Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
A child reading a book while standing is not moving from its place i.e. displacement is zero. Hence the product of force and displacement is zero
W=F × S
W = mg × O = O
Hence, the child is not doing any work. Where as teacher is moving from its place is doing work
APPEARS IN
संबंधित प्रश्न
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Why is the work done on an object moving with uniform circular motion zero?
What is meant by a translational motion? Give one example.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
