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प्रश्न
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
1 J = ______ calorie.
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
What is meant by a translational motion? Give one example.
A uniform circular motion is an accelerated motion. Justify it.
Name the force acting away from the centre of circular path.
When you move upstairs, do you perform some work?
Give two examples of work done.
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
Name two places in India where electricity is generated from nuclear power plants.
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
