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# Ppt Acceleration

## by ffiala on Oct 10, 2009

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## Ppt AccelerationPresentation Transcript

• Acceleration
• What is Acceleration?
• Speed is the rate of change of position.
• Acceleration is the rate of change of velocity.
• What does that mean it has?
• HINT
• Acceleration Hints!
• Because velocity includes speed and direction of an object, acceleration can be a change in:
• How fast the object is moving
• What direction the object is moving
• Acceleration occurs when an objects changes its speed or direction, or both!
• Speeding up or Slowing down?
• When a car speeds up, that is POSITIVE ACCELERATION!
• When a car slows down, that is NEGATIVE ACCELERATION or DECELERATION!
• Acceleration Formula
• Acceleration = Change in Velocity/Time
• a=(Final Velocity-Initial Velocity)/Time
• a=(V f -V i )/t
• Positive Acceleration
• A motorcycle starts at rest and accelerates to 80 m/s in 20 seconds
• a=(V f -V i )/t = (80 m/s – 0 m/s) / 20s
• a= 4 m/s 2
• Positive Acceleration Graph
• Negative Acceleration/Deceleration
• A skateboarder moves in a straight line at 3 m/s and comes to a stop in 2 s.
• a=(V f -V i )/t = (0 m/s – 3 m/s)/2s
• a= -1.5 m/s 2
• Deceleration Graph