catalyst
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Catalyst. v f - v i. a. =. The equation for acceleration is 1. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration ? - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/1.jpg)
Catalyst
The equation for acceleration is
1. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?
2. If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s/s for 3 seconds, what will its final velocity be?
3. What three things can you do to accelerate?
vf - vita=
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Today’s Agenda
5 min•Catalyst
35 min•Motion Graphs and Review
5 min•Exit Slip
![Page 3: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/3.jpg)
Motion Graphs
There are THREE types: Position vs. Time
Gives your position over a period of time. Velocity vs. Time
Gives your speed (velocity) over a period of time. Acceleration vs. Time
Gives your acceleration over a period of time.
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Position vs. Time Graphs
We’ve seen these before!
Slope is velocity (or speed)
Straight lines mean constant velocity
![Page 5: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/5.jpg)
Position vs. Time Graphs
Curved lines mean acceleration Cannot find slope
of curved lines
![Page 6: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/6.jpg)
Position vs. Time Graphs
Horizontal (flat) lines mean no motion Constant position
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Position vs. Time Graph Demonstration
http://zonalandeducation.com/mstm/physics/mechanics/kinematics/xvaVsTime/xVsTime.html
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Velocity vs. Time Graphs
These are new!
Slope is acceleration
Straight lines mean constant acceleration
![Page 9: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/9.jpg)
Velocity vs. Time Graphs
Curved lines mean changing acceleration Cannot find slope
of curved lines
![Page 10: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/10.jpg)
Velocity vs. Time Graphs
Horizontal (flat) lines mean no acceleration or constant speed
![Page 11: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/11.jpg)
Velocity vs. Time Graph Demonstration
http://www.physicsclassroom.com/mmedia/kinema/fs.cfm
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Acceleration vs. Time Graphs
Flat lines mean constant acceleration
Everything else means nothing! (for our purposes)
The only other acceleration vs. time graph you will see is this:
Which means no acceleration
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Example: No Motion
Position vs. Time
Velocity vs. Time
Acceleration vs. Time
![Page 14: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/14.jpg)
Example: Constant Velocity
Position vs. Time
Velocity vs. Time
Acceleration vs. Time
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Example: Constant Acceleration = Object is Speeding Up
Position vs. Time
Velocity vs. Time
Acceleration vs. Time
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Guided Practice #1-2
Which of the objects on each graph at right is accelerating? How do you know?
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Guided Practice #3
At which point is velocity (speed) the greatest?
At which point is velocity (speed) the least?
At which points is acceleration occurring?
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Guided Practice #4
At which point is velocity the greatest?
At which point is velocity the least?
At which points is acceleration occurring?
Where is acceleration the least?
![Page 19: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/19.jpg)
Today’s Agenda
5 min•Catalyst
35 min•Motion Graphs and Review
5 min•Exit Slip
![Page 20: Catalyst](https://reader033.vdocuments.site/reader033/viewer/2022051317/568164e3550346895dd7476d/html5/thumbnails/20.jpg)
Exit Slip1. What would the velocity vs. time graph look like for a car going straight on a highway at constant speed?
a. A horizontal (flat) lineb. A straight line that is
increasingc. A straight line that is
decreasingd. A curved line that is
increasing
2. What does a straight line with a positive slope mean on a velocity vs. time graph?
a. Increasing velocityb. Constant accelerationc. Constant velocityd. Both A and B
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Exit Slip
3. True or false: Constant acceleration means that the object is speeding up.
5. For which graph does a horizontal (flat) line always mean that the object is motionless?
a. Position vs. timeb. Velocity vs. timec. Acceleration vs. timed. Both A and C