# Velocity and Acceleration - PowerPoint PPT Presentation

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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?