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प्रश्न
State one way to decrease the moment of a given force about a given axis of rotation.
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उत्तर १
Either decrease the force or decrease the perpendicular distance of force from the axis of rotation.
उत्तर २
decrease the perpendicular distance of force from axis of rotation.
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संबंधित प्रश्न
The S.I. unit of force is kgf. (kilogram-force)
Moment of force = force × perpendicular distance of force – from the pivoted point.
A rocket is moving at a constant speed in space by burning its fuel and ejecting out the burnt gases through a nozzle. Answer the following
1) Is there any change in the momentum of the rocket? if yes, what causes the change in momentum?
2) Is there any force acting on the rocket? if yes, how much?
Name and define the S.I. and C.G.S. units of force. How are they related?
State one way to reduce the moment of given force about a given axis of rotation.
The diagram shows two forces F1 = 5 N and F2 = 3N acting at point A and B of a rod pivoted at a point O, such that OA = 2m and OB = 4m
Calculate:
- Moment of force F1 about O
- Moment of force F2 about O
- Total moment of the two forces about O.
Give an example for each of the following uses of a machine:
to change the point of application of force
A meter scale is provided at 10 cm mark and is balanced by suspending 400 g from 0 cm mark (fig.). Calculate the mass of meter scale.
A person standing in front of a cliff fires a gun and hears its echo after 3 s. If the speed of sound in air is 336 ms−1.
- Calculate the distance of the person from the cliff.
- After moving a certain distance from the cliff, he fires the gun again, and this time the echo is heard 1.5 s later than the first. Calculate the distance that the person moved.
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.
