What principle is used In a newton spring balance?

The mass of an object depends on its density.

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The mass of an object depends an the gravity pulling

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The weight of an object is directly proportional to its mass.

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The extension of the spring is directly proportional to the force pulling it.

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Solution

The correct option is D The extension of the spring is directly proportional to the force pulling it.
$\begin{matrix} In a spring balance, \begin{matrix} F_{s} = k x = W \Rightarrow F_{s} & \propto x F_{s} & \to spring force k \to & spring constant x \to extention of spring and W is weight of object \end{matrix} \end{matrix}$

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What principle is used In a newton spring balance?

The correct option is D The extension of the spring is directly proportional to the force pulling it. In a spring balance, Fs=kx=W⇒Fs∝xFs→ spring force k→ spring constant x→ extention of spring and W is weight of object