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Acceleration Ch. 10.2

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Objectives Describe the concept of acceleration as a change in velocity. Explain why circular motion is continuous acceleration even when the speed does not change. Calculate acceleration as the rate at which velocity changes. Graph acceleration on a velocity-time graph.

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**This Graph Shows Constant Velocity**

2. Constant Increasing No Velocity 1. 3. Answer Now 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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**This Graph Shows No Velocity**

1. Constant No Velocity Increasing 2. 3. Answer Now 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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**What is the distance a man can run in 1 hour if he runs at 7 mi/hr?**

7 km 7 m 7 mi Answer Now 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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**What is the Velocity of a Plane that Travels 500 mi in 1 hour**

500m/s 500 mi/hr 500 km/hr Answer Now 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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**Using the Conservation of Momentum if car has the momentum of 50 kg**

Using the Conservation of Momentum if car has the momentum of 50 kg*m/s and a man is in the moving car the man has? 50 m/s 50 kg 50 kg * m/s Answer Now 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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**final velocity – initial velocity**

Acceleration Acceleration = change in velocity divided by the time interval in which the change occurred. Acceleration = a = final velocity – initial velocity time vf – vi t

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Units Acceleration = Vf – V i t Units = m or m s s * s

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**Acceleration Acceleration = rate at which velocity changes over time**

Quick time movie acceleration Acceleration occurs when there's a change in Speed Direction Or both change

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**Uniform circular motion is constant acceleration.**

QT Centripetal Acceleration Video of bucket and water having centripetal acceleration

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**Acceleration Acceleration can be determined from a graph**

QT Graphical Representations of Accelerations

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**Acceleration can also be determined from a velocity-time graph**

A straight line with slope = constant acceleration Slope of the line = acceleration

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**Horizontal line = constant speed, no acceleration or deceleration.**

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**Examine the following graph.**

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**A negative slope indicates that an object is slowing down or decelerating.**

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**Calculating Acceleration**

Acceleration is the rate at which velocity changes. Acceleration Equation (for straight-line motion) QT Distinguishing B/W Velocity and Acceleration QT Average Acceleration SI Units = m/s2

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**The Top Thrill Dragster at Cedar Point goes from 0 m/s to 53**

The Top Thrill Dragster at Cedar Point goes from 0 m/s to 53.6 m/s (120 mph) in 4 seconds. What is its acceleration? Given: a = Vf = V i = t = Algebra: Substitution:

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**A car traveling home at a velocity of 15**

A car traveling home at a velocity of 15.6 m/s slams on its brakes and comes to a stop to avoid a dog. If it takes 5 seconds to stop, what is the cars acceleration? Given: a = Vf = V i = t = Algebra: Substitution:

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**In what direction is the car accelerating?**

How can you tell mathematically?

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**A Porsche Boxster has an acceleration of 4. 51 m/s2**

A Porsche Boxster has an acceleration of 4.51 m/s2. If the car starts from rest how much time would it take for the vehicle to reach a speed of 11.3 m/s? Given: a = Vf = V i = t = Algebra: Substitution:

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**A golf ball thrown from the top of the sears tower accelerates at 9**

A golf ball thrown from the top of the sears tower accelerates at 9.8 m/s2 toward the ground and lands on the pavement 9.2 seconds. If the ball’s final speed is 93.0 m/s what was the speed with which the ball was initial thrown? Algebra: Substitution: Given: a = Vf = V i = t =

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