Activity 9.4 Class 9 Science Chapter 9 Force and Laws of Motion Solution

Activity 9.4 Class 9 Science Chapter 9 Force and Laws of Motion

Activity 9.4 Class 9 Science belongs to Chapter 9 Force and Laws of Motion   Class 9 Science. You will get a complete solution with an explanation and a conclusion. After reading activity 9.4, you will be able to answer the questions based on the activity.

Activity 9.4 Class 9 Science Chapter 9

 

You are suggested to study NCERT activity 9.4 class 9 science chapter 9 explanation with a conclusion so that you can attempt questions based on the activity 9.4 class 9 science.

Activity 9.4 Class 9 Science

   ·     Request two children to stand on two separate carts.

   ·     Give them a bag full of sand or some other heavy object. Ask them to play a game of catch with the bag.

   ·     Does each of them receive an instantaneous reaction as a result of throwing the sandbag(action)?

   ·     You can paint a white line on cartwheels to observe the motion of the two carts when the children throw the bag toward each other.

     

Activity 9.4 Class 9 Science

Observation Activity 9.4 Class 9 Science

When the boy throws the bag toward the girl, the cart of the boy moves backward and when the girl throws the bag towards the boy, the cart of the girl moves backward.

Explanation Activity 9.4 Class 9 Science

The boy and the girl throwing the bag is known as ‘action’ and the movement of the cart backward (in the opposite direction) is known as ‘reaction’.

When the bag is thrown, a force is applied but at the same time, an equal and opposite force is exerted on the cart.

This is the Third law of Newton.

According to this law, for every action, there is an equal and opposite reaction.

 

Important points of the third law of motion

   1. This law is applicable irrespective of the nature of the force.

   2. Action and reaction always act on different bodies.

   3.  Both the forces of action and reaction cannot cancel each other.

Conclusion Activity 9.4 Class 9 Science

This activity explains the third law of motion.

Related  Topic 

1. Activity 9.5 Class 9 Science 

2. Activity 9.3 Class 9 Science 

3.  Solutions of Chapter 9