Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be...
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Transcript of Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be...
![Page 1: Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second?](https://reader035.fdocuments.us/reader035/viewer/2022062806/5697bfbc1a28abf838ca19cd/html5/thumbnails/1.jpg)
Review
a v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
![Page 2: Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second?](https://reader035.fdocuments.us/reader035/viewer/2022062806/5697bfbc1a28abf838ca19cd/html5/thumbnails/2.jpg)
Review
a
v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=0
![Page 3: Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second?](https://reader035.fdocuments.us/reader035/viewer/2022062806/5697bfbc1a28abf838ca19cd/html5/thumbnails/3.jpg)
Review
av
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=1
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Review
a v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=2
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Review
a
v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=3
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Review
a
v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=4
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Review
a
v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=5
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Reviewa
v
Are you going up or down?
Are you speeding up or slowing down?
What will your velocity be in 1 second?
t=6
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Bungee Jumping
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Motion 1
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Motion 2
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Motion 3
slowing
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Motion 4
bottom
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Motion 5
speeding up
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Motion 6
Still rising
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Motion 7
top
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1
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Velocity Acceleration Velocity Acceleration
bottom
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Problem
A car has initial velocity +30 miles/hour. It accelerates at +2 miles/hour/s for 10 seconds. What is its final velocity?
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Equation #1: vf = vi + a t
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Problem:
A child slides down a constant slope on a toboggan. When the child passes her older brother, he estimates her speed at 2 m/s. When she passes her younger brother 10 seconds later, he estimates her speed at 10 m/s. Estimate how far apart her brothers are standing.
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Equation #2: vf = vi + a t d = 1/2 (vi + vf) t
Short Cuts!!
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Problem: A boat is cruising at 3 m/s. At time
t=0, the boat begins accelerating with a=1.6 m/s/s. How far will the boat have traveled 10 seconds later?
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Which equation to use? vf = vi + at d = 1/2 (vi + vf) t
Both !!
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Problem:
First: what is the boat’s velocity after 10 s?
What is the boat’s average velocity? How far did the boat travel?
A boat is cruising at 3 m/s. At time t=0, the boat begins accelerating with a=1.6 m/s/s. How far will the boat have traveled 10 seconds later?
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Now: vf = vi + at d = 1/2 (vi + vf) t d = vi t + 1/2 a t 2
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Problem:
What do we know? What don’t we know? What don’t we care about?
A boat is cruising at 3 m/s. At time t=0, the boat begins accelerating with a=1.6 m/s/s. How far will the boat have traveled 10 seconds later?
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Problem: A plane is cruising at 50 m/s. The
plane suddenly begins accelerating with a=4m/s/s until it reaches 90 m/s. How far does it travel in this time?
What do we know? What don’t we know? What don’t we care about?
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OR:
How long does it take for the plane to reach 90 m/s?
What is the average velocity? What distance is covered?
A plane is cruising at 50 m/s. The plane suddenly begins accelerating with a=4m/s/s until it reaches 90 m/s. How far does it travel in this time?
![Page 30: Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second?](https://reader035.fdocuments.us/reader035/viewer/2022062806/5697bfbc1a28abf838ca19cd/html5/thumbnails/30.jpg)
Problem: A skier, starting from rest,
accelerates down a slope at 1.6 m/s/s. How far has she gone at the end of 5.0 seconds?