Understanding the Forces:
* Friction: This opposes the cyclist's motion, acting against the wheels and the air resistance.
* Upthrust (Buoyancy): This is the upward force exerted by the air on the cyclist and bike. Since the density of air is low, this force is usually negligible.
* Thrust: This is the force propelling the cyclist forward. In this case, it's the force generated by the cyclist's pedaling.
Terminal Velocity:
Terminal velocity is reached when the net force on the cyclist is zero. This means:
* Friction (including air resistance) + Upthrust = Thrust
Key Points:
* Thrust isn't equal to friction and upthrust individually. Instead, it's equal to the sum of these forces when the cyclist is at terminal velocity.
* Upthrust is usually minimal and can be ignored for practical purposes.
* The term "thrust" is generally used for propulsion, not opposing forces.
In Summary:
At terminal velocity, the cyclist's forward thrust exactly balances the opposing forces of friction (including air resistance) and any minimal upthrust.
