What is Friction – Frictional Force – Types and Causes of Friction

What is Friction - Frictional Force – Types and Causes of Friction

What is Friction – Frictional Force – Types and Causes of Friction

Friction is a force like gravity or electromagnetism which allows the movement of one item over another. Researchers trust it is the consequence of the electromagnetic fascination between charged particles in two contacting surfaces. Let’s discuss about Friction and its concept in depth. Table of content:

  • What is Friction?
  • Types of Friction – Static Friction, Sliding Friction, Rolling Friction, Liquid Friction
  • Causes of Friction
  • Advantages and Disadvantages of Friction
  • Some Facts on Friction


Friction is a power that contradicts movement between any surfaces that are in contact. We can see many instances of friction in our real life. For instance, putting sand on a frigid walkway expands rubbing so you are less inclined to slip. An excessive amount of erosion between moving parts in a motor can make the parts wear out.

For each broad principle about friction, there are many exemptions. For example, while two uneven surfaces, (for example, sandpaper) are rubbed against one another produce more friction, whereas smooth materials, (for example, plates of glass) may really adhere to one another emphatically.



There are four kinds of friction: static, sliding, rolling, and liquid grating (Air/liquid erosion).
Static, sliding, and moving friction can be seen in solid surfaces. Liquid friction occurs in fluids and gases.



Static friction occurs in objects when they are laying on a surface. For instance, when you are climbing in the forested areas, there is static friction between your shoes and the path each time you put down your foot. Without this static friction, your feet would sneak out from under you, making it hard to walk. As friction is lesser in ice, it is dangerous to walk on ice as there is almost no friction.

    Sliding friction is friction that occurs in objects when they are sliding over a surface. Sliding friction is more susceptible than static friction. Hence it is simpler to slide a household item over the floor after you start it moving than it is to make it. Sliding friction can be helpful. For instance, you utilize slidingfriction when you write with a pencil. The pencil “lead” slides effectively over the paper, as there isfriction between the pencil and paper to leave an imprint.
    Sliding friction can also assist you with riding a bike as there is sliding friction between the brake cushions and bicycle edges each time you press your bicycle’s brakes. This erosion eases back the moving wheels so you can stop.


    Rolling friction occurs in the objects when they are turning over a surface. Rollingfriction is a lot more susceptible than sliding or static friction. Hence, most types of ground transportation use wheels. Metal rollers are another utilization of rolling friction.
    It is found that: RollingFriction<Sliding Friction<Static Friction.


    Liquid friction occurs in objects that are traveling through a liquid. A liquid is a substance that can stream and take the shape of its container.In case if you’ve ever attempted to push your open hand through the water in a tub or pool, you must have encountered liquid friction.
    In fluids, friction is the resistance between moving layers of a fluid, which is also known as viscosity. More viscous fluids are thicker, so honey has more fluid friction than water.The atoms inside a solid material can encounter friction too. For example, solid block of metal gets compressed, all the particles inside the material move, causing interior friction.
    In nature, there are no totally frictionless situations: even in profound space, little particles of matter may interact, causing friction.



Friction happens as no surface is completely smooth. Indeed, even surfaces that look smooth to the naked eye look unpleasant or rough when seen under a magnifying lens. This roughness of surfaces causes friction.
More uneven surfaces have more friction between them than smoother surfaces. That is the reason we put sand on frigid walkways and streets. You can’t slide as far across ice with shoes as you can on the cutting edges of skates. Ice skates help in decreasing friction. The harsher surface of the soles of the shoes causes more friction and eases you down.


Causes for decreasing Friction:

– Make the surfaces smoother. Uneven surfaces produce more contact and smooth surfaces lessen friction.
Oil is another approach to make a surface smoother. An oil is an elusive substance intended to decrease the friction between surfaces.

– Make the item increasingly smoothed out. A smooth out shape is one that permits air or water to stream around it effectively, offering the least opposition.

– Diminish the forceacting on the surfaces. The stronger the forces acting on the surfaces, the higher the friction, so reducing the forces would reduce the friction.

– Diminish the contact between the surfaces. Spheres are the best shape for diminishing friction on the grounds as very lessspherical object is in contact with the other surface.

– Methods to diminish friction between the moving parts inside a motor
To decrease grating, oil is added to the motor. The oil covers the surfaces of the moving parts and makes them tricky. They slide over one another easily, so there is less friction.



Frictional force has a significant impact in numerous regular procedures. For example, when two items rub together, rubbing makes a portion of the vitality of movement is changed over into heat. This is the reason rubbing two stones together for a long time can produce a fire.

Friction is liable for the mileage on bicycle gears and other mechanical parts. That is the reason oils, or fluids, are regularly used to lessen the erosion — and mileage — between moving parts. So, friction has its own pros and cons.


Advantages of Friction:

  • Friction is required for every kind of movement.
  • It causes us to walk on the ground.
  • Brakes in a vehicle utilize friction to stop the vehicle
  • Space rocks are scorched in the air before arriving at Earth because of friction.
  • It helps to create warmth when we rub our hands.
  • Matches are lit utilizing friction.


Disadvantages of Friction:

  • Friction produces superfluous warmth prompting the wastage of vitality.
  • The frictional force acts opposite than movement, so contact hinders the movement of moving articles.
  • Woods fires are caused because of the friction between tree limbs.
  • A great deal of cash goes into forestalling friction and the standard mileage brought about by it by utilizing methods like lubricating and oiling.



  • Heavier items produce more friction.
    Heavier items press along with more prominent power, and this causes more noteworthy friction between them. Have you at any point attempted to push furniture over the floor? It’s harder to defeat contact between a heavier household item and the floor than between lighter pieces and the floor.


  • Contact Produces Heat
    Contact produces heat as friction makes the particles on scouring surfaces move quicker, so they have more vitality. This gives them a higher temperature, and they feel hotter. That is the reason rubbing your hands together makes them hotter. Warmth from rubbing can be helpful. It not just warms your hands. Alternatively, heat from contact between moving parts inside a motor can be a major issue. It can make the vehicle over heat.



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June 2, 2020

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