# Understanding Acceleration and Velocity

This article explains the concept of acceleration as a measure of an object's change in velocity over a period of time. It also defines velocity as a description of an object's speed and direction of travel.

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## About Understanding Acceleration and Velocity

PowerPoint presentation about 'Understanding Acceleration and Velocity'. This presentation describes the topic on This article explains the concept of acceleration as a measure of an object's change in velocity over a period of time. It also defines velocity as a description of an object's speed and direction of travel.. The key topics included in this slideshow are . Download this presentation absolutely free.

## Presentation Transcript

Slide1Acceleration

Slide2Acceleration1. 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?

Slide3Example• If something falls, it will accelerate. • As time goes by, the ball increases its speed continuously.

Slide43 Ways to change Acceleration1. 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!

Slide5Does moving Ferris Wheel demonstrateacceleration?  Why or why not? YES!  The Ferris Wheel constantly changes its direction, so it is accelerating

Slide6Does this picture demonstrateacceleration?  Why or why not? YES!  The baseball’s direction of travel has changed as well as its speed.

Slide7Does this picture demonstrate acceleration?  Whyor why not? YES!  The horses change their speeds dramatically from zero.

Slide8Does this picture demonstrate acceleration?  Whyor why not? YES!  The car slowed down when it hit the pole, thus changing its speed negatively!

Slide9How 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)

Slide10How 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