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Chapter 2 Accelerated Motion

Chapter 2 Accelerated Motion. Acceleration. Acceleration is the rate of change In velocity. Velocity and Acceleration. Average acceleration is the Change in velocity during some Measurable time interval. v f – v i t f – t i. Δ v Δ t. a =. =. The SI unit for acceleration is

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Chapter 2 Accelerated Motion

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  1. Chapter 2 Accelerated Motion

  2. Acceleration Acceleration is the rate of change In velocity

  3. Velocity and Acceleration

  4. Average acceleration is the Change in velocity during some Measurable time interval. vf – vi tf – ti Δv Δt a = = The SI unit for acceleration is m/s2

  5. Problems... A sprinter begins a race at 0.0 m/s And finished at 4.0 m/s. He does This in a time of 8s. What is his acceleration? 0.5 m/s2

  6. Instantaneous acceleration is The change in velocity at An instant of time. A velocity-time graph is a graph That show velocity on the y-axis and time on the x-axis.

  7. The slope of a V-T graph will Give you acceleration.

  8. 3.2 Motion with Constant Acceleration There are a bunch of new formulas That can be found by deriving Them from the two basic formulas That we already know.

  9. Displacement with Constant Acceleration ΔX = ½ (vi +vf)Δt

  10. Problems... A racing car reaches a speed of 42 m/s. It then begins a uniform Negative acceleration, using its Parachute and brakes, and comes To a stop 5.5s later. Find how far The car moves while stopping. 120 m

  11. Velocity with Constant Acceleration vf = vi + aΔt Displacement with Constant Acceleration Δx = viΔt + ½a(Δt)2

  12. Problems... A plane starting at rest at one end Of a runway undergoes a constant Acceleration of 4.8 m/s2 for 15s Before takeoff. What is its speed at Takeoff? How long must the Runway be for the plane to Take off? 72 m/s 540 m

  13. Final Velocity after Any displacement vf2 = vi2 + 2aΔx

  14. Problems... A babysitter pushing a stroller Starts from rest and accelerates At 0.500 m/s2. What is the Velocity of the stroller after it Has traveled 4.75 m? 2.18 m/s

  15. Equations for constantly Accelerated straight line motion

  16. 3.3 Free Fall Free fall is the motion of an Object falling with a Constant Acceleration due To gravity.

  17. All free falling bodies undergo A uniform acceleration Of 9.81 m/s2. This acceleration, a, is given The new symbol, g.

  18. Problems... A construction worker accidentally Drops a brick from a high scaffold. What is the velocity of the brick After 4 seconds? How far does the Brick fall during this time? 78 m 39 m/s

  19. THE END

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