NCERT Solutions for Class 9 Science Chapter 9
Force and Laws of Motion
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-128
Questions No-2
When a carpet is beaten with a stick, dust comes out of it. Explain.
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When a carpet is beaten with a stick, the mechanical action causes the emergence of dust and particles that have accumulated within the carpet over time. Several factors contribute to this phenomenon.
Accumulated Debris:
Carpets accumulate dust, dirt, and particles within their fibers and beneath the surface due to daily use and environmental factors.
Mechanical Disturbance:
The impact of beating the carpet with a stick creates mechanical disturbance and vibration within its structure.
Loosening Particles:
This mechanical force causes the carpet fibers to flex, dislodging and releasing the trapped particles embedded within the carpet’s structure.
Airborne Release:
The sudden impact and vibrations generate a disturbance, ejecting the dislodged particles into the air.
Dislodging from Pile:
Particles trapped within the carpet pile due to gravity or electrostatic forces are forcefully dislodged by the kinetic energy applied during beating.
Conclusion:
Beating a carpet dislodges and releases accumulated dust and debris trapped within its fibers. This mechanical action causes the particles to loosen and become airborne, contributing to a cleaner carpet surface. Regular cleaning methods, including beating or vacuuming, aid in maintaining a cleaner and healthier indoor environment by removing embedded dust and particles from carpets.
Inertia of an object tends to resist any change in its state of rest or state of motion.
When a carpet is beaten with a stick, then the carpet comes to motion. But, the
dust particles try to resist their state of rest. According to Newton’s first law of
motion, the dust particles stay in a state of rest, while the carpet moves. Hence,
the dust particles come out of the carpet.
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