How does the coefficient of kinetic friction vary with the mass of the block? Ho
ID: 1444259 • Letter: H
Question
Explanation / Answer
1)
The force of friction is proportional to the normal force. The coefficient of kinetic friction is the constant of proportionality. The CONSTANT of proportionality.
3)
Like all simple statements about friction, this picture of friction is too simplistic. Saying that rougher surfaces experience more friction sounds safe enough - two pieces of coarse sandpaper will obviously be harder to move relative to each other than two pieces of fine sandpaper. But if two pieces of flat metal are made progressively smoother, you will reach a point where the resistance to relative movement increases. If you make them very flat and smooth, and remove all surface contaminants in a vacuum, the smooth flat surfaces will actually adhere to each other, making what is called a "cold weld". Once you reach a certain degree of mechanical smoothness, the frictional resistance is found to depend on the nature of the molecular forces in the area of contact, so that substances of comparable "smoothness" can have significantly different coefficients of friction.
5)
coefficient of kinetic friction is directly related to mass, that is, if mass increases coefficient of kinetic friction will increase. and its directly related to the surface roughness, higher the roughness higher the coefficient.
am not sure about it's relation with speed, as far as i remember, i don't think there is a relation, not sure though.
6)
I'd say yes. The friction force is proportional to the normal force between the block and the floor. f = u*N = u*m*g. So as the mass increases, f increases, too
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