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**ACCELERATION Motion is change of position**

Motion is described by velocity: How fast? Which way? Changing motion means: Speeding up, Slowing down, Changing direction (turning)

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ACCELERATION A car is accelerating whenever there is a change in velocity Acceleration also applies to changes in direction. It is important to distinguish between speed and velocity. Acceleration is defined as the rate of change in velocity, rather than speed

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**ACCELERATION Acceleration is the rate at which velocity changes:**

Acceleration is how fast how fast changes or how fast the direction changes

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**Falling upward: constant acceleration**

Now consider a ball thrown straight up at 30 m/s: What happens on the way up? How fast is the ball moving 1 s, 2 s, 3 s later? Where is the ball when v = 0? How long does the ball take to reach the highest point? How fast is the ball moving 4 s later? How long does the ball take to reach the person? How fast is the ball moving when it reaches the person?

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**Ball Toss Experiment Ball is in your hands Ball is in your hands**

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**Ball Toss Experiment Ball is in the air Ball is in the air**

Ball is in your hands Ball is in the air Ball is in your hands

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**Motion with Constant Acceleration**

- 4.8 X 2 = 9.6 equal equal

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**Motion with Constant Acceleration**

General equations: y = ½ at2 + vot v = at + vo a is constant ( a number)

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**Free Fall: Constant Acceleration**

The acceleration of an object in free fall is about 10 meters per second every second Or 10 m/s/s The rock is falling faster and faster: Each second its velocity increases by 10 m/s Fill out the table: Time, seconds Velocity, m/s 1 2 3 4 t Time, seconds Velocity, m/s 1 10 2 20 3 30 4 40 t 10t Graph these values: make a velocity-time graph

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**Motion with Constant Acceleration**

Velocity-Time Graph On a velocity-versus-time graph, acceleration = slope

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**Free Fall: Constant Acceleration**

The acceleration of an object in free fall is about 10 meters per second every second Or 10 m/s/s The rock is falling faster and faster: Each second its velocity increases by 10 m/s Time, seconds Velocity, m/s 1 10 2 20 3 30 4 40 t 10t

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**Motion with Constant Acceleration**

Position-Time Graph y = ½ at2

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**Position, Velocity, and Acceleration**

Motion Graphs Constant Acceleration Graphs Race Cars

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