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UPSC CDS 1 2020 GK Paper

Question : 13 of 120

Marks: +1, -0

The unit of the force constant k of a spring is

Solution:

Concept:

The force constant

k

of a spring relates force to displacement via Hooke's law.

Explanation:

Hooke's law states

F = kx

, where

F

is force in newtons (N) and

x

is displacement in metres (m).

Rearranging gives

k = \frac{F}{x}

Therefore, the unit of

k

\frac{\text{N}}{\text{m}}

or N/m.

Answer:

B. N/m

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