The carpet moves while the dust particles remain stationary due to inertia, causing a separation of dust from the carpet. Why does this happen?
Correct answer: D. The beating loosens the fibers of the carpet causing the dust trapped in them to come loose
- A. None of these.
- B. The beating movement charges the carpet by friction and repels the dust off of it
- C. The beating causes a reaction force by the carpet which also applies to the dust particles, causing their expulsion
- D. The beating loosens the fibers of the carpet causing the dust trapped in them to come loose
Explanation
The inertia of the dust particles residing on the carpet resists the change in the carpet's motion. Therefore, the carpet's forward motion exerts an apparent backward force (no real force is exerted, this is just apparent due to inertia) on the dust particles, setting them in motion in the opposite direction. This is why the dust comes out of the carpet when beaten.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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