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--- 2020:genesee_friction_activity_snippets [2020/02/12 07:19]
wellerd
+++ 2020:genesee_friction_activity_snippets [2020/02/12 13:49] (current)
wellerd
@@ Line 3: / Line 3: @@
 Here is a link to the google doc where you can find more details on the activity: [[https://docs.google.com/document/d/1yGWHwJ3tRL8yq5J3BD2bIPrBk04dghvQxNl029No9xY/edit?usp=sharing | GISD Workday Activity]]
-Below we have provided some snippets of code you can use by copying into your own glowscript window, modifying the code, and running the program. Any code with a # in front of it is simply a comment (or an editor's note) that defines what the line will make the computer do.
+Below we have provided some snippets of code you can use by copying into your own Glowscript program, modifying the code, and running the program. Any code with a # in front of it is simply a comment (i.e., an editor's note) that defines what the line will make the computer do. The first line of a Glowscript code must always be...
+<code>
+GlowScript 2.9 VPython
+</code>
 ==== Objects ====
@@ Line 10: / Line 14: @@
 <code>
-MyBox = box(pos=vector(0,0,0), length=1, height=1, width=1, color=color.red) #Create a box object
+#Create a box object
+MyBox = box(pos=vector(0,0,0), length=1, height=1, width=1, color=color.red)
 </code>
@@ Line 18: / Line 23: @@
 <code>
-v = vector(3,0,0) #Define a velocity vector
+#Define a velocity vector
+v = vector(3,0,0)
-t = 0 #Define the initial time
+#Define the time variables (initial time, time-step, final time)
-dt = 0.01 #Define the time-step
+t = 0
-tf = 2 #Define the final time
+dt = 0.01
+tf = 2
 </code>
@@ Line 28: / Line 35: @@
 <code>
-while t < tf: #While loop to iterate over time until we reach the final time
+#While loop to iterate over time until we reach the final time
+while t < tf:
-    rate(100) #Rate keeps animation slow enough to view
+    #Rate keeps animation slow enough to view
+    rate(100)
-    MyBox.pos = MyBox.pos + v*dt #Position update step to predict location of box after a time-step dt base on v
+    #Position update step to predict location of box after a time-step dt base on v
+    MyBox.pos = MyBox.pos + v*dt
-    t = t + dt #Update the time to go on to the next time-step after the position update
+    #Update the time to go on to the next time-step after the position update
+    t = t + dt
 </code>
-==== Acceleration ====
-Here is some code you can repurpose to add acceleration to your simulation. Ultimately, this could be used to make objects slow down using friction (after defining some other variables and calculations).
-<code>
-a = vector(1,0,0) #Define an acceleration vector
-while t < tf: #While loop to iterate over time
-    rate(100) #Keeps animation slow enough to view
-    v = v + a*dt #Velocity update step to predict velocity of box after a time-step dt
-    MyBox.pos = MyBox.pos + v*dt #Position update step to predict location of box after a time-step dt
-    t = t + dt #Update the time to go on to the next time-step after the position update
-</code>
 ==== Graphing ====
@@ Line 62: / Line 53: @@
 <code>
-PositionGraph = gcurve(color=color.red) #Create graph object for position
+#Create graph object for position
+PositionGraph = gcurve(color=color.red)
-while t < tf: #While loop to iterate over time
+#While loop to iterate over time
-    rate(100) #Keeps animation slow enough to view
+while t < tf:
+    #Rate keeps animation slow enough to view
+    rate(100)
-    MyBox.pos = MyBox.pos + v*dt #Position update step to predict location of box after a time-step dt
+    #Position update step to predict location of box after a time-step dt
+    MyBox.pos = MyBox.pos + v*dt
-    PositionGraph.plot(t,MyBox.pos.x) #Add a data point to our graph for with the position at time t
+    #Add a data point to our graph for with the position at time t
+    PositionGraph.plot(t,MyBox.pos.x)
-    t = t + dt #Update the time to go on to the next time-step after the position update
+    #Update the time to go on to the next time-step after the position update
+    t = t + dt
 </code>