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Define work.

Important Questions on Force, Work and Energy

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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula

From the following activity listed below, state whether or not work is done. Give your reason as well.

A ball is thrown upwards in the air.

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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula

State (with reason) whether work done in the following case is positive or negative:

Work done by the resistive force of air on a vibrating pendulum to bring it to rest. 

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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
What should be the angle between force and displacement to get minimum work?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
A magnetic crane lifts a mass of 1000 kg through a height of 50 m. Calculate the work done by the crane. (Take g=10 ms2)
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
In which of the following activities, work is said to be done?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
When the force applied on a body is increased, the work done on it
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula

Derive the formula to measure the work done when the body moves in the direction in which force is applied.

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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
What is the amount of work done on a body of mass 10 g moving in a circular path of radius 5 cm?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
Find out the work done when a force of 40 N displaces a body through 5 m in the direction of applied force.
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
What should be the angle between force and displacement, such that we obtain negative work?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
A person of mass 50 kg climbs a tower of height 72 m. Calculate the work done. (take g=10 ms2).
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
What is the SI unit of work?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula

When a body is thrown up, work done by the gravity of the earth on the body is

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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
When is the work done by a force on a body said to be positive? Give two examples.
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
What is the work done in holding a 15 kg suitcase while waiting for a bus for 15 minutes?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
Is it necessary for force to do work always?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
The work done when the earth moves around the sun is
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
What should be the angle between force and displacement to get maximum work?
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
The amount 1 J is equivalent to
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Environmental Studies>Exploring the World>Force, Work and Energy>Work and its Formula
160 joule of work is done when a force of 20 N is applied on an object. Calculate the distance through which the object moves and state its direction.