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Velocity and Acceleration. I’m the king of the world!!!! Woo-hoo!!!. Velocity. Speed only describes how fast something is moving Velocity describes both speed AND direction!. Velocity. Concep question:

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## Velocity and Acceleration

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**Velocity and Acceleration**I’m the king of the world!!!! Woo-hoo!!!**Velocity**• Speed only describes how fast something is moving • Velocity describes both speed AND direction!**Velocity**• Concep question: Picture two sports cars racing down the highway. The Ferrari is traveling west while the Lamborghini is traveling east. They both have a speed of 100km/h. What can you conclude about their velocities? • Ferrari’s v is greater b. Lamborghini’s v is greater c. Their velocities are the same d. Their velocities are different**Velocity**• The answer is d. Both cars have the same speed, however the direction in which they are traveling is different. Their velocities are different because their directions are different.**Change in velocity**• Speed may not always be constant. • The velocity of an object may change, even if the speed remains the same.**Acceleration**• Acceleration is the rate of change of velocity • Velocity includes both speed and direction, therefore acceleration is both the rate of change in velocity and direction of that change.**Acceleration**• If acceleration is in the same direction as the object, the objects speeds up. • If acceleration is the opposite direction as the object, the object slows down.**Acceleration**• Acceleration also depends on the time interval. • To calculate the acceleration of an object, divide the change in velocity by the time. a=vf-vi or Δv t t**Acceleration Units**• The unit for velocity is meters / second m/s • The unit for time is seconds (s) • Therefore, the unit for acceleration is meters/seconds = m/s2 seconds “Meters per second squared”**Acceleration Sample Problem**• A race car sits at the starting line at Atco raceway. The light turns green and the driver presses the pedal to the metal. The velocity changes from 0 m/s to 60m/s in 6 seconds. What is the acceleration of the car?**Solution:**• List the known information: initial velocity (vi): 0 m/s Final velocity (vf): 60 m/s Time: 6 seconds A= 60m/s – 0 m/s = 10 m/s2 6 s**Homework:**• Questions 1-3 on page 67. • Complete mini-lab… Does greater velocity require greater acceleration?

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