The friction between two surfaces __, when the surfaces are made highly smooth.

The ratio between the curved surface area and the total surface area of a right circular cylinder is 1:3, find the ratio between the length and radius of the cylinder.

The ratio between curved surface area and total surface area of right circular cylinder is 1:2 find the ratio between the height and the radius of the cylinder.

The angle of friction betwen two surfaces is 30^@ ,what is coefficient of friction?

A rectangular box lies on a rough incli ned surface. The co-efficient of friction between the surface and the box is mu. Let the mass of the box is be m. What is the force needed to be applied upwards along the plane to make the box move up the plane with acceleration alpha ?

A rectangular box lies on a rough incli ned surface. The co-efficient of friction between the surface and the box is mu. Let the mass of the box is be m. At what angle of inclination theta of the plane to the horizontal will the box just start to slide down the plane?

A rectangular box lies on a rough incli ned surface. The co-efficient of friction between the surface and the box is mu. Let the mass of the box is be m. What is the force needed to be applied upwards along the plane to make the box either remains stationary or just move up with unifrom speed?

A rectangular box lies on a rough inclined surface at theta . The co-efficient of friction between the surface and the box is mu. Let the mass of the box is m. What is the force acting on the box down the plane, if the angle of inclination of the plane is increased to alpha>theta ?