Presentation Transcript
Slide1: Winter Alpine Physics Alexey Abrikosov, jr.
Institute of Theoretical and Experimental Physics, Moscow, Russia
Andrei Varlamov
COHERENTIA, CNR-INFM, Rome, Italy
Speed scales: 0 50 100 150 200 250 km/h Speed scales
Speed skiing: Monte Rosa glacier under Matterhorn;
Maximum gradient — 62° Speed skiing
Speed skiing tracks: Speed skiing tracks
Free Fall: Free fall from 1000 m Free Fall
Wind tunnel: Wind tunnel
Physical factors in speed skiing: Gravity and angle
Air drag
Friction Physical factors in speed skiing
Bobsleigh & Luge: The sport of bobsleigh began at the end of 19th century when the Swiss attached a steering mechanism to a toboggan.
In 1897, the world's first bobsleigh club was founded in St. Moritz, Switzerland. Eugenio Monti (Italy) won
11 world championships
(1957–1968 ); Bobsleigh & Luge
Track and speed: Track and speed
Addends of victory : Addends of victory Push Ride Win!
Centripetal versus centrifugal: Centripetal versus centrifugal
Physical factors in bobsleigh: Initial impulse
Gravity
Air drag
Friction
Optimal trajectory Physical factors in bobsleigh
Slide14: Luge speed record
139.4 km/h
Tony Benshoof
The problem of optimal trajectory: The problem of optimal trajectory What is the fastest way from A to B?
Is the straight way faster?
Brachistochrone: Brachistochrone What is the path of quickest descent from A to B? The minimal time problem
Other minimum principles: Other minimum principles Brachistochrone — minimal time problem
Cycloid: Cycloid Johann Bernoulli, 1697
Alpine Skiing: Alpine Skiing
Special Slalom: Special Slalom
History of skiing: History of skiing Cave drawing from Eastern Russia. (between 7000 and 5000 B.C.)
Telemark skis.: Telemark skis. New skis were shorter (about 2 m 40 cm) than other skis used at that time. Sondre Norheim (Telemark County, Norway, XIX century)
Fridtjof Nansen: Fridtjof Nansen Norwegian arctic explorer, zoologist and statesman; Nobel Peace Prize 1922. 12 times national champion in skiing;
World record for one-mile skating. 1890 — book
On Skis Over Greenland The first to cross the mid-Greenland ice cap on skis (1888).
Nansen Gallery: Nansen Gallery
Telemark turn: Telemark turn
Basics of alpine skiing: Basics of alpine skiing
Ski robots: Ski robots
Skidding: Skidding Work against friction A is proportional to swept area S
Carving revolution of 1990-ies: Carving revolution of 1990-ies
Optimal trajectory: Optimal trajectory
With and without friction: With and without friction
Swing and parametric resonace: Swing and parametric resonace
Carving and acceleration: Carving and acceleration
Center of mass in motion : Center of mass in motion
Cross-country versus Alpine: Cross-country versus Alpine Cross country Alpine
Acceleration: Acceleration
What it looks like: What it looks like Ivica Kostelic, World Champion in slalom, 2003
Altitude loss and speed gain: Altitude loss and speed gain
Speed control : Speed control Passive — skidding and carving;
Active — flexion–extension.
Energy pumping: Energy pumping –
Physical factors in alpine skiing: Physical factors in alpine skiing Gravity
Air drag (downhill, GS, SuperG)
Friction (skidding and carving)
Optimal trajectory (slalom)
Flexion-extension (slalom, GS)
Gallery of Alpine Glory - I: Gallery of Alpine Glory - I
Gallery of Alpine Glory - II: Gallery of Alpine Glory - II
Gallery of Alpine Glory - III: Gallery of Alpine Glory - III
Acknowledgements: Acknowledgements Yuriy Preobrajenskiy
Slide46: Skiing is not the bliss but a perfect substitute