Published: Sep 07, 2024
The Physics Behind Mid-Air Bicycle Tricks: Why Braking Causes Front Flips and Accelerating Causes Backflips
Updated Sunday, December 31, 2023 at 3:41 AM CDT
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Applying the Brakes in Mid-Air
When performing tricks on a bicycle, such as jumps or flips, it is crucial to understand the physics at play. One interesting phenomenon is that applying the brakes mid-air can cause the wheels to completely stop, leading to skidding upon landing and potentially causing the rider to go flying over the handlebars. This occurs due to the sudden change in momentum and the conservation of angular momentum.
In mid-air, conservation of angular momentum plays a significant role in determining the bike's rotation. Just like astronauts throwing a ball to drift in the opposite direction, applying the accelerator makes the engine and wheel spin faster, causing the frame to start spinning in the opposite direction. This is why when you brake in mid-air, the bike tends to rotate forward, resulting in a front flip.
Accelerating and Backflips
On the other hand, accelerating in mid-air can lead to backflips. Newton's third law of motion explains this phenomenon. When braking, the bike applies a force opposite to the wheel's spinning direction, causing the bike to spin in the same direction as the wheel. Conversely, when accelerating, the bike rotor spins forward, causing the bike to spin backward, resulting in a backflip.
This behavior is consistent with the principle of equal and opposite reaction. Any action in physics has an equal and opposite reaction. When the tire applies a rotational force to start spinning, it applies that force to the bike itself in mid-air. Increasing the tire's rotation from 2 spins per second to 4 spins per second requires the same amount of rotational energy as decreasing it to 0, but in the opposite direction. This causes the bike to rotate in the opposite direction when accelerating, leading to a backflip.
The Role of Forces
Understanding the forces at play is essential in comprehending mid-air bicycle tricks. On a bicycle, pushing the leg forward on the pedal exerts a force backward on the rider. Similarly, in a car, the wheels and the car body experience a force that pushes the car backward in mid-air, causing it to flip. These forces contribute to the rotational motion and determine the outcome of the trick.
When applying the accelerator, the back wheel wants to spin faster while the front wheel wants to stay in the same position. To achieve this, the distance between the two wheels shortens in the direction of motion, causing the front wheel to pop up and bringing the wheels closer together. This change in distance and the resulting shift in weight distribution contribute to the rotational motion and the possibility of performing backflips.
understanding the physics behind mid-air bicycle tricks is essential for riders who want to perform impressive stunts. The conservation of angular momentum, Newton's third law of motion, and the role of forces all play a crucial role in determining whether braking will result in a front flip or accelerating will lead to a backflip. By grasping these concepts, riders can better control their movements and execute tricks with precision and style.
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