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
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=
Today’s Agenda
5 min•Catalyst
35 min•Motion Graphs and Review
5 min•Exit Slip
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.
Position vs. Time Graphs
We’ve seen these before!
Slope is velocity (or speed)
Straight lines mean constant velocity
Position vs. Time Graphs
Curved lines mean acceleration Cannot find slope
of curved lines
Position vs. Time Graphs
Horizontal (flat) lines mean no motion Constant position
Position vs. Time Graph Demonstration
http://zonalandeducation.com/mstm/physics/mechanics/kinematics/xvaVsTime/xVsTime.html
Velocity vs. Time Graphs
These are new!
Slope is acceleration
Straight lines mean constant acceleration
Velocity vs. Time Graphs
Curved lines mean changing acceleration Cannot find slope
of curved lines
Velocity vs. Time Graphs
Horizontal (flat) lines mean no acceleration or constant speed
Velocity vs. Time Graph Demonstration
http://www.physicsclassroom.com/mmedia/kinema/fs.cfm
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
Example: No Motion
Position vs. Time
Velocity vs. Time
Acceleration vs. Time
Example: Constant Velocity
Position vs. Time
Velocity vs. Time
Acceleration vs. Time
Example: Constant Acceleration = Object is Speeding Up
Position vs. Time
Velocity vs. Time
Acceleration vs. Time
Guided Practice #1-2
Which of the objects on each graph at right is accelerating? How do you know?
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?
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?
Today’s Agenda
5 min•Catalyst
35 min•Motion Graphs and Review
5 min•Exit Slip
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
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