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________ is said to be done when a force is acting on it. - Science

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प्रश्न

________ is said to be done when a force is acting on it.

पर्याय

  • Ramp

  • Simple machines

  • Work

  • Energy

  • Pulley

MCQ
रिकाम्या जागा भरा

उत्तर

Work is said to be done when a force is acting on it.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 3: Work and Energy - Evaluation [पृष्ठ १११]

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सामाचीर कलवी Science - Term 1 [English] Class 4 TN Board
पाठ 3 Work and Energy
Evaluation | Q I. 1. | पृष्ठ १११

संबंधित प्रश्‍न

Work done by a boy depends on the time in which he does work.


State two factors on which the work done on a body depends.


What are the two kinds of mechanical energy?


When is work said to be done by a force?


Define 1 joule of work.


What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.


Name five appliances or machines which use an electric motor.


Name the physical quantity whose SI unit is Nm.


What is the work done by the gravitational force of the earth on a satellite revolving around the earth?

What should be the angle between the directions of the displacement and the applied force so that the work done is zero?

Write the SI and CGS units of power. How are they related?

What change should be effected in the velocity of a body to maintain the same K.E., if its mass is increased four times?

What is meant by power?

Name the physical quantity whose SI unit is Nm.

A water pump raises 80 kg of water through a height of 20 m in 10 s. Calculate the power of the pump.

State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.


A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate:  the speed of the body.


Define Translational motion.


A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.

(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)

(ii) How much energy would be required in lifting the drum into the truck without the plank?

(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?

(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.

(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?


The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?


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