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प्रश्न
Define force.
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उत्तर
Force is a physical cause that changes or may tend to change the state of rest or the state of motion of an object.
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संबंधित प्रश्न
State the S.I. unit of moment of force.
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(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.

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Define non-contact forces.
State one factor on which the magnitude of a non-contact force depends. How does the magnitude of a non-contact force change along with distance?
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Assertion & Reasoning
- Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
- Reason: The principle of conservation of momentum is valid if the external force on the system is zero.
Clockwise moment produced by a force about a fulcrum is considered to be ______.
A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is ______.
