Advertisements
Advertisements
Question
Define the term work. Name the CGS and SI unit of work.
Solution
'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
RELATED QUESTIONS
Define 1 J of work.
Why is a jack screw provided with a long arm?
What is the work done by the moon when it revolves around the earth?
State the S.I. unit of work and define it.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
How many watts equal one horse power?
Give two examples of couple action in our daily life.
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
Fill in the boxe to show the corresponding energy transformation.
Give an example
Chemical energy changes to heat energy.
Is power a scalar or a vector quantity?
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
A ______ should act on an object.
