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Insights Subtleties Overlooked in Friction Questions: Object Slides Down Ramp
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An object sliding down a ramp at angle θ encounters kinetic friction on both the ramp and the level ground. The problem involves calculating the object's speed as it transitions from the ramp to the level surface, where it reaches speed u. The coefficients of friction, μ' on the ramp and μ on the level, play a crucial role in determining the final speed. The discussion emphasizes the need for a clear understanding of the forces acting on the object during its descent and upon reaching the level ground. The solution requires applying principles of physics, including energy conservation and frictional forces.
Power = Force v Speed
Power of my horse = 104kgx9.81m/s^2 x 0.732m/s = 1HP =746W
Force/tension in rope stay the same if horse run at 0.73m/s or at 15m/s, so why then horse need to be more powerfull to pull at higher speed even if backward force at him(rope tension) stay the same?
I understand that if I increase weight, it is hrader for horse to pull at higher speed because now is backward force increased, but don't understand why is harder to pull at higher speed if weight(backward force)...