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Physics of Motocross

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Nolan Peters

on 6 January 2013

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Transcript of Physics of Motocross

THE PHYSICS OF MOTOCROSS By: Nolan Peters Intro In this presentation I will explain how a rider can use physics to his or her advantage or disadvantage as the rider preparers for, and takes, a big jump. Preparing for the Jump After the rider has gotten through the start and over the first couple of jumps comes the rhythm section. This is where the jumps line up so one could have a good rhythm. How do the riders prepare for this? And how do physics affect them? Let's find out... The Turn... When going into a turn the rider needs to decelerate so he does not go over the berm. However, in going into a right turn the rider needs to use the front brake because he needs to put his right foot down. Here's what can happen. If you look closely, you will notice that when the rider breaks, he gets pulled forward and the front suspension will suppress. Why? Inertia... Inertia Affects This happens to the rider because the rider has inertia. Due to the fact the rider and the bike were moving at the same rate, when the bike's front wheel stops, the rider's body and the back of the bike want to continue to move at that constant motion. Heading for the Berm What's great about the berm is it allows the rider to ride up and can maintain a greater speed than a flat turn. But what allows the rider to be almost parallel to the ground when turning? Turning the Berm When up on a berm the rider uses centripetal force to ride along the outside with greater speed and come out of the turn with a high velocity. As opposed to riding the inside line. Watch as Davi Milsaps uses the berms to his advantage. Coming Out of the Berm When coming out of the berm, the rider will let go of the clutch and fly out. The bikes speed will increase and the riders inertia will want him to stay at the constant speed. As a result, the rider will be pulled back from the bike. This creates a physical barrier that can tire riders out. Centripental force is "a force which keeps a body moving with a uniform speed along a circular path." The Jump After making it around the turn the rider now faces a jump. Somethings to consider are air time velocity and trajectory, but what I found interesting is how riders use friction to jump. This rider slides his back tire, creating friction to reduce his air time, to stay fast but stay low to the ground, therefor allowing a faster jump. Much faster than the other rider which created the pass. This is called the "bubba scrub" The Jump Something else I found interesting about jumping is that the rider can use the bike inertia while in the air to adjust his position. Watch closely as the rider taps the rear break to lower the nose. This happens because the inertia of the tire wants to continue to move forward but can not. There for moving the bike forward instead. Big Idea systems affect systems
that can create negative
or positive changes One example of how systems affect systems is how the system of friction, and how the rider uses it, affects the system of time. When a rider uses the "bubba scrub" it allows him to reach his target faster because he spends less time in the air, hence creating a faster lap time. This creates a positive change. Another example of systems affects systems is when the system of inertia affects the systems of the rider. For example, when the rider is in the air he can use the inertia of the bike to affect his position, to create a safe, effective landing. My last example of how systems affects systems is how inertia affects a skater. When a skater is riding and the wheel hits a small rock, the board stops, but the rider wants to continue moving forward. The rider will then often fall off the board. This creates a negative change. Conclusion In conclusion, I've learned a lot about how a rider is affected by physics, but also how they might use science to help them succeed. And I think it's kinda cool to now be able to say when riding with my brothers or watching the pros, "So that's why it works!" Bibliography "The Science of Corners." www.infographichub.com/science/physics-motocross-racing/ 11/20/12
"Physics of Motocross" www.youtube.com/watch?v=nbPvj2ELXIA
"Moto-Science" www.youtube.com/watch?v=mjG03YD75NQ&feature=related 11/21/12
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