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प्रश्न
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उत्तर
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संबंधित प्रश्न
State the conditions of equilibrium for a rigid body.
Name the force acting away from the centre of circular path.
What is the work done when the object acted upon by a force remains at rest?
Give an example
Light energy changes to electrical energy.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
