HARD
Earn 100

What do you mean by work? If the direction of displacement is different from the direction of force then how the work is calculated? Explain with example.

Important Questions on Work and Energy

MEDIUM
Science>Physics>Work and Energy>Work
Derive a relationship between SI and CGS units of work.
EASY
Science>Physics>Work and Energy>Work
Heat and work done by the heat was discovered by
EASY
Science>Physics>Work and Energy>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>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>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>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>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>Work
Convert 1 kilowatt-hour into joules.
HARD
Science>Physics>Work and Energy>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
EASY
Science>Physics>Work and Energy>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>Work
When the force applied on a body is increased, the work done on it
EASY
Science>Physics>Work and Energy>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.

EASY
Science>Physics>Work and Energy>Work
A person of mass 50 kg climbs a tower of height 72 m. Calculate the work done. (take g=10 ms2).
EASY
Science>Physics>Work and Energy>Work

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

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

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

EASY
Science>Physics>Work and Energy>Work
What is the amount of work done on a body of mass 10 g moving in a circular path of radius 5 cm?
EASY
Science>Physics>Work and Energy>Work
What should be the angle between force and displacement, such that we obtain negative work?
MEDIUM
Science>Physics>Work and Energy>Work
In which of the following activities, work is said to be done?