Average speed Speed is a scalar variable Unit length over time ms Instantaneous velocity Speed and direction of object at a particular instant in time Velocity is a vector ID: 626175
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Slide1
Velocity and AccelerationSlide2
Average speed
Speed is a
scalar variable Unit = length over time (m/s)Slide3
Instantaneous velocity
Speed and direction of object at a particular instant in time
Velocity is a vector variableSlide4
Average velocity
v
avg = ∆ d = displacement t time interval Slide5
Average velocity
Another formula for average velocity
Unit = length over time (m/s)Slide6
acceleration
Definition -
Rate at which velocity changesAcceleration is a vector Slide7
acceleration
aavg = ∆v/t ∆v: change in velocity ∆t: change in time
(time interval)∆v =
v
f
– v
i Slide8
SCALAR
(Magnitude)
DistanceSpeedVECTOR(Magnitude & direction)PositionDisplacement
VelocityAccelerationSlide9
Speed and Velocity
Video
https://www.youtube.com/watch?v=DRb5PSxJerM https://www.youtube.com/watch?v=-6lrr6-ADY0 Slide10
Tumble Buggies Minilab
Step 1:
Get a buggy, whiteboard, meter stick, and marker. Write down buggy color and letter on your white board.Step 2: Using your phone as a timer and a meter stick to measure distance, collect 7-10 distance vs. time data points (i.e. distance travelled in 1s, 2s, 3s, etc.), create a data
table, and graph distance vs. time by plotting the points on your white board.Step 3: Use the slope of your plotted line to determine the velocity of your buggy.Slide11
Tumble Buggies, cont
.
Step 4: Join another group that has a different color buggy.Scenario 1: Using the two graphs each group created, determine where and when the blue buggy will catch up to the red buggy if the red buggy starts 3m ahead of the blue one.Test your prediction.Slide12
Tumble Buggies, cont
.
Scenario 2: Using your graphs, determine where and when the two buggies will collide if they start 5 m apart facing each other.Scenario 3: Compare graphs as a class and determine which two buggies are the fastest. Which are the slowest?Scenario 4: Class pick!Slide13
v
avg
= d tvavg t = d t = d vavgSlide14
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