Acceleration!. Chapter 9 Section 3. Acceleration. Let’s Review: What is Speed? Velocity? What is a Vector? Acceleration : RATE at which velocity changes Refers to INCREASING speed, DECREASING speed, or CHANGING direction . Is Acceleration a Vector?
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Chapter 9 Section 3
Let’s Review: What is Speed? Velocity? What is a Vector?
A softball accelerates when it is thrown, hit, or caught. What change in motion occurs in each example?
Thrown- ball accelerates as it is thrown
Hit- ball changes direction
Caught- ball decelerates (negative acceleration)
How can a car be accelerating if its speed is constant at 65 km/h?
The arrows are larger as the plane increases speed or accelerates…the arrows represent the vector quantity.
Acceleration is like…Because…
Now, let’s play Gotcha!
Final Velocity-Beginning Velocity
As a roller coaster starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22 m/s in the same direction. What is its acceleration?
Initial Velocity: 4 m/s
Final Velocity: 22 m/s
Time: 3 s
Final Velocity – Initial Velocity/ Time
22 m/s – 4 m/s
18 m/s = 6 m/s/s or 6 m/s2
Line is straight means acceleration is constant