[quote]

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?

[/quote]

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 http://www.phy.ntnu.edu.tw/ to exception site list

Download EJS jar file(1369.7kB):double click downloaded file to run it. (30 times by 26 users) , Download EJS source (27 times by 9 users) View EJS source