Activity 10.3 Class 9 Science Chapter 10 Gravitation

Activity 10.3 Class 9 Science Chapter 10 Gravitation

 

Activity 10.3 Class 9 Science belongs to Chapter 10 Gravitation Class 9 Science. You will get a complete solution with an explanation and conclusion. After reading activity 10.3, you will be able to answer the questions based on the activity.

Activity 10.3 Class 9 Science Gravitation

 

You are suggested to study NCERT activity 10.3 class 9 science chapter 10 explanation with a conclusion so that you can attempt questions based on activity 10.3 class 9 science.

 

Activity 10.3 Class 9 Science

   ·     Take a sheet of paper and a stone. Drop them simultaneously from the first floor of a building.   Observe whether both of them reach the ground simultaneously.

   ·     We see that paper reaches the ground a little later than the stone. This happens because of air resistance. The air offers resistance due to friction to the motion of the falling objects. The resistance offered by air to the paper is more than the resistance offered to the stone. If we do the experiment in a glass jar from which air has been sucked out, the paper and stone would fall at the same rate.

     

Observation Activity 10.3 Class 9 Science

Paper reaches the ground a little later than the stone.

 Why did this happen?

  let's understand

Explanation Activity 10.3 Class 9 Science

This happens due to the resistance offered by the air.  Air resistance is directly related to the area of the body or object.

If the area is larger then the resistance applied increases and on the other hand, if the area is lesser then the resistance applied decreases.

In this case, the area of the paper is more than that of stone, so the air resistance is larger on the paper and it falls down slowly.

We know that force is the product of mass and acceleration

F=ma

Here acceleration is due to gravity so

F = mg

Force applied on the free-falling object can be obtained by the following formula

    F= `\frac{GMm}{R^2}`    

 

When the same activity is done in the jar in which air is absent, we find that paper and stone reach the bottom at the same time because there is no air resistance present in the jar.

 

Conclusion  Activity 10.3 Class 9 Science

In this activity, we understood the effect of gravity on free-falling objects.

Related Topics for you

   1. Activity 10.4 Class 9 Science

   2 . Activity 10.2 Class 9 Science

   3. Solution of chapter 10