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Acceleration. 1.A measure of an object’s CHANGE in velocity over a period of time. 2.Velocity is a description of an object’s speed AND direction of travel.

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Presentation on theme: "Acceleration. 1.A measure of an object’s CHANGE in velocity over a period of time. 2.Velocity is a description of an object’s speed AND direction of travel."— Presentation transcript:

1 Acceleration

2 1.A measure of an object’s CHANGE in velocity over a period of time. 2.Velocity is a description of an object’s speed AND direction of travel. How does the rollercoaster’s velocity change over time?

3 Example If something falls, it will accelerate. As time goes by, the ball increases its speed continuously.

4 3 Ways to change Acceleration 1.Speed up - gets faster as time goes by 2.Slow down – gets slower as time goes by--this is called deceleration. 3.Change direction – remember velocity includes a direction, so if an object turns, we can say it is accelerating too!

5 Does moving Ferris Wheel demonstrate acceleration? Why or why not? YES! The Ferris Wheel constantly changes its direction, so it is accelerating

6 Does this picture demonstrate acceleration? Why or why not? YES! The baseball’s direction of travel has changed as well as its speed.

7 Does this picture demonstrate acceleration? Why or why not? YES! The horses change their speeds dramatically from zero.

8 Does this picture demonstrate acceleration? Why or why not? YES! The car slowed down when it hit the pole, thus changing its speed negatively!

9 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/s 2 (sometimes written m/s/s)

10 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 (V f ) – Velocity Initial (V i ) Time


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