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the applet:

i wanted to be able to drag the circle (x,y) along the x direction only, just like the real life case of a man moving forward and back to observe the graph of s vs t, v vs t, a vs t.

so the rate of me dragging the circle, determines the graphs.

drag slowly constant speed, gives s = v*t graph and v = v graph and a = 0 graph

i can't find any example on the public internet. private one i see before but i cannot link to them.

let me continue to search!

wait i think i am having a eureka moment. i think i figure out already

i tried

evolution page only:

x1 = x;

t = t + dt;

x2 = x;

v = (x2 - x1)/dt;

custom function: drag() // this is to make on drag(), t to increase still. to create illusion of time still running because without this, the drag moment t is not changing.

x1 = x;

t = t + dt;

x2 = x;

v = (x2 - x1)/dt;

but i seems to get no value for v.

i can't seems to create the difference in the value of x to be assigned to x2 and x1 differently despite the the line of code

t = t+ dt;