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marshall4
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How far will a person slide if they are sliding at 3m/s and the coefficient of friction between the floor and their feet is 0.5
Sorry, Halls, that's wrong. The mass cancels.Originally posted by HallsofIvy
There's not enough information. You would have to know the person's weight (or mass) to calculate the actual friction force (friction coefficient times weight). That would determine the distance.
Originally posted by HallsofIvy
There's not enough information. You would have to know the person's weight (or mass) to calculate the actual friction force (friction coefficient times weight). That would determine the distance.
Originally posted by Doc Al
Not wrong, just a little wasted effort. Looking at your own equations, you can see that the mass cancels (as chroot pointed out) so it really is extraneous information.
Resist the temptation to start plugging in numbers prematurely. Figure things out symbolically as much as you can, then plug in the numbers.
Originally posted by marshall4
What does the mass cancel out with?
Originally posted by marshall4
What does the mass cancel out with?
Tires are quite special, because the deform, heat up, and become greasy as they are used. That does not mean that the area is important in determining friction -- in general, it is not.Originally posted by toa
The answers posted seem to be in nice accordance with the physics I was taught in high school. However, in practice they fail dismally, unless one at least brings the area of contact between the two surfaces into the equation. There is a reason formula one cars have tyres as wide as a barn door, and that the trimming of cars usually involves changing to wider tyres. I think there is some relationship which dictates that the greater the area, the greater the friction becomes. Does anyone know anything about this?
Friction is a force that opposes the motion of an object. It is caused by the interaction between two surfaces in contact with each other.
Friction acts in the opposite direction of an object's motion, so it can slow down the speed of the object. The amount of friction depends on factors such as the type of surface and the weight of the object.
Friction can also affect the distance an object travels. The more friction present, the shorter the distance an object can travel.
Friction can be reduced by using materials with smoother surfaces, adding lubricants, or reducing the weight of the object.
Static friction occurs when two surfaces are not moving relative to each other, while kinetic friction occurs when two surfaces are moving relative to each other. Kinetic friction is usually stronger than static friction.