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Acceleration

Acceleration. 2. Ch. 1 . &. . Review. Choose A = Speed B = Velocity Magnitude and direction Scalar Vector Magnitude only. What is a motion map?. A motion map represents the position, velocity, and acceleration of an object at various clock readings.

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Acceleration

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  1. Acceleration 2 Ch 1 & .

  2. Review Choose A = Speed B = Velocity • Magnitude and direction • Scalar • Vector • Magnitude only

  3. What is a motion map? • A motion map represents the position, velocity, and acceleration of an object at various clock readings. • Represents position and velocity only. • It’s like taking a snapshot photo of a moving object. • Each image reveals the position of the object at one-second intervals.

  4. Review

  5. Acceleration • How fast an object changesis its velocity. • Three ways for Acceleration to occur: 1. Object Speeds up , + acceleration) 2. Object Slows down, - acceleration) 3. Object Changes direction Is the slope of a velocity vs. time graph

  6. The unit for acceleration is calculated by dividing the unit for velocity (m/s) by the unit for time (s) You get m/s/s , we write m/s2 we say meters per second squared Vf - Vi time Calculating Acceleration

  7. Gravity Acceleration • A force that pulls us downwardtoward the center of the Earth. Falling objects accelerate DOWNWARD at the rate of gravity, or 9.8 m/s2.

  8. Acceleration in Graphs • In distance vs. time graphs, acceleration is displayed with a curve, because it is gradual. D D t t + or - acceleration + or –acceleration?

  9. Practice Problems A. If an object starts from rest and accelerates to 60 m/s in 10 seconds, what was the acceleration? B. What is the acceleration of a bus that increases its speed by 14m/s in 4 seconds?

  10. Practice Problems C. A biker starting from rest reaches a final speed of 3.0 m/s in 3 seconds. What is the acceleration of the biker? D. The fastest land mammal, the cheetah, can accelerate at a rate of 30 m/s/s. How fast will the cheetah be going after 2 seconds if the cheetah started from rest?

  11. Practice Problems E. A rocket ship is traveling at 18,000 m/s when it turns on its rocket thrusters. After 50 seconds the space ship has reached a speed of 28,000 m/s. What is the ship’s acceleration? F. A roller coaster has a velocity of 40 mi/hr at the bottom of the hill. It slows to a velocity of 12 mi/hr during the 7 seconds it takes to reach the top of the next hill. What is its acceleration?

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