Advertisements
Advertisements
Question
What are the quantities on which the amount of work done depends? How are they related to work?
Advertisements
Solution
The work done by a force on a body depends on two factors:
(i) Magnitude of force applied
(ii) Displacement in the direction of force applied
The relation between work (W), force (F) and displacement (S) is given by following equation:
W = F.S. cos θ
Where,
(W) - Work done
(F) - Force
(S) - Displacement
(θ) - Angle between the force applied and displacement of the body.
RELATED QUESTIONS
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
Define the term energy.
A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)
What do you mean by degradation of energy?
How much work is done when a body of mass m is raised to a height h above the ground?
What is the relationship between Nm and dyne cm?
What is the SI unit of work?
Write an expression for the work done against gravity.
Name the physical quantity associated with the 'rate of doing work'.
List any six forms of energy and write a short note on each of them.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
