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ICSE Class 10 Physics Question 9 of 20

Force — Question 11

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Question

Question 11

A uniform metre rule balances horizontally on a knife edge placed at the 58 cm mark when a weight of 20gf is suspended from one end. (i) Draw a diagram of the arrangement. (ii) What is the weight of the rule?

Answer

(i) Diagram of the arrangement is shown below:

Uniform metre rule balances horizontally on knife edge. Force, Concise Physics Class 10 Solutions.

(ii) As we know, the principle of moments states that

Anticlockwise moment = Clockwise moment.

W×(58−50)=20gf×(100−58)⇒W=20×428⇒W=105gfW \times (58-50) = 20gf \times (100-58) \\[0.5em] \Rightarrow W = \dfrac{20\times42}{8} \\[0.5em] \Rightarrow W = 105 gf