Question

why do the dust particle fall of from a carpet when it is beaten with a stick.
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Answer 1

Answer:

When a hanging carpet is beaten with a stick, the dust particles are removed from it because the carpet on beating suddenly moves forward and the dust particles due to inertia of rest continue to remain at rest. Hence the dust particles fall down and the carpet gets cleaned.

Answer 2

Answer:

If a carpet is beaten with a stick then the carpet begins to move.... The dust particles remains in a state of rest , while the carpet moves , as per Newton's first law of motion. The particles of dust thus emerge from the carpet.