Velocity Explain why we say all 3 cars are changing their velocity.
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Transcript of Velocity Explain why we say all 3 cars are changing their velocity.
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Velocity
Explain why we say all 3 cars are changing their velocity
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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!
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Acceleration
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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
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Something to rememberA positive value for
acceleration shows speeding up
and negative value for acceleration shows slowing down
The correct terms are positive and negative acceleration
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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?
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Problem #1 Looking forAcceleration
GivenVelocityinitial = 2.0 m/sVelocityfinal = 10.0
m/sTime = 3 seconds
Relationship
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Problem #2 A car accelerates
at a rate of 3.0 m/s2. 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?
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Problem #2 Looking for Time GivenVelocitylinitial = 8.0
m/s; Velocityfinal = 25.0 m/s
Acceleration = 3.0 m/s2
Relationship