Madhya Pradesh Police Exam Model Paper 4

The correct answer is ​Increases, Increase.

• The frictional force increases with the increase in roughness of the surfaces.
• The Force that opposes the motion of an object is called frictional force.
• Friction is a contact force.
• Friction acts always opposite to the motion.
• The effect of fiction is mainly due to the irregularities on the two surfaces in contact.
• Friction depends on the nature of surfaces in contact.
• Force of friction is greater if a rough surface is involved.
• The value of frictional force is more between rough surfaces.
• The substances which reduce friction are called lubricants.