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Velocity and Acceleration

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The Ferrari is traveling west while the Lamborghini is traveling east. ... Ferrari's v is greater. b. Lamborghini's v is greater. c. Their velocities are the same ... – PowerPoint PPT presentation

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Title: Velocity and Acceleration


1
Velocity and Acceleration
Im the king of the world!!!! Woo-hoo!!!
2
Velocity
  • Speed only describes how fast something is moving
  • Velocity describes both speed AND direction!

3
Velocity
  • Concep question
  • Picture two sports cars racing down the highway.
    The Ferrari is traveling west while the
    Lamborghini is traveling east. They both have a
    speed of 100km/h. What can you conclude about
    their velocities?
  • Ferraris v is greater
  • b. Lamborghinis v is greater
  • c. Their velocities are the same
  • d. Their velocities are different

4
Velocity
  • The answer is d. Both cars have the same speed,
    however the direction in which they are traveling
    is different. Their velocities are different
    because their directions are different.

5
Change in velocity
  • Speed may not always be constant.
  • The velocity of an object may change, even if the
    speed remains the same.

6
Acceleration
  • Acceleration is the rate of change of velocity
  • Velocity includes both speed and direction,
    therefore acceleration is both the rate of change
    in velocity and direction of that change.

7
Acceleration
  • If acceleration is in the same direction as the
    object, the objects speeds up.
  • If acceleration is the opposite direction as the
    object, the object slows down.

8
Acceleration
  • Acceleration also depends on the time interval.
  • To calculate the acceleration of an object,
    divide the change in velocity by the time.
  • avf-vi or ?v
  • t t

9
Acceleration Units
  • The unit for velocity is meters / second m/s
  • The unit for time is seconds (s)
  • Therefore, the unit for acceleration is
    meters/seconds m/s2
  • seconds
  • Meters per second squared

10
Acceleration Sample Problem
  • A race car sits at the starting line at Atco
    raceway. The light turns green and the driver
    presses the pedal to the metal. The velocity
    changes from 0 m/s to 60m/s in 6 seconds. What
    is the acceleration of the car?

11
Solution
  • List the known information
  • initial velocity (vi) 0 m/s
  • Final velocity (vf) 60 m/s
  • Time 6 seconds
  • A 60m/s 0 m/s 10 m/s2
  • 6 s

12
Homework
  • Questions 1-3 on page 67.
  • Complete mini-lab…
  • Does greater velocity require greater
    acceleration?
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