Why do we beat carpet to remove dust particles

theloveforphysics

  Before beating the carpet , both dust particles and carpet are at rest. Hence the dust  particles have inertia of rest. When carpet is beaten, its comes to motion but due to inertia of rest, dust particles remains at rest and are separated.

It is advantageous to run before taking a long jump. Why?

When we run, our body gains inertia of motion due to which it wants to be in motion continuously. When we take long jump our body has the tendency to be thrown forward more.