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PPT – Velocity and Acceleration PowerPoint presentation | free to download - id: 12630-ZGNiN

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Velocity and Acceleration

Im the king of the world!!!! Woo-hoo!!!

Velocity

- Speed only describes how fast something is moving
- Velocity describes both speed AND direction!

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

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.

Change in velocity

- Speed may not always be constant.
- The velocity of an object may change, even if the

speed remains the same.

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.

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.

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

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

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?

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

Homework

- Questions 1-3 on page 67.
- Complete mini-lab
- Does greater velocity require greater

acceleration?