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How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
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Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
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A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
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When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
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How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
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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.
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A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
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The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
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What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
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In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
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How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
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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?
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A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
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In case of negative work, the angle between the force and displacement is :
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A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
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The work done on an object does not depend on the :
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Each of the following statement describes a force acting. Which force is causing work to be done?
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A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
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How many watts equal one horse power?
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Name five appliances or machines which use an electric motor.
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