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प्रश्न
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
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उत्तर
Ideal machine has 100% efficiency i.e., work done on the machine = work done by the machine.
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.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
Differentiate between energy and power.
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
Give two examples of couple actions in our daily life.
State the conditions of equilibrium for a rigid body.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
