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m_wu
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Does the speed of a block of wood being pulled across a surface go twice as fast if you pull twice as hard? If yes/no, why?
Thanks to anyone who will answer that!
Thanks to anyone who will answer that!
Would the force of friction double if you double the constant velocity of the wooden block?
In the simplified freshman physics model, no. The kinetic friction is independent of velocity. In the real world, if you're just talking surface contact, I would imagine that the friction would actually decrease with velocity.Originally posted by m_wu
Would the force of friction double if you double the constant velocity of the wooden block?
By this, do you mean "viscosity" or something else. I've heard an old man call "viscosity" "pipe friction" (and then an argument ensued. Arguing with old men can be quite frustrating if you care to convence them).Originally posted by Stingray
Fluid friction
I didn't think this was the same thing as viscosity, but is was imprecise for me to say "viscosity" for force, when it is a coefficient, not a force. I thought that there could be drag without viscosity, though.Originally posted by Stingray
I meant viscosity as well as what would more precisely be called "pressure or inertial drag" (the main component of aerodynamic drag that's due to fluid being forced out of the way from an oncoming object).
Oh. I misunderstood. Sorry.Originally posted by Stingray
Yes, you're right. My "as well as" meant that I was mentioning two different things.
I don't know. I don't ever talk about fluid dynamics with anyone. My first year phys book speaks of viscosity as a coefficient, an makes a point of not calling it a force.Originally posted by Stingray
I think it is common practice to call a force viscosity, isn't it?
By this, do you mean "viscosity" or something else. I've heard an old man call "viscosity" "pipe friction" (and then an argument ensued. Arguing with old men can be quite frustrating if you care to convence them).
I think it is common practice to call a force viscosity, isn't it?
I was trying to explain to him that my "viscosity" was his "pipe friction." It was a disaster. He just wasn't havin' any of that newfangled technical jargon.Originally posted by HallsofIvy
Especially if they are right! "Pipe friction" doesn't cover everything, but it's a good off-the-cuff representation.
Friction force is the resistance force that occurs when two surfaces are in contact with each other. It acts against the direction of motion and can slow down or stop an object's movement.
The magnitude of friction force is determined by the force pressing the two surfaces together and the coefficient of friction, which is a measure of how easily the surfaces slide against each other.
With constant velocity, the friction force remains constant as long as the surfaces and other conditions remain the same. This is because the force of friction is equal and opposite to the force applied to keep the object moving at a constant speed.
No, friction force cannot be eliminated completely. It can be reduced by using lubricants or by using smoother surfaces, but there will always be some degree of friction between two surfaces in contact with each other.
The coefficient of friction varies with different surfaces, which means that the force of friction will also vary. For example, surfaces with a higher coefficient of friction, such as rubber on concrete, will have a higher friction force compared to surfaces with a lower coefficient of friction, such as ice on ice.