What is acceleration Acceleration  is the rate at which velocity changes over time. An Object will accelerate if its speed, direction of motion or both.

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Presentation transcript:

What is acceleration Acceleration  is the rate at which velocity changes over time. An Object will accelerate if its speed, direction of motion or both change.

Acceleration

Acceleration of a car

Acceleration of object being Thrown and Falling

Acceleration Data Graphed!

Formula for Acceleration Acceleration = (Velocity (final) – Velocity (Initial) ) time of change Units for acceleration are m/s/s or m/s 2

Acceration Example In 1970, Don “Big Daddy” Garlits set what was then the world record for drag racing. He started at rest and accelerated at 16.5 m/s 2 for 6.5 s. What was Garlits’s final speed? v f = (16.5 m/s 2 x 6.5 s) +0 m/s v f =110 m/s

Acceration Example 2 A child sleds down a steep, snow-covered hill with an acceleration of 2.82 m/s 2. If her initial speed is 0.0 m/s and her final speed is 15.5 m/s, how long does it take her to travel from the top of the hill to the bottom? t = (V f -V i )/a

Acceration Example #2 An automobile manufacturer claims that its latest model can “go from 0 to 90” in 7.5 s. If the “90” refers to 90.0 km/h (or 25.0 m/s), calculate the automobile’s acceleration in m/s 2. Acc =  v/t = (v f – v i )/t Acc = (25.0 m/s m/s)/7.5 s Acc = 3.3 m/s 2

Acceleration Equations