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Question
A boy sits and stands repeatedly. Draw a graph showing the variation of potential energy with time.
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Solution
RELATED QUESTIONS
What name is given to the heat energy obtained from hot rocks inside the earth?
Name the type of energy (kinetic or potential) possessed by the following:
A moving cricket ball.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given case:
An arrow shot out of a bow.
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A toy car spring is wound and car is made to run on level floor.
State the energy changes which take place when:
Burning of coal.
Give one example when:
Potential energy changes to electric energy.
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Mechanical energy to heat energy.
Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.
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A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
