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Speeding Up and Slowing Down Acceleration and Deceleration

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ACCELERATION –Change in VELOCITY occurring over TIME –Units: METERS PER SECOND 2 –VECTOR Positive Velocity Positive Acceleration Speeding up in + direction Negative Velocity Negative Acceleration Speeding up in - direction Positive Velocity Negative Acceleration Slowing down Eventually speeds up in – direction! Negative Velocity Positive Acceleration Slowing down Eventually speeds up in + direction!

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Equations Acceleration is the rate of change in velocity over time An objects velocity at any point in time can be found by considering: - its starting velocity - its acceleration - the amount of time over which it accelerates Subscript f = final Subscript i = initial

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Tips on Solving Problems In order to receive full credit on tests and quizzes, including the Regents Test, you have to include the following in your answer: 1.The equation you will use 2.The given values WITH UNITS 3.The correct answer WITH UNITS *99% of the time, if there is a number it HAS UNITS ** Units for a certain number have to appear at least ONCE in your solution

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2 Methods A car travels 100 meters in 20 seconds, calculate its velocity. Recommended Method Alternative Method

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Example Two cars start at the same point. Car A starts with a velocity of -5 meters per second while Car B starts with a velocity of +3 meters per second. At the end of 15 seconds, Car A has a velocity of +25 meters per second. –Calculate Car As acceleration

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Example Two cars start at the same point. Car A starts with a velocity of -5 meters per second while Car B starts with a velocity of +3 meters per second. At the end of 15 seconds, Car A has a velocity of +25 meters per second. –If Car B has the same acceleration, determine its speed at 15 seconds

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SUMMARY Acceleration –Definition? –Vector or Scalar? –Units? –Equations? Describe the 2 methods to solve problems

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