This is an email message from Michael:
Dear Fu-Kwun,

I have a new simulation idea – skiing over a bump.

Pedagogical targets

a)      To show the variation of the normal force as the skier goes over a bump (undulation)
b)      To show that the skier at a certain speed becomes airborne (loss of snow contact)
c)       To show the difference between skiing with stiff and springy legs, i.e. a certain amount of suspension.

Initial variables to play with

1)      Initial speed (0 to 100 km/h)
2)      The height of the bump (10 to 100 cm)
3)      Skierīs weight (20-100 kg)
4)      Stiff/springy legs (yes or no)

The bump could comprise a segment of a circle or an ellipse to facilitate the computation. Perhaps a single step option would make it easier to follow the variation of the normal force?

Is this something that could be accomplished?

The following is my first version of simulation for skiing over a bump.
[s]I still need to find a way to show the difference between skiing with stiff and springy legs.[/s]
The difference between skiing with stiff and springy legs has been implemented: change the k with the slider.
Stiff legs is corresponds to larger k.  The stiffness of the leg is simulated with a spring (spring constant k).

Vx_zero is the velocity when skier move to staring point of the arc (i.e. x=0 in the simulation coordinate)
You can drag skier when the simulation is "paused".

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/skijump3_pkg/skijump3.propertiesFull screen applet or Problem viewing java?Add to exception site list
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