Physics of Motorsports: Seat Bounce Debate

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In summary, there has been an ongoing debate on motocross message boards about the physics behind a "seat bounce." This debate has led to the creation of a discussion board specifically for this topic. Some believe that the bounce is caused by the rebound of springs, others argue that it is due to a lower center of gravity, and some suggest that it is caused by "springs" in the rider's arms and legs. The latest thread on this topic has been opened in hopes of finding a physics expert to provide a definitive answer. The debate has been sparked by the fact that a seat bounce allows riders to achieve greater distance and height than just hitting the jump standing. Images of the seat bounce in action have also been provided for reference.
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ProMed
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Hello,

There has been an ongoing debate on several motocross message boards over the last few months regarding the physics behind a "seat bounce" (pictured below). It has even lead to the creation of a discussion board in the last two weeks called www.seatbounce.com.

I am not here to spam this board since I have no affiliation other than I am looking for Physics experts to help solve this problem. Performing a seat bounce allows a rider to fly both farther and higher than just hitting the jump/ramp while standing. Some guys are saying it is caused by the springs rebounding propelling the rider other says it is from the COG being lower allowing more traction, and others are saying it is from "springs" in the riders arms/legs.

http://www.seatbounce.com/forum/viewtopic.php?t=19

The thread above is the most recent debate opened up and hopefully one of you experts could help end this once and for all!

Thank you!
Paul

http://www.transworldmotocross.com/mx/content/images/nov04/111604KG9V3119sm.jpg http://www.transworldmotocross.com/mx/content/images/nov04/111604KG9V3120sm.jpg http://www.transworldmotocross.com/mx/content/images/nov04/111604KG9V3121sm.jpg
http://www.transworldmotocross.com/mx/content/images/nov04/111604KG9V3122sm.jpg http://www.transworldmotocross.com/mx/content/images/nov04/111604KG9V3123sm.jpg http://www.transworldmotocross.com/mx/content/images/nov04/111604KG9V3124sm.jpg
 
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Could anyone help out with this?
 
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Hello Paul,

Thank you for bringing this interesting debate to my attention. I am always excited to see discussions about the application of physics in real-world scenarios.

After reviewing the images and reading the various arguments, I believe that the most likely explanation for the seat bounce phenomenon is a combination of factors. Firstly, the rebound of the suspension springs does play a role in propelling the rider further and higher. This is due to the conservation of energy principle, where the potential energy stored in the compressed springs is converted into kinetic energy as the springs rebound.

Secondly, the lower center of gravity (COG) of the rider also contributes to the increased traction and stability during the seat bounce. This is because a lower COG allows for better weight distribution and balance, resulting in more control over the bike and ultimately, a higher jump.

Lastly, the "springs" in the rider's arms and legs also play a role in the seat bounce. This is due to the fact that the rider's body acts as a shock absorber, absorbing the impact of the jump and transferring that energy back into the bike, creating a rebound effect.

In conclusion, the seat bounce is a result of multiple factors working together, including the rebound of suspension springs, a lower COG, and the rider's body acting as a shock absorber. I hope this helps to end the debate and provide a better understanding of the physics behind this exciting aspect of motorsports.

Best regards,
 

FAQ: Physics of Motorsports: Seat Bounce Debate

What is the "seat bounce" technique in motorsports?

The "seat bounce" technique in motorsports is a technique used by riders to gain extra height when jumping over obstacles on a motocross track. It involves the rider shifting their weight backwards and then quickly forward as they approach the jump, causing the suspension to compress and then rapidly extend as they launch off the jump.

Is the seat bounce technique more efficient than other techniques for jumping?

There is much debate among riders and experts about the efficiency of the seat bounce technique compared to other jumping techniques in motorsports. Some argue that it allows for greater height and distance, while others believe it may cause excessive strain on the bike's suspension and lead to less control over the jump. Ultimately, the effectiveness of the technique may vary depending on the rider's skill and the specific track and obstacles.

How does the seat bounce technique affect the physics of the bike and rider?

The seat bounce technique can significantly impact the physics of the bike and rider during a jump. When the rider shifts their weight backwards, the suspension compresses, storing potential energy. As the weight is then shifted forward, this energy is released and converted into kinetic energy, propelling the bike and rider upwards. This technique also affects the center of mass and balance of the bike, requiring precise control from the rider to maintain stability.

Are there any potential risks or drawbacks to using the seat bounce technique?

As with any technique in motorsports, there are potential risks and drawbacks to using the seat bounce technique. The rapid compression and extension of the suspension can cause strain and potential damage to the bike's components, such as the shock absorbers. Additionally, if not performed correctly, the technique can lead to loss of control and potentially cause accidents. Proper training and practice are crucial for safely and effectively utilizing the seat bounce technique.

How do physics principles play a role in the seat bounce debate in motorsports?

The seat bounce debate in motorsports is largely centered around the application of physics principles and how they affect the effectiveness and safety of the technique. These principles include energy conservation, center of mass, and balance, among others. Understanding these principles and how they interact with the bike and rider is essential for successfully navigating jumps and performing the seat bounce technique.

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