velocity explain why we say all 3 cars are changing their velocity
DESCRIPTION
AccelerationTRANSCRIPT
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
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 rememberA 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 forAcceleration
GivenVelocityinitial = 2.0 m/sVelocityfinal = 10.0
m/sTime = 3 seconds
Relationship
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?
Problem #2 Looking for Time GivenVelocitylinitial = 8.0
m/s; Velocityfinal = 25.0 m/s
Acceleration = 3.0 m/s2
Relationship