • -ex. Pressing on gas pedal in a car • - acceleration- velocity is ↓ (obj. slowing down) • -ex. Pressing on the brake pedal in a car • Important- acceleration does not always mean “speeding up” b/c it’s any change in velocity

  6. Positive acceleration Negative acceleration

  7. - 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

  8. 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

  9. A car traveling at 60 mph slams on the breaks to avoid hitting a deer. The car comes to a safe stop 6 seconds after applying the breaks. 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

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