the gradient of the slope
The channel roughness
The amount and size of bed load
By using kinetic friction
friction affects in any Circumtances
Yes. Weight, being a force perpendicular to the surface, affects the magnitude of the friction, but not the friction coefficient.
no, friction just changes the motion of an object.
Yes, linearly. The more it weighs, the more friction.
if there is friction on the hill it will slow you down
Friction, gravity, wind resistence(form of friction)
it affects motion by friction a friction pull it down or up
No. The velocity ratio remains constant but the friction absorbs power.
Friction acts in the direction opposite to that of the net force acting on the object.
Yes, friction affects stopping distance. The greater the friction the lower the stopping distance; the lower the friction the greater the stopping distance.
Friction affects most every thing. In a mechanical metronome you would not need a power source if there were no friction.