what do you mean by friction and Write the rules of limiting friction
Answers
Limiting friction is defined as the friction which is generated between the two static surfaces that come in contact with each other. It is the product of the normal force and the coefficient of limiting friction. Following is the mathematical representation:
F = μN
Where,
F is the limiting friction
μ is the coefficient of limiting friction
N is the normal force
Following are the laws of limiting friction:
a
(a) The direction limiting frictional force and the direction of motion is always the opposite.
(b) The limiting friction always acts tangential to the two surfaces that are in contact.
(c) The magnitude of the limiting friction and the normal force between the two surfaces are directly proportional.
(d) The limiting friction is dependent on the material, nature of the surfaces that are in contact, and the smoothness.
(e) The limiting friction is independent of the shape and area of the surfaces.
(Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other)
Answer:
Friction is a tangential contact force which comes in play when there is relative motion between 2 surfaces in contact. It always opposes the relative motion. It is a self adjusting force.
The maximum value of static friction which can oppose the tendency of relative motion is called limiting friction.
Rules of limiting friction or Laws of limiting friction:
- Limiting friction is always greater than kinetic friction.
- The magnitude of limiting friction is directly proportional to the normal reaction between the two surfaces.
- The direction limiting frictional force and the direction of motion is always the opposite.
- The limiting friction always acts tangential to the two surfaces that are in contact.
- The limiting friction is dependent on the material, nature of the surfaces that are in contact, and the smoothness.
- The limiting friction is independent of the shape and area of the surfaces.
Formula for limiting friction:
F = μN
Where,
F is the limiting friction
μ is the coefficient of limiting friction
N is the normal force