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Sec.3 acceleration

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Sec.3 acceleration

1. 1. Acceleration
2. 2. Change in Velocity• Each time you take a step you are changing the velocity of your body.• You are probably most familiar with the velocity changes of a moving bus or car.• The rate at which velocity (speed with direction) changes occur is called acceleration.
3. 3. Acceleration how quickly velocity changes over time. 0• Acceleration=• final velocity- starting velocity 3 Speed 1 time 2• Change in velocity = Meters/second• final – starting velocity velocity• Acceleration = change in velocity time
4. 4. Positiveacceleration Negative acceleration
5. 5. In Science, Acceleration refers toincreasing speed, decreasingspeed, or changing direction.Increasing Speed; An object’sspeed increases, the objectaccelerates.Ex. Bike accelerates when it coastsdown a hill.
6. 6. Decreasing Speed; It is called‘deceleration’ or negative acceleration.Ex. A car stops at a red light traffic.Changing Direction; Objects can beaccelerating when they travelling at aconstant speed.Ex. The seats on a Ferris wheel acceleratebecause they move in a circle.
7. 7. Which of these describes the object with the largest acceleration ? An object with a small change invelocity over a small change in time An object with a small change invelocity over a large change in time An object with a large change invelocity over a small change in time An object with a large change invelocity over a large change in time
8. 8. Scalara measurement that doesNOT contain direction.E.g sample: SpeedVectora measurement that contains direction.E.g sample: Velocity