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प्रश्न
The stone of hand flour grinder is provided with a handle near its rim. Give reason.
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उत्तर
The stone of hand flour grinder is provided with a handle near its rim so that it can be rotated easily about the iron pivot at its centre by a small force applied at the handle.
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संबंधित प्रश्न
State two effects of a force when applied on a body.
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.
Write the expression for the moment of force about a given axis of rotation.
What are contact forces? Give two Example
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?
Classify the following amongst contact and non-contact forces.
magnetic force
One joule is the amount of work done when a force of ......... moves a body through a distance of .......
State when the moment of force is positive and when it is negative.
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 ______.
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.
