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Physics Chapter 11: Work, Energy, and Power

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Physics Chapter 11: Work, Energy, and Power

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Questions and Answers

Why do living beings and machines need energy?

To prevent overheating of the body or machine

To slow down the metabolic rate

To conserve energy for later use

To perform life processes and activities (correct)

What is the relationship between work, energy, and power?

They are unrelated concepts

Work is the same as energy, while power is the rate of doing work (correct)

Power is the amount of energy stored in an object

Work is only related to human activities, while energy is a scientific concept

Why do some engines require fuel like petrol and diesel?

To release energy that can be converted into useful work (correct)

To make the engine look more attractive

To add weight to the engine for stability

To keep the engine cool during operation

Why are strenuous activities by living beings or animals more energy-consuming?

Because strenuous activities involve more force and motion, requiring more energy Signup and view all the answers

According to the scientific definition of work, which scenario describes doing work?

Climbing up a tall tree to see the landscape Signup and view all the answers

In the context of science, why is pushing a huge rock that does not move not considered as doing work?

There is no displacement of the rock Signup and view all the answers

Which of the following activities is considered work in day-to-day life but may not involve work according to science?

Humming a tune Signup and view all the answers

What does the text suggest about the concept of 'work' in science and everyday life?

'Work' is defined differently in science and everyday life Signup and view all the answers

Why might climbing up the steps of a staircase be considered as doing work according to science?

It involves physical effort Signup and view all the answers

Which activity would most likely be classified as 'work' based on both scientific and day-to-day life definitions?

Pushing a car that ran out of fuel Signup and view all the answers