Each bobsled track in the world is made up of anywhere between 14 and 20 curves. Each one of these curves is different. Looking at a track like a typical road map, you may notice that each curve has a specific radius as well as length. But in addition to this, you must remember that the track is also descending down a mountain, so each curve also has a drop in elevation. Therefore geometry and even trigonometry play a part in determining the fastest route through the curves. (Keep in mind that the shortest route is not always the fastest route in bobsled. Even though the shortest line through a curve is a low line, often times it is necessary to gain height in a curve in order to use gravity to accelerate out of the curve.)
{The American team pushes and loads into the sled during practice in Park City, UT.}
{Centripetal force pushes the crew of the “Night Train” high on a curve as they travel over 90 mph.}
Perhaps the most common science used in bobsledding is physics. Mass is one variable that can be adjusted to affect a few different things. As a bobsled is travelling down a track, more mass equals more acceleration. There is, of course, a weight limit for the sled (with athletes) traveling down the track regulated by the FIBT (630 kg). But a heavy sled is more difficult to push fast at the start. So a team would prefer to push a light empty sled (also limited to a minimum of 210 kg in 4-man). Therefore a team must find a balance of a light empty sled to push and a heavy sled in which to ride down the track. Physics also plays a part in determining the energy a sled has as it exits a curve and accelerates to the next curve. Centripetal force can exert up to 5 G’s of force (five times that of gravity) on a sled as it passes through tight curves at high speeds.
Just like chemistry and biology play a vital role in producing maximum corn yields, bobsledders must also rely on science to succeed. Going to high school in central Nebraska, I certainly wouldn’t have thought I would need to use Mr. Lyon’s physics lessons on friction to help me strive for the Olympics!
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