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ICSE Class X Notes 2021 : Physics : Force

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Selina Solutions Concise Physics Class 10 Chapter 1 Force Exercise 1(A) Question: 1 Page no: 9 State the condition when on applying a force, the body has: (a)the translational motion, (b)the rotational motion. Solutions: (a) Translational motion is produced when the body is free to move. (b) Rotational motion is produced when the body is pivoted at a point. Question: 2 Define moment of force and state its S.I. unit. Solutions: The moment of force is equal to the product of the magnitude of the force and the perpendicular distance of the line of action of force from the axis of rotation. The S.I unit of moment of force is Newton meter = Newton meter (Nm) Question: 3 State whether the moment of force is a scalar or vector quantity? Solutions: The moment of force is a vector quantity. Question: 4 State two factors affecting the turning effect of a force. Solutions: The following are the two factors on which moment of force about a point depends (a) The magnitude of the force applied and, (b) The distance of the line of action of the force from the axis of rotation Question: 5 When does a body rotate? State one way to change the direction of rotation of a body. Give a suitable example to explain your answer. Solutions: The force applied on the body at a suitable point rotates the body about the axis passing through the pivoted point, when the body is pivoted at a point. By changing the point of application of force, the direction of rotation can be changed. Figures given below shows the anticlockwise and clockwise moments produced in a disc pivoted at its centre by changing the point of application of force F from A to B

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