Let's consider collisions in two dimension:
Press Start to begin the animation.
Two circular objects will move with pre-defined velocity (yellow
Click left mouse button to suspend the animation. Now, you can
Click near the tip of the velocity vector and drag the mouse button
Click the mouse button again to resume the animation.
left/right to change its value (the initial velocity
of that object).
Click near the circular boundary and drag the mouse button to change
Click near the center of the circle and drag the mouse to change its
When the two objects collide, the animation will be suspend.
Press the mouse button ( Do not release it)
Press Reset button to reset parameters to default values.
to see the velocity vectors just after the collision.
eta is the coefficient of restitution eat Vf/Vi
You can select different frame of reference
Vf=relative velocity just after collision
Vi=relative velocity just before collision
for elastic collision eta=1.
for perfectly inelastic collision eta=0.
to view the relative motion of all the objects.
lab is a laboratory inertial frame.
View collision in 1 dimension.
m1, m2 and CM are frame of reference with respect
left circular object m1, right circular object m2
and center of mass for m1 and m2.
Author：Fu-Kwun Hwang, Dept. of physics, National Taiwan Normal University