In the physics problems in my textbook, they give you a 'kinetic friction coefficient' that you can apply to kinetic friction situations at any speed. I was wondering if kinetic friction could be stronger or weaker at different speeds.
2007-03-05 02:57:13 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Friction is actually dependant on speed. However, unless we're talking about very high speeds, it can be very closely approximated as being constant. Friction is also more closely constant between solids than in a solid-fluid interaction.
For most aerodynamic applications, friction with the air is assumed to be dependant on velocity, or the square of velocity.
2007-03-05 03:19:13 · answer #1 · answered by Argon 3 · 1⤊ 0⤋
Well, the kinetic friction, as you well know, depends on the coefficient of friction with the surface, and on the mass.
In other words, if you have a block that is moving on a plane making and angle, it will gain speed, but the force of friction, will only depend on the mass, that is constant, and on the coefficient of friction.
The friction is only different when you want to start moving something. For example, you have a box and you wanna start moving it to the right. You have to use the static coefficient of friction, the static friction if you wanna find the force to start moving it.
2007-03-05 11:04:25 · answer #2 · answered by anakin_louix 6 · 0⤊ 0⤋
In motion, the kinetic friction is always the same . because it depends in the material of the surface . but at speed of zero (V=0) there is no kinetic friction . they call it static friction , and the amount of that is different from kinetic friction.
2007-03-05 11:08:19 · answer #3 · answered by Kiamehr 3 · 0⤊ 0⤋