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Friction

The friction is acting opposite to the ball rolling in the ground.

Friction is a force that resists motion. It always acts in the opposite direction to the motion. Friction is caused by bumps on the two surfaces(whic are in contact), rubbing as they slide across each other.

Friction means that objects slow down and lose kinetic energy. This energy does not disappear, but changes into heat. When someone rubs their hands, they feel warmth. This warmth has been created due to the friction created between the two rubbing hands.

Necessary EvilEdit

Friction is sometimes given a name "Necessary Evil" due to its both major advantages and disadvantages without which no motion is possible. Friction is often called 'the enemy of machines' yet some machines rely on it to work efficiently. A car brake is a good example. Friction also helps the wheels of a vehicle to roll, instead of sliding.

A surface without friction is dangerous to walk on as one tends to slide. One good example is of the Ice surface.

Types of FrictionEdit

  • Static Friction: Static friction is friction between two or more solid objects that are not moving relative to each other. For example, static friction can prevent an object from sliding down a sloped surface.[1]
  • Kinetic Friction: Kinetic (or dynamic) friction occurs when two objects are moving relative to each other and rub together (like a sled on the ground).
  • Rolling Friction: Rolling friction is the force that resists the rolling of a wheel or other circular object along a surface caused by deformations in the object and/or surface. Generally the force of rolling friction is less than that associated with kinetic friction.[2].
  • Fluid Friction : Fluid friction is the resistance to an object's motion through a liquid or gas.When the motion is occurring in a liquid, it is referred to as viscous resistance. Resistance to an object moving through a gas, such as air, is termed air friction. ction : Fluid friction is the resistance to an object's motion through a liquid or gas.When the motion is occurring in a liquid, it is referred to as viscous resistance. Resistance to an object moving through a gas, such as air, is termed air friction. 

References Edit

  1. Wikipedia:http://en.wikipedia.org/wiki/Dry_friction
  2. Book: World of Science by Parragon books Ltd. http://www.parragon.com/
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