All Solutions

Important

Friday, September 23, 2022

Activity 11.3 Class 9 Science Chapter 11Work and Energy

Activity 11.3 Class 9 Science Chapter 11


Activity 11.3 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 11.3, you will be able to answer the questions based on the activity.


Activity 11.3 Class 9 Science Work and Energy

 

You are suggested to study NCERT activity 11.3 class 9 science chapter 11Work and Energy explanation with a conclusion so that you can attempt questions based on activity 11.3 class 9 science.


Activity 11.3 Class 9 Science

    ·     Think of situations when the object is not displaced in spite of a force acting on it.

   ·     Also think of situations when an object gets displaced in the absence of a force acting on it. 

   ·     List all the situations that you can think of for each.

   ·     Discuss with your friends whether work is done in these situations.

  

Observation and explanation of activity 11.3 class 9 science


When we push a large stone or rock, it is not displaced while we apply a force on it.

A car, on a hilly road, moves without applying external force.


So we have these two conditions. Let us discuss


(i). When we apply force on a large stone or rock, it does not move an inch so there is no displacement. This means no work is done.


(ii). On a hilly road(slope), the car moves without external force being applied to it. In this condition, displacement is present but the force is absent.


We know that (i) Force and (ii) displacement both require work.


According to the equation


W=Fs   


Where

 W= work

 F= Force

 S= displacement


If F = 0 ,  s = 1m

W= 0 × 1= 0

so, work is zero


If F= 1N , s=0

W= 1 × 0= 0

so, work is zero


So we can easily understand that work will be zero when either force or displacement is absent. 


Conclusion of activity 11.3 class 9 science


So it can be concluded that both Force and displacement are necessary for work to be done. 


Related Topics 

1. Activity 11.4 Class 9 Science

2. Activity 11.2 Class 9 Science

2. NCERT Solutions of chapter 11


No comments:

Post a Comment