12. A spanner has a long handle. Why?
13. State the principle of moments. Name one device based on it.
14.(i) On what factor does the position of the centre of gravity of a body depend?
(ii) Where does the position of centre of gravity lie for
(a) a circular lamina (b) a triangular lamina?
Answers
Answer:
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Explanation:
12 ans -------> Spanner has a long handle to produce larger turning moment and small force is applied at the end of handles.
12 ans -------> Spanner has a long handle to produce larger turning moment and small force is applied at the end of handles.13 ans --------> According to the principle of moments. ... A physical balance (or beam balance) works on the principle of moments.
12 ans -------> Spanner has a long handle to produce larger turning moment and small force is applied at the end of handles.13 ans --------> According to the principle of moments. ... A physical balance (or beam balance) works on the principle of moments.14 ans ---------> (I) The position of the centre of gravity of a body of given mass depends on its shape i.e., on the distribution of mass in it. For example, the centre of gravity of a uniform wire is at its mid-point. But if this wire is bent into the form of a circle, its centre of gravity will then be at the centre of the circle.
12 ans -------> Spanner has a long handle to produce larger turning moment and small force is applied at the end of handles.13 ans --------> According to the principle of moments. ... A physical balance (or beam balance) works on the principle of moments.14 ans ---------> (I) The position of the centre of gravity of a body of given mass depends on its shape i.e., on the distribution of mass in it. For example, the centre of gravity of a uniform wire is at its mid-point. But if this wire is bent into the form of a circle, its centre of gravity will then be at the centre of the circle.----------> (ii) For regular shaped bodies centre of gravity lies in the centre of the particular body. Hence for triangular lamina centre lies at the centroid which is the intersection of the three lines drawn from the vertex to the midpoint of the opposite side. Hence centre of gravity lies at the intersection of the three medians.