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. - Physics

Explain

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.

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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

Concept: Work

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Chapter 4: Energy - Short/Long Answer questions [Page 78]

Q 33.4 Q 33.3 Q 34.1

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Selina Concise Physics Class 8 ICSE

Chapter 4 Energy
Short/Long Answer questions | Q 33.4 | Page 78

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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. - Physics

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