Advertisements
Advertisements
प्रश्न
Define the term work. Name the CGS and SI unit of work.
उत्तर
'Work' is said to be done when the applied force makes the body move i.e., there is a displacement of body.
It is equal to the product of force and the displacement of the point of application of the force in the direction of force.
The SI unit of work is 'joules' and the CGS unit is 'erg'.
APPEARS IN
संबंधित प्रश्न
Derive a relationship between S.I. and C.C.S. unit of work
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
State the conditions of equilibrium for a rigid body.
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
What do you mean by a kilo joule?
On what factors does the work done by a force depend?
Can every force produce work?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Fill in the boxe to show the corresponding energy transformation.
State the energy changes which take place when A toy car with a wound spring moves on ground.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
A force can cause an object to change its ______.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
