MEDIUM
Earn 100

Define work. Give SI unit of work done. Write an expression for positive work done.

Important Questions on Work and Energy

MEDIUM
Science>Physics>Work and Energy>Concept of Work
Derive a relationship between SI and CGS units of work.
EASY
Science>Physics>Work and Energy>Concept of Work
Heat and work done by the heat was discovered by
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Science>Physics>Work and Energy>Concept of Work
Spring constant of a spring is K = 6 ×103 N/m. Work done to stretch it 10-2 m from mean position is
MEDIUM
Science>Physics>Work and Energy>Concept of Work
A body is displaced by 10 m when maximum work of 200 joules is done on it. Calculate the force acting on this body.
HARD
Science>Physics>Work and Energy>Concept of Work

A force is applied upon a body of 40 kg then its velocity increases from 1
metre/second to 2 metre/second. Determine work done by the force.

HARD
Science>Physics>Work and Energy>Concept of Work
An object of 40 kg mass is moving with 5 m/s velocity. Now force is applied on the object such that its velocity increases to 10 m/s. Calculate the work done by the force.
EASY
Science>Physics>Work and Energy>Concept of Work
A force of 40 N acts on a body, and body moves through a distance of 2 metre at an angle of 45° in the direction of the force. The work done by the force is 
EASY
Science>Physics>Work and Energy>Concept of Work
Convert 1 kilowatt-hour into joules.
HARD
Science>Physics>Work and Energy>Concept of Work
A pump on the ground floor of a building can pump up water to fill the tank of 30 m3 in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, the power consumed by the pump is g=10 m/s2
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Science>Physics>Work and Energy>Concept of Work
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)
EASY
Science>Physics>Work and Energy>Concept of Work
When the force applied on a body is increased, the work done on it
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Science>Physics>Work and Energy>Concept of Work

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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Science>Physics>Work and Energy>Concept of Work
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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Science>Physics>Work and Energy>Concept of Work

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

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Science>Physics>Work and Energy>Concept of Work
When is the work done by a force on a body said to be positive? Give two examples.
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Science>Physics>Work and Energy>Concept of Work
What is the work done in holding a 15 kg suitcase while waiting for a bus for 15 minutes?
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Science>Physics>Work and Energy>Concept of Work

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

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Science>Physics>Work and Energy>Concept of Work
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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Science>Physics>Work and Energy>Concept of Work
What should be the angle between force and displacement, such that we obtain negative work?
MEDIUM
Science>Physics>Work and Energy>Concept of Work
In which of the following activities, work is said to be done?