alleryA force of 20 N is applied perpendicular to a spanner at a distance of 0.25 m from the bolt. What is the moment about the bolt?
A4 Nm
B80 Nm
C50 Nm
D5 Nm
Answer & Solution
Correct answer: D. 5 Nm
1. Moment of a force = Force × Perpendicular distance from the pivot.
2. Given F = 20 N, d = 0.25 m.
3. Moment = 20 × 0.25 = 5 Nm.
4. Units are Newton metre, abbreviated Nm.
5. Hence the correct value is 5 Nm.
_Source: Selina Concise Physics ICSE Class 10, Ch 1 'Force' (icsehelp.com chapter extract)_
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