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# Velocity & Acceleration

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## Nicole Stetzer

on 7 January 2013

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#### Transcript of Velocity & Acceleration

By: Jerome White, Andre Fuller, Nicole Stetzer, Clare Tavani, and Emma
Honeycutt Velocity Acceleration Velocity is the speed of an object in a certain direction, not to be confused with speed.
The key difference with velocity is the fact that it features a direction; for example, an object going 5 km/h is an example of speed, but an object going 5 km/h south is an example of velocity.
To measure velocity in the same direction, you must add the two velocities together. For example, if you are on a train that is flying and you get up and walk towards the front, you will add the velocity of yourself and of the plane. Velocity & Acceleration Acceleration Acceleration is the rate at which velocity changes over time.
An object can either accelerate, a positive acceleration, or decelerate if it's a negative acceleration.
Besides being the rate at which velocity changes, acceleration is also how fast velocity becomes over time; the faster the velocity is, the larger the acceleration is. Velocity Continued However, say you're walking towards the back of the plane. Then, instead of adding the velocities, you would subtract them.
(The plane going at 15 m/s east
minus you walking 1 m/s west for
14 m/s east.) Measuring Velocity & Acceleration Velocity's formula is m/s plus direction
Acceleration's formula is: average acceleration= final velocity-starting velocity/ time it takes to change velocity What this picture means is that acceleration
doesn't depend on whether an object
is speeding up or slowing down; it
depends on whether its rate is
changing, so even though something is slowing down it's still an example of acceleration, albeit negative. For example, a bike that started at
1 m/s south and ends at 5 m/s south, but only changes velocity at 4 m/s would have
an acceleration of 1 m/s^2. Circular Motion (Acceleration) Circular motion is an example of acceleration happening all the time. How is this possible? As the earth rotates, you travel in a circle constantly, which is a constant change in velocity.
The acceleration of of circular motion is called centripetal acceleration.
Another example of centripetal acceleration is a Ferris wheel fairs or even in windmills constantly rotating. Examples of Acceleration Some examples of acceleration include:
-A car speeding up and down at different stoplights on the road, decelerating and accelerating
-A track runner speeding up and down as he gets more
and less tired as he runs on a track heading north Instantaneous Acceleration Instantaneous velocity is the speed of an object in a direction at a split second in time.
An example of this and when it would be needed is when a car is driving over a manhole, where it's velocity is 1 km/h south; it would be key to know when it slows down. Graphing Acceleration Acceleration being graphed is different from normal graphs of change over time; for example:
-A roller coaster accelerating as it moves up a hill until it stops will be a line going up on a graph, but as it reaches the top, it'll shoot down the hill, where velocity decreases as it goes down the hill. Bibliography - "Acceleration." The Physics Classroom. Physics Classroom, n.d. Web. 29 Nov. 2012. <http://www.physicsclassroom.com/Class/1DKin/U1L1e.cfm>.
- "Acceleration, Velocity, and Position." UBC. N.p., n.d. Web. 8 Dec. 2012. <http://www.ugrad.math.ubc.ca/coursedoc/math101/notes/applications/
velocity.html>.
- Physical Science. Austin, Texas: Holt, Rinehart and Winston, 2008. Print.
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