===== Friction Activity =====

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 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 ====

Here is some code you can use and modify to create objects like blocks and platforms.

<code>
#Create a box object
MyBox = box(pos=vector(0,0,0), length=1, height=1, width=1, color=color.red)
</code>

==== Motion ====

Here is some code you can repurpose to define vectors and variables.

<code>
#Define a velocity vector
v = vector(3,0,0)

#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 (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 v
    MyBox.pos = MyBox.pos + v*dt
    
    #Update the time to go on to the next time-step after the position update
    t = t + dt
</code>

==== Graphing ====

Here is some code you can use to graph physical quantities in real-time with the animation, such as position or kinetic energy.

<code>
#Create graph object for position
PositionGraph = gcurve(color=color.red)

#While loop to iterate over 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
    MyBox.pos = MyBox.pos + v*dt
    
    #Add a data point to our graph for with the position at time t
    PositionGraph.plot(t,MyBox.pos.x)
    
    #Update the time to go on to the next time-step after the position update
    t = t + dt
</code>