Which everyday tool best illustrates a couple?
AA hammer striking a nail
BA water tap rotated by two fingers
CA door handle turned by one hand
DA football kicked by one foot
Answer & Solution
Correct answer: B. A water tap rotated by two fingers
1. A couple is two equal, opposite, parallel forces acting at different points.
2. The two forces together produce pure rotation without translation.
3. Turning a tap uses two fingers applying equal and opposite forces on opposite sides.
4. Hence rotating a water tap is the standard example of a couple.
_Source: Selina Concise Physics ICSE Class 10, Ch 1 'Force' (icsehelp.com chapter extract)_
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