Work Done By Frictional Force

Friction is the forcefulness that resists motion when the surface of i object comes in contact with the surface of some other. The mechanical reward of a machine is reduced past friction, or in other words, the ratio of output to input is reduced because of friction. An automobile uses ane-quarter of its energy on limiting friction. Yet, it is too friction in the tires that allows the car to stay on the road and friction in the clutch that makes it possible to bulldoze. From matches to machines to molecular structures, friction is one of the nigh significant phenomena in the physical world. In this article, let us discuss frictional forcefulness and its different types.

Table of Contents:

What is Frictional Force?
Calculating the Force of Friction
Are there Different Types of Frictional Force?

Dry Friction
Fluid Friction

Examples of Fluid Friction
Problems on Frictional Strength
Ofttimes Asked Questions – FAQs

What is Frictional Force?

Frictional force refers to the force generated by two surfaces that contact and slide against each other.

A few factors affecting the frictional forcefulness:

These forces are mainly afflicted by the surface texture and the amount of force impelling them together.
The angle and position of the object bear on the amount of frictional strength.
If an object is placed flat against an object, so the frictional forcefulness volition be equal to the weight of the object.
If an object is pushed confronting the surface, then the frictional force volition be increased and becomes more than the weight of the object.

Here is an engaging video explaining frictional strength in detail

Calculating the Force of Friction

The maximum amount of friction strength that a surface can apply upon an object can be easily calculated with the use of the given formula:

To assist you calculate the frictional force, hither nosotros accept provided methodical steps to follow while calculating the strength of friction.

Find the Normal Force

The normal force is the support forcefulness exerted upon an object that is in contact with another stable object. The normal forcefulness tin exist simply described in about cases by the post-obit formula:

N = mg

In this formula, g describes the mass of the object, and grand stands for the dispatch due to gravity. In the case of an inclined surface, the strength of the normal surface is reduced the more the surface is inclined, hence the formula becomes:

N = mg cos(θ)

θ represents the bending the surface is inclined to. In a elementary calculation, you would calculate the normal force of a 2-kg cake of wood sitting on a surface equally Northward = 2 kg × nine.8 N/kg = 19.half-dozen N

Finding the Right Co-efficient

The co-efficient that you would choose depends on the object and the specific situation. If the object isn't moving across the surface, y'all utilize the coefficient of static friction

\(\begin{array}{fifty}\mu _{static}\end{array} \)

, just if the object under consideration is moving you use the coefficient of sliding friction

\(\begin{array}{50}\mu _{slide}\stop{array} \)

. The type of materials used also affects the co-efficient. For case, if a cake was on a brick surface, the coefficient would be 0.6, but if information technology were on a block of clean wood, information technology would range from 0.25 to 0.five.

Calculating Frictional Forcefulness

As discussed, the formula for frictional force is given by F = μN.

As an example, let united states of america consider the block of wood that weighs two-kg resting on a table to exist pushed from rest. In this instance, we consider the static friction co-efficient. 0.v is the static co-efficient of forest.

With the given details, we can calculate the normal force as N = 2 kg × ix.8 Northward/kg = 19.6 N Now that we take the values of normal force and static friction co-efficient, nosotros can calculate the frictional force as follows:
F = 0.5 × 19.6 N = 9.8 N

frictional force

Are there Dissimilar Types of Frictional Forcefulness?

Yes, there are different types of frictional forces. The friction that takes identify betwixt solid surfaces is classified as Static, Kinetic, Rolling, and Sliding Friction . The friction that takes place between fluids and gases is termed every bit fluid friction. Hence, friction is broadly classified every bit:

Dry Friction
- Static Friction
- Kinetic Friction
- Rolling Friction
- Sliding Friction
Fluid Friction

Dry Friction

Dry friction describes the reaction between two solid bodies in contact when they are in move (kinetic friction) and when they are non (static friction). Both static and kinetic friction is proportional to the normal force exerted between the solid bodies. The interaction of unlike substances is modelled with unlike coefficients of friction. By this, we hateful that certain substances have a higher resistance to motility than others for the aforementioned normal force between them. Each of these values are experimentally adamant.
Read most the different types of dry out friction, from the links given below:

Fluid Friction

Fluid Friction is the force that obstructs the menstruation of fluid. It is a situation where the fluid provides resistance betwixt the 2 surfaces. If both the surfaces offering high resistance and so it is known equally high viscous and, generally, we phone call them greasy.

Examples of Fluid Friction

To avert creaking sounds from doors, nosotros lubricate the door hinges which leads to the smoothen performance of door hinges.
When y'all driblet the ball in a full bucket of water, water splashes out of the bucket and is all because of the buoyancy of fluid.

Problems on Frictional Force

one. A large block of ice is being pulled beyond a frozen lake. The block of ice has a mass of 300 kg. The coefficient of friction between 2 ice surfaces is pocket-sized: μ_k = 0.05. What is the strength of friction that is acting on the block of ice?

Solution: On a apartment surface, the normal force on an object is given by N = mg.
With this, we tin find the strength of friction equally follows:
F_f =μN
F_f =μmg
Substituting the values in the above equation we get,
F_f =0.05 × 300 kg × 9.8 m/due south²
= 147 kg-m/sⁱⁱ or 147 Due north.
The force of friction acting in the contrary management as the block of ice is pulled across the lake is 147 N.

two. A homo has to push his boat on the shore beyond the mud to go to the water. The coefficient of friction between the boat and the mud is given by μ = 0.400. If the gunkhole has a mass of 40 kg, calculate the magnitude of the force of friction interim on the boat.

Solution: On a flat surface, the normal forcefulness on an object is Northward = mg.
Using this, nosotros can calculate the force of friction as follows:
F = μN F = μ mg Substituting the values in the equation, we get F = (0.400)(40.0 kg)(nine.eighty g/s²)
F = 156.eight N
The frictional strength acting on the boat is 156.8 N.

Stay tuned with BYJU'S to acquire more near applications of friction, types of forces, and much more.

Go access to engaging video lessons for concept clarity such as this video on the basics of friction.

Frequently Asked Questions – FAQs

Land truthful or simulated: Surface texture affects the friction force.

What is the formula to calculate the frictional strength?

The frictional force is given past the formula: F = μN

What is fluid friction?

The friction that takes identify between fluids and gases is known as fluid friction.

What is static friction?

The friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative movement between the torso and the surface is known every bit static friction.

Is frictional force a scalar or a vector?

Frictional force is a vector since it involves both magnitude and direction.

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