New answers tagged physics
In almost every slope you will hit a speed "sweet spot" where the gravity pull and drag from the wind will cancel each other out, this can be at 70 km/h for a 8% slope in aero position or 15 km/h for a 2% slope on an hybrid bike.
You are going at constant speed when the driving force from gravity Fg is equal to the drag (air resistance) Fd plus friction (rolling resistance) Ff: Fg = Fd + Ff When coasting down a hill, the driving force is the component of the gravitational force parallel to the road: Fg = m g sin(a) Here, a is the slope (angle with the horizontal), m is the mass ...
Newtons second Law: F=ma where m is your mass (including everything, bicycle, luggage), a is acceleration. you look for solutions with a=0 here force F consists of: gravity: m* g* cos(α), g is gravitational acceleration, earth average: g=9.81m/s², α is the angle between path and vertical. air drag: ρ/2*c *A * v² where ρ is air density, c drag ...
Drag increases with speed. Drag is both rolling resistance and wind resistance. A steeper slope is more gravitational pull. Terminal velocity is when the gravitational pull equals the drag. On a mild slope it will be only a few miles an hour. On a very steep slope it might be over 50 mph. A 7% slope is around 20 mph on road bike on a road.
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