Activity 10.4 Class 9 Science Chapter 10 Gravitation

Activity 10.4 Class 9 Science Chapter 10 Gravitation

 Activity 10.4 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 10.4, you will be able to answer the questions based on the activity.

Activity 10.4 Class 9 Science Gravitation

 You are suggested to study NCERT activity 10.4 class 9 science chapter 10 explanation with a conclusion so that you can attempt questions based on activity 10.4 class 9 science.

 

Activity 10.4 Class 9 Science

   ·     Take an empty plastic bottle, and close the mouth of the bottle with an airtight stopper. Put it in a bucket filled with water. You see that the bottle floats.

   ·     Push the bottle into the water. You feel an upward push. Try to push it further down. You will find it difficult to push deeper and deeper. This indicates that water exerts a force on the bottle in the upward direction. The upward forces exerted on the bottle is pushed deeper till it is completely immersed.

   ·     Now, release the bottle. it bounces back to the surface.

   ·     Does the force due to the gravitational attraction of the earth act on this bottle? If so, why doesn’t the bottle stay immersed in water after it is released? How can you immerse the bottle in water?

 

 Activity 10.4 Class 9 Science Chapter 10 Gravitation

Observation Activity 10.4 Class 9 Science

 

The bottle starts floating in the water but when we apply external force to immerse it, at the same time we feel an upward force acting upon the bottle.

 

Explanation Activity 10.4 Class 9 Science

The gravitational attraction of the earth acts on the bottle in a vertically downward direction. When the bottle is released, it experiences an upward force which is called upthrust or buoyant force.

The upward force exerted by a liquid on a body that is immersed in the liquid is known as the upthrust or buoyant force.

The bottle displaces water of volume equal to its own volume.

The bottle starts floating because the weight of displaced water is equal to the upthrust.

When the bottle is released, it doesn’t stay immersed in water because at this time the buoyant force exerted by the liquid is more than the weight of the object.

We can immerse the bottle in water by filling it with water, then its weight will be more than the upthrust and it will sink.

Conclusion Activity 10.4 Class 9 Science

We can understand easily through activity 10.4 class 9 science that the relation between the weight of the object (weight of displaced water) and upthrust (buoyant) force is responsible for the floatation of the  object.

Related Topics for you

1. Activity 10.4 Class 9 Science

2. Activity 10.2 Class 9 Science

3. Solution of chapter 10