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A, B and C are three forces each of magn...

A, B and C are three forces each of magnitude 4N acting in the plane of paper as shown in fig.1.26 Point O lies in the same plane.
(i) Which force has the least moment about O? Give reason.
(ii) Which force has the greatest moment about O? Give reason.
(iii) Name the forces producing (a) clockwise , (b) anticlockwise moments.
(iv) What is the resultant torque about the point O?

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(i) C, because force C is nearest to O
(ii) A, because force A is farthest from O
(iii) (a) A and B (b) C (iv) 4.4 N m (clockwise)
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ICSE-FORCE -EXERCISE 1A
  1. State one way to reduce the moment of a given force about a given axis...

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  2. State one way to obtain a greater moment of a force about a given axis...

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  3. Why is it easier to open a door by applying the force at the free end ...

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  4. The stone of a hand flour grinder is provided with a handle near its r...

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  5. It is easier to turn the steering wheel of a large diameter than that ...

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  6. A spanner (or wrench) has a long handle. Why?

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  7. A jack screw is provided with a long arm. Explain why?

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  8. A, B and C are three forces each of magnitude 4N acting in the plane o...

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  9. The adjacent diagram Fig 1.27 shows a heavy roller, with its axle at O...

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  10. A body is acted upon by two forces each of magnitude F, but in opposit...

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  11. Draw a neat labelled diagram to show the direction of two forces actin...

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  12. What do you understand by the term couple? State its effect .Give two...

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  13. Define moment of couple. Write its S.I unit.

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  14. Prove that Moment of couple= Force times couple arm

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  15. What do you mean by equilibrium of a body?

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  16. State the condition when a body is in (i) static, (ii) dynamic equilib...

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  17. State two conditions for a body, acted upon by several forces, to be i...

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  18. State the principle of moments, Name one device based on it.

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  19. Describe a simple experiment to verify the principle of moments, if yo...

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  20. Complete the following sentences: (i) The S.I unit of moment of forc...

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