Question

To increase friction you could :

a.increase the mass of an object
b.put your objects on a wheel
c.make the surfaces smooth or slick

Answer 1

We would have to consider first, the word friction. This friction, would the signify on how a object would then be attracted by another, using it's own abilities that this friction, and also how strong this friction would then be. Therefore, this would actually only be handled, if the surface would then be as smooth as possible, and also, it would then have to have a slick surface, in order for a object to obtain a certain degree of friction.

Your answer: make the surfaces smooth or slick

Answer 2

Before going to answer this question first we have to know something about friction.

Friction is the opposing force which is due to interlocking of irregularity and wielding effect.In our naked eye a surface may look smooth, but at microscopic level, it has elevations and depressions.

A rough surface has more friction as compared to a smoother surface as smoother surface has less irregularity.

Again we know that that rolling friction is less than sliding friction.so whenever the object will be placed on a wheel,so there will be less friction.

Again we know that the frictional force is directly proportional to the normal reaction.

The empirical formula for frictional force F= coefficient of friction × normal reaction
`i.e F=\mu*N`

so whenever the mass increases ,correspondingly there will be increment in normal reaction which results in the increment in kinetic friction.

But one thing we have to remember that friction is also dependent on contact area.As long as the contact area is same ,there will be no increment in friction due to increment in mass.

So the first answer is partially correct.