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प्रश्न
Sleepers are used below the rails.
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उत्तर
Sleepers are laid below the rails to reduce pressure (force/area) on the ground.
∴ Sleepers increase the area.
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संबंधित प्रश्न
State two factors on which affect moment of force.
In Fig. a force F is applied in a direction passing through the pivoted point O of the body. Will the body rotate? Give reason to support your answer.
State one way to decrease the moment of a given force about a given axis of rotation.
State one way to obtain greater moment of a given force about a given axis of rotation.
State one way to reduce the moment of given force about a given axis of rotation.
A steering wheel of diameter 0.5 m is rotated anticlockwise by applying two forces each of magnitude 6 N. Draw a diagram to show the application of forces and calculate the moment of forces applied.
Define couple.
(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.
A couple of 15 N force acts on a rigid body, such that arm of couple is 85 cm. Calculate moment of couple in the SI system.
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.
