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--- course_planning:computation:scratch_work [2016/03/12 22:44] – [Project 2: Part C] obsniukm
+++ course_planning:computation:scratch_work [2016/03/25 18:40] (current) – [Code] obsniukm
@@ Line 23: / Line 23: @@
 <WRAP download 60%> Code for Project 2: Part C\\ Keep them in the same directory.\\ {{:183_projects:hovercraft.py|Project 2 Code (hovercraft.py)}}\\ {{:183_projects:physutil.py|PhysUtil Module}}</WRAP>
+====== Code ======
+<code python>
+#Objects
+hovercraft = sphere(pos=vector(-200,400,0), radius=1)
+#Parameters and Initial Conditions
+g = vector(0,-9.81,0)
+hovercraftm = 1500
+hovercraftv = vector(53.64,0,0)
+hovercraftp = runawaycraftm*runawaycraftv
+#Time and time step
+t=0
+tf=10
+dt = 0.01
+#MotionMap/Graph
+hovercraftMotionMap = MotionMap(hovercraft, tf, 5)
+#Calculation Loop
+while hovercraft.pos.x < 0:
+    Fgrav = hovercraftm*g
+    Fground = -Fgrav
+    Fnet = Fgrav + Fground
+    hovercraftp = hovercraftp + Fnet*dt
+    hovercraft.pos = hovercraft.pos + (hovercraftp/hovercraftm)*dt
+    hovercraftMotionMap.update(t, hovercraftp/hovercraftm)
+    t = t + dt
+</code>
+<WRAP tip>
+== Tutor Questions ==
+  * **Question:**  What assumptions did you make about the motion of the hovercrafts?
+  * **Expected Answer:**  That the runaway craft has a constant velocity, and the rescue craft starts from rest with a constant acceleration.
+  * **Question:**  Are these velocities and accelerations calculated from the numbers given exact?
+  * **Expected Answer:**  No, these are only average numbers, not instantaneous.  In order to get more "exact" numbers, we would need more data.
+  * **Question:**  Is the predicted position of the rescue craft a good one?
+  * **Expected Answer:**  Not really, basing the trajectory off the first 20 seconds of data is probably not the best -- but it is all we have to work with.
+  * **Questions:**  Can you draw a plot of position vs. time for both crafts?  What are the important features of this graph?
+  * **Expected Answer:**  The point where the two curves cross is when we should jump.  One should be linear, the other quadratic.
+  * **Questions:**  Can you draw a plot of velocity vs. time for both crafts?  What are the important features of this graph?
+  * **Expected Answer:**  The acceleration is the slope of each curve (constant in both cases).
+</WRAP>