Advertisements
Advertisements
Question
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
Solution
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
RELATED QUESTIONS
Power spent by a body depends on the time for which it does work.
State two conditions when no work is done by a force.
Nm is the unit of .......
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
Who is the odd one out?
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.
