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प्रश्न
Give an example of the following uses of a machine:
to change the direction of force
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उत्तर
A pulley is used to change the direction of application of force.
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संबंधित प्रश्न
A force is applied on (i) a non-rigid body and (ii) a rigid body. How does the effect of the force differ in the above two cases?
A force always produces both the linear and turning motions.
SI. unit of moment of force is
A tall building has wide foundations.
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?
Name and define the S.I. and C.G.S. units of force. How are they related?
The figure shows two forces each of magnitude 10 N acting at the point A and B at a separation of 50 cm, in opposite directions. Calculate the resultant moment of two forces about the point.
- A,
- B and
- O situated exactly at the middle of the two forces.

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What moment of force depresses the rule?
Classify the following amongst contact and non-contact forces.
normal reaction force,
A uniform metre rule rests horizontally on a knife-edge at the 60 cm mark when a mass of 10 gram is suspended from one end. At which end must this mass be suspended? What is the mass of the rule?
