Friction Formula

Friction Formula – Friction is the force that opposes motion when one object’s surface comes into contact with another. Friction reduces a machine’s mechanical advantage, or the output-to-input ratio. An car spends one-quarter of its energy reducing friction. However, friction in the tyres helps the automobile to stay on the road, as does friction in the clutch, making driving feasible. Friction is one of the most important phenomena in the physical universe, affecting everything from matches to machinery to molecular structures. In this article, we will explore friction force and its various types.

Friction Formula

Friction Formula is defined as the force that provides resistance to two surfaces moving against each other. It is mostly due to intermolecular or IM attractions between particles on the two neighbouring surfaces. This force is classified into four types: static, sliding, rolling, and flowing. Static friction happens when an object begins to move, which indicates that the object must overcome the static force friction and begin moving in order for such friction to occur. When an object moves on the surface of another object, sliding friction occurs. This is known as ‘slide.’ As a result, the two items move or slide in opposite directions. Furthermore, rolling friction happens as an object moves.

As a result, the two items move or slide in opposite directions. Rolling friction happens when an object rolls across another surface or object. Finally, fluid friction happens when a fluid applies a friction force to an item. It can be air friction if the medium of motion is air, or viscous friction if the medium is water. The friction is affected by a number of variables. The first is called the normal force. It is the force exerted by neighbouring surfaces sliding against each other. Second, it is determined by the coefficient of friction, given by It describes the properties of the surfaces that glide against one other.

What is the Friction Formula?

Friction Formula is the opposing force that keeps solid surfaces, fluid layers, and material elements from slipping against each other while moving in the same direction. As two surfaces move relative to each other, friction converts kinetic energy into thermal energy, or work to heat. Friction Formula is useful and necessary for producing traction and allowing movement on the ground. Most land vehicles rely on friction for acceleration, deceleration, and direction change. A sudden lack of traction can result in a loss of control and an accident.

Friction is the resisting force that occurs when two objects interact with one another. Furthermore, the Greek letter ‘mu’ (μ), and it is unitless. In addition, the force of friction is η times the normal force on an object. Most noteworthy, the unit of friction is Newton (N). The friction formula is usually presented as:
The frictional force equation is given by:
\[ F_f = \mu F_n \]
Where, the magnitude of friction is Ff , the coefficient of friction is μ  and the magnitude of the normal force is Fn.

The Normal force is equivalent to the weight of the given body. Therefore, the Normal force (Fn) is articulated by:

Fn = mg

the mass of the object is m and g is the gravity.

The friction formula was made use of to compute the friction between any two given bodies.

Types of Friction

There are various types of Friction Formula and their properties. 

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Static Friction

Static friction occurs between a stationary object and the surface on which it is resting. Students can learn more about static friction with the help of study material available at the Extramarks website. 

Sliding Friction

Another type of friction is Sliding friction, which arises when two objects slide against each other. This is a very common type of Friction Formula which can be observed in our day-to-day lives. Students must visit the Extramarks website to learn about how science work and learn more about Friction Formula.

Rolling Friction

Rolling friction is the resistive force that slows the motion of a moving ball or wheel. It is also characterized as rolling resistance. Science appears to be a challenging subject, on the other hand students also find it interesting as science and its charateristucs can be observed in our daily lives. Students must refer to Extramarks website to learn with all the gripping study tools experts have curated for learning process.

Fluid Friction

Fluid friction is Friction Formula  that occurs between fluid layers as they move relative to each other. Subject matter experts at Extramarks have complied all the important topics such as Friction Formula for better understanding and learning of students.

Friction Force Formula

Consider a solid block that is balanced on a horizontal surface. When a force of ‘P’ is applied to the block, it does not move along with the force. This is due to the frictional force being more than the applied force used to balance the solid block When the applied force is increased, the frictional force increases as well. When the applied force exceeds the frictional force, then the solid block rolls across the horizontal surface. Limiting friction is the force that occurs as the body begins to move. Because one body is sliding over another that is motionless, this friction is referred to as static friction. To calculate the static friction force, we must consider all of the forces acting on the body.

Rolling Friction Formula

Consider a flat horizontal surface with a ball on it. When a ball is moved forward, the frictional force from the ground causes it to stop. This is referred to as rolling friction. Students can find detailed study material on topics such as Friction Formula on Extramarks website.

Friction Force Formula for an Inclined Plane

Suppose the mass m laying on an inclined plane. The frictional force F will act up the plane if the mass is moving down the plane. Experts at Extramarks have prepared several solved solution, sample papers, past years papers and revision notes for Friction Formula along with accurate diagrams to help students understand better.

Friction Formula Solved Problems

Problem 1: A man is pulling a box of mass 20 Kg. What is the standard force acting and also find the frictional force if the coefficient of friction μ is 0.3?


Given: Mass, m = 20 Kg,
Normal force, Fn =?
Normal force is given by Fn = mg
= 20 Kg × 9.8 m/s2
= 196 N.
The Frictional force is articulated by Ff = μ Fn
= 0.3 × 196 N.
= 58.8 N.

Problem  2: The mass of mohit 60 Kg is slipping on the frost. If the coefficient of friction acting is 0.3. Find the frictional force acting between him and the frost layer?


Given: Mass m = 60 Kg,
Coefficient of friction μ = 0.3,
The Normal force is articulated by Fn = mg
= 60 Kg × 9.8 m/s2
= 588 N.
The Frictional force is articulated by Ff = μ Fn
= 0.3 × 588 N
= 176.4 N.


Friction forces keep one hard object from sliding or rolling over another. Frictional forces, such as the traction needed to walk without falling, are beneficial, but they also produce significant resistance to motion. Around 20% of the engine power in a car is utilised to overcome frictional forces in the moving parts. Adhesion forces between the contact regions of the surfaces, which are often microscopically uneven, are the principal cause of friction between metals. Shearing these welded connections, as well as the imperfections of the rough surface ploughing through the softer surface, cause friction.

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