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Acceleration

Acceleration. (Mr. Giles’ car). The Big Race. Which car will finish first?. Acceleration. Any change in velocity or direction. Acceleration. Acceleration = rate of change in velocity Accel .= (final velocity – initial velocity)/time or a= ( v f – v i ) / t Units: a=m/s/s.

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Acceleration

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  1. Acceleration (Mr. Giles’ car)

  2. The Big Race Which car will finish first?

  3. Acceleration • Any change in velocity or direction

  4. Acceleration • Acceleration= rate of change in velocity Accel.= (final velocity – initial velocity)/time or a= (vf – vi) / t Units: a=m/s/s

  5. Acceleration(Practice Problem) • A roller coaster has a velocity of 10m/sec at the top of a hill. Two seconds later it reaches the bottom of the hill with a velocity of 20m/sec. What is the Acceleration of the roller coaster? • Acceleration=(Velocity final – Velocity initial)/time • Acc.=(20m/s – 10m/s)/2s • Acc.=5m/s/s

  6. If a car is traveling down the road and comes to a stop what is happening to the velocity? • Velocity is decreasing • If velocity is decreasing it means we have a change in velocity and therefore we can calculate accel. • This type of acceleration is also known as Deceleration or negative acceleration.

  7. Negative Acceleration(Deceleration Practice Problem) • A roller coaster is moving at 25m/s at the bottom of a hill. Three seconds later it reaches the top of the next hill, moving at 10m/s. What is the deceleration of the roller coaster? • Acceleration=(Velocity final – Velocity initial)/time • Acc.=(10m/s – 25m/s)/3s • Acc.= -5m/s/s

  8. Graphing Acceleration What would the graph look like of these three cars??? Blue Car Red Car Green Car

  9. Graphing Acceleration(Rightward + Changing Velocity) What would the graph of this car look like???

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