मराठी

What is Meant by the Term ‘Moment of Force’? If the Moment of Force is Assigned a Negative Sign Then Will the Turning Tendency of the Force Be Clockwise Or Anti-clockwise?

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प्रश्न

What is meant by the term ‘moment of force’? If the moment of force is assigned a negative sign then will the turning tendency of the force be clockwise or anti-clockwise?

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उत्तर

It is equal to the product of the magnitude of the force and the perpendicular distance of the line of action of a force from the axis of rotation. If the moment of force is assigned a negative value, it means the clockwise tendency of force.

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पाठ 1: Force - EXERCISE [पृष्ठ १६]

APPEARS IN

लखमीर सिंह Physics [English] Class 10 ICSE
पाठ 1 Force
EXERCISE | Q 3. | पृष्ठ १६

संबंधित प्रश्‍न

An effort is applied on the bigger wheel of a gear having 32 teeth. It is used to turn a wheel of 8 teeth. Where it is used.


Thrust is the ............ force acting on a surface.


Define force.  


A wheel of diameter 2 m can be rotated about an axis passing through its center by a moment of force equal to 2.0 Nm. What minimum force must be applied on its rim?


State two factor on which moment of force about a point depends.


A, B and C are the three forces each of magnitude 4 N acting in the plane of the paper as shown in Figure. The point O lies in the same plane.

  1. Which force has the least moment about O? Give a reason.
  2. Which force has the greatest moment about O? Give a reason.
  3. Name the forces producing
    (a) Clockwise
    (b) anticlockwise moments.
  4. What is the resultant torque about the point O?

Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of the resultant moment of forces about the pivot O.


(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.


Assertion & Reasoning

  1. Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
  2. Reason: The principle of conservation of momentum is valid if the external force on the system is zero.

A nut is opened by a wrench of length 25 cm. If the least force required is 10 N, find the moment of force needed to turn the nut.


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