Velocity Explain why we say all 3 cars are changing their velocity.

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Presentation transcript:

Velocity Explain why we say all 3 cars are changing their velocity

Sometimes we are interested in how fast the velocity of an object is changing 1) How fast is the car speeding up that is trying to pass me on the 2 lane road to Lubbock? 2) How fast did I slow down to avoid hitting the dog in the road? 3) How fast did the roller coaster go around the curve? b/c I am feeling sick!

Acceleration

Definition: the rate at which velocity is changing It can be a change in 1) velocity and/or 2) direction Formula: Acceleration= velocity final – velocity initial time Unit: 10 m/s or m/s² s

Something to remember A positive value for acceleration shows speeding up and negative value for acceleration shows slowing down The correct terms are positive and negative acceleration

Let’s try a few for physics fun A softball player increases her velocity from 2.0 m/s to 10.0 m/s in 3.0 seconds. What is her acceleration?

Problem #1 Looking for Acceleration Given Velocity initial = 2.0 m/s Velocityf inal = 10.0 m/s Time = 3 seconds Relationship

Problem #2 A car accelerates at a rate of 3.0 m/s 2. If its original speed is 8.0 m/s, how many seconds will it take the car to reach a final speed of 25.0 m/s?

Problem #2 Looking for Time Given Velocityl initial = 8.0 m/s; Velocity final = 25.0 m/s Acceleration = 3.0 m/s 2 Relationship