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प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
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उत्तर
Suma is moving forward while swimming by applying force in a particular direction and is getting displaced in the direction of force hence, work is being done.
संबंधित प्रश्न
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
A coolie does no work against the force of gravity while carrying a luggage on a road.
State two conditions when no work is done by a force.
Differentiate between energy and power.
Name the force acting away from the centre of circular path.
What is the ratio of SI units to CGS units of 'work'?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
What is work?
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
