GEOLOGY

Detailed explanation-1: -A rough surface will have more friction because on the rough surface there will be more irregularities. They will cause interlocking which in turn creates more frictional force. For a smooth surface, irregularities and interlocking is less and hence has very less friction.

Detailed explanation-2: -Friction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, rougher the surface means more is the friction. Thus, the smoothness of the surface reduces the frictional force.

Detailed explanation-3: -Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to.

Detailed explanation-4: -Smooth surfaces produce the least friction.

Detailed explanation-5: -Frictional Force: When an object is moving across a smooth horizontal surface, the coefficient of friction is zero since a smooth surface does not exert any kinetic friction.