Activity 11.1 Class 9 Science Chapter 11Work and Energy

 Activity 11.1 Class 9 Science Chapter 11

Activity 11.1 Class 9 Science belongs to Chapter 11 Work and Energy Class 9 Science. You will get a complete solution with an explanation and conclusion. After reading activity 11.1, you will be able to answer the questions based on the activity.

Activity 11.1 Class 9 Science Work and Energy

 

You are suggested to study NCERT activity 11.1 class 9 science chapter 11Work and Energy explanation with a conclusion so that you can attempt questions based on activity 11.1 class 9 science.

Activity 11.1 Class 9 Science

·     we have discussed in the above paragraphs a number of activities which we normally consider to work in day-to-day life. For each of these activities, ask the following questions and answer them.

i.              What is the work being done?

ii.          What is happening to the object?

iii.       Who(what) is doing the work?

Observation and explanation of activity 1.5 class 9 science

In day-to-day life, we perform many physical and mental activities that needed energy.

To understand this, we consider the following examples-

i.   Reading books, discussing any topic with friends, watching T.V. etc are mental activities. These activities needed energy but these are not considered as ‘work’

ii.   Pushing a pebble, pushing a box, lifting a book, and pulling a trolley are some examples that are considered as ‘work,

When we push a pebble, we exerted a force and the pebble got displaced.

When we push a box, we apply some force and the box got displaced to some distance.

In pulling a trolley and lifting a book, a force is exerted and the things got displaced.

So now we can say ‘ when a force is applied to any object and the object got displaced, then work is done.’

After understanding this, we can answer the questions asked above.

i.              Work is being done on the pebble, box, book, etc.

ii.          Pebble/box/book move or got displaced.

iii.       The applied force is doing the work.

 

Conclusion of activity 1.5 class 9 science

We can conclude that ‘work is said to be done only when the force acting on a body produces motion to it.’

Related Topics 

1. Activity 11.2 Class 9 Science

2. NCERT Solutions of chapter 11