NetLogo User Community Models
by Sifat Momen (Submitted: 02/26/2007)
WHAT IS IT?
This is a simulation that illustrates inelastic collision between two trolleys (in this case two model cars A and B) moving over a low-friction surface [Friction is too small and therefore can be neglected]. This is a classic simulation that shows that the total momentum is conserved i.e. total momentum before collision = total momentum after collision.
The simulation can be used to alter the Mass and the Speed of the trolleys and also the direction of motion of trolley B. Direction of motion of trolley A before collision is fixed and is to the right.
HOW IT WORKS
Each trolly has a mass and a speed. The mass and the speed of the two trolleys can be set using the sliders. Trolley A always moves to the right whereas trolley B can move to the right or to the left as set by the user. After the two trolleys collide, they stick together and move as one (i.e. coalesce) but the total momentum before collision and the total momentum after collision always remains the same.
HOW TO USE IT
The Mass and the Speed of the trollys can be set using the following sliders:
Mass_A: Mass of A
The direction of the trolleys can be adjusted using the switch facing_each_other?
Trolley A always moves to the right.
The monitors used in the simulator are as follows:
common-velocity: Shows the velocity of the two trolleys after collision. It is common
|Momentum of A before collision|: Magintude of the momentum of A before collision
THINGS TO NOTICE
See what happens if they have the same magnitude of the momentum before collision. For instance if Mass_A = 3 Kg, Speed_A = 5 m/s, Mass_B = 5 Kg and Speed_B = 3 m/s.
THINGS TO TRY
Try out all possible options:
EXTENDING THE MODEL
Since it is an inelastic collision, total kinetic energy is not conserved rather upon collision some energy will be lost as thermal energy and sound energy. These effects might be included in the extension of the model.
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