Question

which of the following statements about friction is true
A. friction can be reduced to zero
B. frictional force cannot acceleration a body
C. frictional force is proportional to the surface
D. kinetic friction is always greater than rolling friction

Answer 1

I think (c) is the right answer but I not confirmed

Answer 2

which of the following statement about friction is true now the question comes and has three options a b c and d essays that friction can be reduced to zero no it is impossible to reduce the friction 20 because like you do not practical example if you just polish of a surface regular January regularly continuously you are polishing the surface now if you polishing surface to add it will seem to be polished and friction less but it has more smaller unit like structures or small Hole Hole small very very very small and if another surface of the Earth surface it like that surface attached to it and you know comes in contact with it and they both try to move it will create a large force of friction because of the number of authorised structures and does the friction cannot be reduced to zero now the option B option we say that frictional force cannot produce acceleration in body know it can produce acceleration in body But in opposite direction like a body is moving with 50 km per hour now the force of friction you know the frictional force and friction force produces negative acceleration of 5 M per second square so they can be the acceleration in the body proportional to the surface area structure like but if you take kinetic friction is always greater than rolling friction