What Is Ff In Physics

Friction is the force that resists motion when the surface of ane object comes in contact with the surface of another. The mechanical advantage of a machine is reduced by friction, or in other words, the ratio of output to input is reduced considering of friction. An car uses 1-quarter of its energy on limiting friction. Yet, it is also friction in the tires that allows the car to stay on the road and friction in the clutch that makes information technology possible to drive. From matches to machines to molecular structures, friction is 1 of the most meaning phenomena in the physical world. In this article, let us discuss frictional force and its dissimilar types.

Table of Contents:

What is Frictional Force?
Computing the Force of Friction
Are at that place Unlike Types of Frictional Force?

Dry Friction
Fluid Friction

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

What is Frictional Force?

Frictional force refers to the force generated past ii surfaces that contact and slide against each other.

A few factors affecting the frictional force:

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

Here is an engaging video explaining frictional forcefulness in detail

Computing the Force of Friction

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

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

Find the Normal Force

The normal force is the support force exerted upon an object that is in contact with some other stable object. The normal force tin can be simply described in most cases by the post-obit formula:

N = mg

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

N = mg cos(θ)

θ represents the angle the surface is inclined to. In a simple adding, you would calculate the normal force of a two-kg block of wood sitting on a surface equally N = 2 kg × 9.8 N/kg = 19.vi Northward

Finding the Right Co-efficient

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

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

, but if the object nether consideration is moving you lot apply the coefficient of sliding friction

\(\begin{array}{l}\mu _{slide}\cease{assortment} \)

. The type of materials used also affects the co-efficient. For case, if a block was on a brick surface, the coefficient would be 0.vi, but if it were on a block of clean woods, it would range from 0.25 to 0.5.

Computing Frictional Force

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

As an example, let u.s.a. consider the block of wood that weighs 2-kg resting on a table to exist pushed from balance. In this case, we consider the static friction co-efficient. 0.five is the static co-efficient of wood.

With the given details, we can calculate the normal force as N = two kg × 9.8 Northward/kg = 19.6 N Now that we have the values of normal force and static friction co-efficient, we can calculate the frictional force as follows:
F = 0.5 × nineteen.6 N = 9.viii North

frictional force

Are there Different Types of Frictional Force?

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

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

Dry out Friction

Dry friction describes the reaction between ii solid bodies in contact when they are in motion (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 different substances is modelled with different coefficients of friction. By this, we mean that certain substances have a higher resistance to movement than others for the aforementioned normal force between them. Each of these values are experimentally determined.
Read nearly the different types of dry friction, from the links given below:

Fluid Friction

Fluid Friction is the force that obstructs the menstruum of fluid. It is a state of affairs where the fluid provides resistance betwixt the two surfaces. If both the surfaces offer high resistance and so information technology is known as loftier viscous and, generally, nosotros call them greasy.

Examples of Fluid Friction

To avoid creaking sounds from doors, we lubricate the door hinges which leads to the smooth operation of door hinges.
When you drop the ball in a total bucket of water, water splashes out of the bucket and is all because of the buoyancy of fluid.

Problems on Frictional Force

ane. A big block of water ice is beingness pulled beyond a frozen lake. The block of water ice has a mass of 300 kg. The coefficient of friction between ii ice surfaces is small: 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 can find the strength of friction as follows:
F_f =μN
F_f =μmg
Substituting the values in the above equation we get,
F_f =0.05 × 300 kg × 9.viii m/due south²
= 147 kg-m/s² or 147 Northward.
The force of friction acting in the opposite direction equally the block of ice is pulled across the lake is 147 N.

2. A homo has to button his boat on the shore across the mud to become to the water. The coefficient of friction between the boat and the mud is given by μ = 0.400. If the boat has a mass of xl kg, calculate the magnitude of the forcefulness of friction interim on the boat.

Solution: On a apartment surface, the normal strength on an object is Due north = mg.
Using this, nosotros tin can calculate the forcefulness of friction as follows:
F = μN F = μ mg Substituting the values in the equation, nosotros get F = (0.400)(40.0 kg)(9.80 m/s²)
F = 156.8 N
The frictional force interim on the boat is 156.8 N.

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

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

Frequently Asked Questions – FAQs

State true or false: Surface texture affects the friction force.

What is the formula to calculate the frictional forcefulness?

The frictional forcefulness is given by the formula: F = μN

What is fluid friction?

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

What is static friction?

The friction experienced when individuals effort to move a stationary object on a surface, without actually triggering whatever relative motion between the body and the surface is known every bit static friction.

Is frictional force a scalar or a vector?

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

Stay tuned with BYJU'Southward to larn more interesting science topics with engaging videos!