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What is friction and its types?

‘Friction‘ is a force that resists motion of sliding or rolling of one object moving relative to another. It is a result of the electromagnetic attraction between the charged particles of two touching surfaces.   Types of Friction Static Friction : It is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other. The magnitude of the static force is equal in the opposite direction when a small amount of force is applied. When the force increases, at some point maximum static friction is reached. Rolling friction : It is the force that resists motion when an object rolls on a surface. Technically it’s not friction; its ‘rolling resistance’ since when a body rolls perfectly upon a surface, on paper, there is no sliding friction between that object and surface. Sliding friction : It is the frictional force between two surfaces that are rubbing against each other. It’s a very easy and common concept. It’s hard to find a perfectly sm
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Definition of Impulsive Force

Impulsive forces are huge forces acting on a body for a short period of time causing drastic momentum changes.

The SI unit of impulse is Newton-seconds (Ns) or kg m/s.

  • Example of Impulsive Force
  • Similar to the first one - Whle playing Carroms, the striker hits the coin for a very short time but sends it to the pocket.
  • Hitting a gong with the stick sets it ringing loudly.
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