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--- 2020:genesee_friction_activity_snippets [2020/02/12 06:46]
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 line of 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...
-==== Creating a box ====
+<code>
+GlowScript 2.9 VPython
+</code>
+==== Objects ====
 Here is some code you can use and modify to create objects like blocks and platforms.
@@ Line 22: / Line 26: @@
 v = vector(3,0,0)
-#Define the time variables (initial time, time-step, final time) for the while loop
+#Define the time variables (initial time, time-step, final time)
 t = 0
 dt = 0.01
 tf = 2
 </code>
-Here is some code you can repurpose to add animations to your code.
+Here is some code you can repurpose to add animations to your code (notice the indentation of lines below the while line).
 <code>
 #While loop to iterate over time until we reach the final time
 while t < tf:
     #Rate keeps animation slow enough to view
     rate(100)
-    #Position update step to predict location of box after a time-step dt base on MyBox.velocity
+    #Position update step to predict location of box after a time-step dt base on v
     MyBox.pos = MyBox.pos + v*dt
@@ Line 42: / Line 47: @@
     t = t + dt
 </code>
-==== Physics ====
-Here is some code you can repurpose to make objects slow down using friction (after defining some variables and calculations).
-<code>
-#While loop to iterate over time
-while t < tf:
-    rate(100) #Keeps animation slow enough to view
-    #Velocity update step to predict velocity of box after a time-step dt
-    MyBox.velocity = MyBox.velocity + a*dt
-    #Position update step to predict location of box after a time-step dt
-    MyBox.pos = MyBox.pos + MyBox.velocity*dt
-    t = t + dt #Update the time to go on to the next time-step after the position update
-</code>
 ==== Graphing ====
-Here is some code you can use to graph physical quantities in real-time with the animation, such as kinetic energy.
+Here is some code you can use to graph physical quantities in real-time with the animation, such as position or kinetic energy.
 <code>
-GlowScript 2.9 VPython
+#Create graph object for position
-#This snippet of code will plot kinetic energy in a while loop
+PositionGraph = gcurve(color=color.red)
-#Assign MyBox a velocity, acceleration, and mass
-Velocity = vector(5,0,0)
-Acceleration = vector(0.5,0,0)
-Mass = 50
-#Set up the time variables for the while loop
-t = 0
-dt = 0.01
-tf = 2
-#Create graph object
-Kgraph = gcurve(color=color.red)
 #While loop to iterate over time
 while t < tf:
-    rate(100) #Keeps animation slow enough to view
+    #Rate keeps animation slow enough to view
+    rate(100)
     #Position update step to predict location of box after a time-step dt
-    Velocity = Velocity + Acceleration*dt
+    MyBox.pos = MyBox.pos + v*dt
-    #Calculate kinetic energy at this time
+    #Add a data point to our graph for with the position at time t
-    K = 0.5*Mass*mag(Velocity)**2
+    PositionGraph.plot(t,MyBox.pos.x)
-    #Add a data point to our graph for the kinetic energy at time t
+    #Update the time to go on to the next time-step after the position update
-    Kgraph.plot(t,K)
+    t = t + dt
-    t = t + dt #Update the time to go on to the next time-step after the position update
 </code>