Justify,giving proper reasoning,whether the work done in the following case is positive or negative: Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity.
- APositive
- BNegative
- CZero
- DCannot be determined
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Define kinetic energy and potential energy. Write an expression for $KE$ of a body of mass $m$ moving with speed $v$. Find the kinetic energy of a stone of $10 \, kg$ moving with a velocity of $10 \, m s^{-1}$.
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View SolutionWhat happens to the kinetic energy when
$(i)$ the mass of the body is doubled at constant velocity?
$(ii)$ the velocity of the body is doubled at constant mass?
$(iii)$ the mass of the body is doubled but the velocity is reduced to half?
$(i)$ the mass of the body is doubled at constant velocity?
$(ii)$ the velocity of the body is doubled at constant mass?
$(iii)$ the mass of the body is doubled but the velocity is reduced to half?
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Height of object $(m)$ $PE$ $(J)$ $KE$ $(J)$ Mechanical Energy $(J)$ $10$ ... ... ... $8$ ... ... ... $5$ ... ... ... Just above ground ... ... ...
Hence,state the law of conservation of energy.
| Height of object $(m)$ | $PE$ $(J)$ | $KE$ $(J)$ | Mechanical Energy $(J)$ |
| $10$ | ... | ... | ... |
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| Just above ground | ... | ... | ... |
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