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# Acceleration (1) notes

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### Transcript

• 1.
• When an object undergoes acceleration , its velocity changes.
• Acceleration the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change.
• Acceleration can be a change in speed or a change in direction .
• 2.
• When an object undergoes acceleration , its velocity changes.
• Positive acceleration is in the same direction as the motion and increases velocity.
• accelerates at 5 m/s/s
• upward.
• 3. Linear Acceleration
• When an object slows down it is losing speed. This is called Negative Acceleration or Deceleration .
• This is really acceleration in the backward direction.
• 4.
• Moving in a circle at constant speed is acceleration because you are constantly changing direction.
• The acceleration that occurs in a circular motion is known as centripetal acceleration .
• Stock cars are constantly accelerating around the
• track.
• 5.
• Equation acceleration = final velocity – initial velocity
• time
• what does this mean?
• Or a = v
• t
• Units of acceleration: m/s/s, m/s 2 , km/h/s, mi/hr/s
• The average acceleration over a given time interval can be calculated by dividing the change in the object’s velocity by the time over which the change occurs.
• 6.
• Natalie accelerates her skateboard along a straight path from 0 m/s to 4.0 m/s in 2.5 s. Find her average acceleration
• List what you know : Plug into your equation
• Fina l velocity = 4.0 m/s a= V final - V initial / time
• Initial velocity = 0 m/s 4.0 m/s – 0 m/s
• Time = 2.5 s 2.5 s
• Acceleration = ? A =
• 7. Practice Calculating Acceleration
• If Annie goes from 0m/s to 8 m/s in 1 sec. What is her acceleration?
• Tanner ran 0m/s to 10m/s in 1 sec. What is his acceleration?
• Sam’s new Mercedes goes from 0m/s to 30 m/s in 6 sec. What is its acceleration?
• Catlin’s jet accelerates from a stop to 76 m/s in 10 sec. What is its acceleration?
• 8. The top fuel cars are traveling 298.1 mph in 3.055 seconds, what is their acceleration?
• 9.
• 10.
• What is the acceleration at 3 seconds?
• What is the acceleration at 8 seconds?