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प्रश्न
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उत्तर
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संबंधित प्रश्न
Define work.
When does a force perform work?
Write the expression for work done by a force.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
Is work a scalar or a vector quantity?
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Fill in the boxe to show the corresponding energy transformation.
(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’.
A green plant is carrying out photosynthesis.
