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Acceleration

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**How does the rollercoaster’s velocity change over time?**

Acceleration A measure of an object’s CHANGE in velocity over a period of time. Velocity is a description of an object’s speed AND direction of travel. How does the rollercoaster’s velocity change over time?

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**Example If something falls, it will accelerate.**

As time goes by, the ball increases its speed continuously.

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**3 Ways to change Acceleration**

Speed up - gets faster as time goes by Slow down – gets slower as time goes by--this is called deceleration. Change direction – remember velocity includes a direction, so if an object turns, we can say it is accelerating too!

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**Does moving Ferris Wheel demonstrate acceleration? Why or why not?**

YES! The Ferris Wheel constantly changes its direction, so it is accelerating

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**Does this picture demonstrate acceleration? Why or why not?**

YES! The baseball’s direction of travel has changed as well as its speed.

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**Does this picture demonstrate acceleration? Why or why not?**

YES! The horses change their speeds dramatically from zero.

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**Does this picture demonstrate acceleration? Why or why not?**

YES! The car slowed down when it hit the pole, thus changing its speed negatively!

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**How is Acceleration Measured?**

Acceleration is a measure of SPEED in a certain TIME…so the units include both speed and time units. For example: Meters/sec every second….or m/s2 (sometimes written m/s/s)

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**How to Calculate Acceleration**

Since acceleration is a change in velocity over time, the formula looks like this: a = Velocity Time If we expand, we get: a = Velocity Final (Vf) – Velocity Initial (Vi) Time

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Chapter 4. Acceleration is the rate at which velocity changes. **Note: because acceleration depends upon velocity, it is a vector quantity. It has both.

Chapter 4. Acceleration is the rate at which velocity changes. **Note: because acceleration depends upon velocity, it is a vector quantity. It has both.

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