EScooter Kinematics Part 2  Moving with Acceleration
* Required
Watch the video, and answer the questions below.
Watch Aniq on scooter (slow) vs Jovan running: Acceleration from rest (0:11 to 1:39).
Jovan starts accelerating at the 16 second point onwards. On the distancetime graph, how would you describe the path of Jovan's red line?
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1 point
straight diagonal
curving upwards
curving downwards
After Aniq passes Jovan, at what second does Jovan's position match Aniq again?
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1 point
10 seconds
19 seconds
25 seconds
31 seconds
At which second is Jovan's speed the same as Aniq?
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1 point
10 seconds
19 seconds
25 seconds
31 seconds
Now, watch Aniq on scooter (fast) vs Jovan running: Acceleration from rest (1:40 to 2:57).
The gradient of the speedtime graph is the acceleration. You can also get the average acceleration from the formula a=(vu)/t.
Using the speedtime graph ONLY (middle graph), estimate the average acceleration of Jovan (blue line) from 1 s to 5 s.
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1 point
0.1 ms^2
0.2 ms^2
0.3 ms^2
0.4 ms^2
Using the speedtime graph ONLY (middle graph), estimate the average acceleration of Jovan (blue line) from 5 s to 10 s.
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1 point
0.02 ms^2
0.04 ms^2
0.06 ms^2
0.08 ms^2
The distance travelled is the area under the speedtime graph.
Using the speedtime graph ONLY, calculate the distance travelled by Aniq (red line) from t = 6 s to t = 10 s.
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1 point
0.8 m
1.2 m
1.6 m
3.0 m
Using the speedtime graph ONLY, calculate the distance travelled by Jovan (blue line) from t = 6 s to t = 10 s.
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1 point
1 m
2 m
3 m
4 m
Now, watch Aniq on scooter (uniform acceleration) vs Jovan running (nonuniform acceleration (2:59 onwards).
Referring to the accelerationtime graph, at what time does Jovan's acceleration (blue line) reach its maximum?
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1 point
4.5 s
7.5 s
10.5 s
13.5 s
Compare this timing with the speedtime graph for Jovan (blue line). What do you notice?
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1 point
At this time the gradient is the steepest.
I don't notice anything.
(Jovan's blue line graphs) From 0 to 8 seconds, Jovan's speed is increasing, and his acceleration is increasing as well. This means that Jovan is getting faster as time passes, and the rate at which he gets faster is also increasing as time passes. How would you describe this in summary?
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1 point
increasing acceleration
decreasing acceleration
increasing deceleration
decreasing deceleration
(Jovan's blue line graphs) From 8 to 20 seconds, Jovan's speed is increasing, but his acceleration is decreasing. This means that Jovan is still getting faster as time passes, but the rate at which he gets faster is reducing as time passes. How would you describe this in summary?
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1 point
increasing acceleration
decreasing acceleration
increasing deceleration
decreasing deceleration
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