from visual import *

# no automatic scaling of window
scene.autoscale=0
scene.range=10.0

# use a standard Python 3D object to represent particle
ball=sphere(radius=0.5,pos=vector(8.0,0.0,0))
ball.vel=vector(0,0,0)
dt=0.01
t=0

# loop over time (for ever!)
while 1:
    rate(100)
    t=t+dt
    ball.pos=ball.pos+ball.vel*dt
    ball.vel=ball.vel-ball.pos*dt