![Page 1: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/1.jpg)
Acceleration Notes • Acceleration describes how quickly the velocity changes. • Deceleration or a negative acceleration means slowing down.
![Page 2: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/2.jpg)
UNITS FOR ACCELERATION
• If a car can increase its velocity from 0 m/s to 20 m/s in 1 second then it's acceleration is 20m/s/s. If a car can increase its velocity from 0 m/s to 20 m/s in 1 minute then its acceleration is 20 m/s/min
• An acceleration in 20 m/s/s is often written as 20 m/s2. This means that each second that passes, the car’s velocity increases by 20 meters per second.
![Page 3: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/3.jpg)
If your speed increases by 1 m/s each second, then your acceleration is 1 m/s².
![Page 4: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/4.jpg)
ACCELERATIONFORMULA
![Page 5: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/5.jpg)
Practice with the formula…. As a rollercoaster starts down a hill, its velocity is 4
m/s, but 3 seconds later, at the bottom of the hill, its velocity is 22 m/s. What is its acceleration? a= 22m/s – 4 m/s = 6 m/s/s or 6 m/s2 3 s
Every second that passes, the rollercoaster speeds up by 6 meters per second!
![Page 6: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/6.jpg)
A lizard slows down from 20 mi/hr to 5 mi/hr in 4 seconds. What is the lizard’s acceleration?
a = 5 mi/hr – 20 mi/hr = - 3.75 mi/hr/s
4 s Every second that passes the lizard slows
down by 3.75 miles per hour!
![Page 7: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/7.jpg)
Asailboatincreasesitsvelocityfrom1m/sto4m/sin3seconds.Whatwillthevelocityofthesailboatbeat6secondsiftheacceleraGonstaysthesame?
![Page 8: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/8.jpg)
Acceleration = (4-1) = 1 m/s2 3
3 sec = 4 m/s 4 sec = 5 m/s 5 sec = 6 m/s
6 sec = 7m/s final velocity!
![Page 9: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/9.jpg)
Acceleration and motion graphs • The slope of a velocity (or speed) vs. time graph is the object’s acceleration. If the line on the graph is horizontal, then the car is moving at a constant speed and therefore it doesn’t have any acceleration! Thereisnochangeinspeedsothere
isnoacceleraGon.
![Page 10: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/10.jpg)
TRY: • Draw a velocity vs. time graph for the following
situations: 1. Constant Acceleration 2. Constant Deceleration 3. No acceleration
Time
Velocity
![Page 11: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/11.jpg)
Constant Acceleration
Time
Velocity
![Page 12: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/12.jpg)
Constant Deceleration
Time
Velocity
![Page 13: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/13.jpg)
No acceleration
Time
If the speed is not changing, there is no acceleration!!
Velocity
![Page 14: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/14.jpg)
Free fall • An object is in free fall if it is accelerating due to the force of gravity ONLY. Objects in free fall on Earth accelerate downward at afree fall = 9.8 m/s2.
![Page 15: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/15.jpg)
Aballisinfreefall(onEarth)aMerbeingdroppedfromrest.Willthespeedoftheballbegreaterthan30m/saMerfallingforonly2seconds?Proveyouranswerusingmath.
![Page 16: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/16.jpg)
A ball in free fall will NOT be going greater than 30 m/s after 2 seconds. It will only have a speed of 19.6 m/s (9.8+9.8). Starting from rest means at 0 seconds = 0 m/s after 1 second = 9.8 m/s after 2 seconds = 19.6 m/s (9.8+9.8)
![Page 17: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/17.jpg)
Acceleration is a vector! (vector = direction matters!)
• This means that acceleration occurs whenever there is a change in speed, direction, or both.
![Page 18: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/18.jpg)
![Page 19: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/19.jpg)
PLICKER QUESTIONS
![Page 20: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/20.jpg)
Section Review 3.3 (p.73) 1. The seconds are squared in m/s2 because one unit of time is part of the speed unit and the other is the time over which the speed changed. It is easier than saying m/s/s or meters per second per second.
![Page 21: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/21.jpg)
Section Review 3.3 (p.73) 2. A negative acceleration means you are slowing down over time.
![Page 22: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/22.jpg)
3. Acceleration = 6m/s-0m/s = 2 m/s2
3 sec
Section Review 3.3 (p.73)
![Page 23: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/23.jpg)
Section Review 3.3 (p.73)
4.a.5m/s-3m/s=2m/sisthechangeinspeed.b.2m/sdividedby4s=0.5m/s2
![Page 24: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/24.jpg)
Section Review 3.3 (p.73) 5. Yes, a car accelerates when it turns a corner at a constant speed because acceleration is a vector so direction matters.
![Page 25: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/25.jpg)
Section Review 3.3 (p.73) 7. C. The speed is greater than zero but the horizontal line tells us the speed stays the same over time.
![Page 26: Acceleration notes - greenetappan.weebly.comgreenetappan.weebly.com/.../5/8/1/2/58124231/acceleration_notes.pdf · Acceleration Notes •Acceleration describes how quickly the velocity](https://reader031.vdocuments.mx/reader031/viewer/2022020204/5aa92d897f8b9a95188c7258/html5/thumbnails/26.jpg)
Section Review 3.3 (p.73)
8. A object that is dropped in free fall increases its speed by 9.8 m/s every second.