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प्रश्न
Give two examples of couple action in our daily life.
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उत्तर
Examples of couple action in daily life:
(i) Opening and closing the cap of a bottle
(ii) Turning a key in a lock
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संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Name five appliances or machines which use an electric motor.
What is meant by a translational motion? Give one example.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
Write the two main conditions are needed for work to be done?
