Activity 12.2 Class 8 Science Chapter 12 Solution

Activity 12.2 Class 8 Science Friction

 In this post, you will find NCERT Science Class 8 Chapter 12Fricton activity 12.2 and after reading this, you can understand the concept of 'Friction' in daily life.

You are suggested to study NCERT activity 12.2 class 8 science explanation with a conclusion so that you can attempt questions based on activity 12.2 class 8 science.

Activity 12.2 Class 8 Science

·    Tie a string around a brick.

·    Pull the brick by a spring balance.

·    You need to apply some force.

·    Note down the reading on the spring balance when the brick just begins to move.

·     It gives you a measure of the force of friction between the surface of the brick and the floor.

·    Now wrap a piece of polythene around the brick and repeat the activity.

·     Do you observe any difference in the readings of the spring balance in the above two cases?

·    What might be the reason for this difference?

·    Repeat this activity by wrapping a piece of jute bag around the brick.

·     What do you observe?

 Activity 12.2 Class 8 Science Chapter 12Solution

Observation and Explanation 

When the brick is pulled on a surface that is rough, the reading in the spring balance is greater. It so happened because the force of friction is high on the rough surfaces.

When polythene is wrapped around the brick, the surface becomes smoother, and the friction force applied is lesser than in the previous situation.

Now a piece of jute is wrapped around the brick and the brick is pulled. This time reading of spring balance is more than that of the previous situation.

This activity explains that a rough surface exerts greater friction force than a smooth surface.

Conclusion 

It is concluded through this activity that a rough surface exerts greater friction force than a smooth surface.