Activity 11.7 Class 9 Science Chapter 11Work and Energy

Activity 11.7 Class 9 Science Chapter 11

Activity 11.7 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 11.7, you will be able to answer the questions based on the activity.

Activity 11.7 Class 9 Science Work and Energy

 

You are suggested to study NCERT activity 11.7 class 9 science chapter 11Work and Energy explanation with a conclusion so that you can attempt questions based on activity 11.7 class 9 science. You should also go through activity 11.6 which is related to chapter 11.

Activity 11.7 Class 9 Science

    ·     Set up the apparatus as shown in the figure.

    ·     Place a wooden block of known mass in front of the trolley at a convenient fixed distance.

   ·     Place a known mass on the pan so that the trolley starts moving.

   ·     The trolley moves forward and hits the wooden block.

   ·     Fix a stop on the table in such a manner that the trolley stops after hitting the block. The block gets displaced.

   ·     Note down the displacement of the block. This means work is done on the block by the trolley as the block has gained energy.

   ·     From where does this energy come?

   ·     Repeat this activity by increasing the mass of the pan. In which case is the displacement more?

   ·     In which case is the work done more?

   ·     In this activity, the moving trolley does work and hence it possesses energy.

      

 Activity 11.7 Class 9 Science Chapter 11Work and Energy

   Observation of activity 11.7 class 9 science

When a mass is placed on the pan,  the trolley starts moving and hits the block, it gets displaced.

Explanation of activity 11.7 class 9 science

When a mass is placed on a pan, it exerts a force(F) on the trolley and the trolley starts moving. The kinetic energy is transferred to the block. This kinetic energy is due to the change in the potential energy of the pan and mass system.

When the mass is increased in the pan, this time more potential energy is converted into more kinetic energy. so the trolley hits the block with more force and the block gets displaced more.

In the second situation, more work is done because both force and displacement are more than in the first situation.

Conclusion of activity 11.7 class 9 science

This activity shows that due to much energy in the moving body causes more work done.

Related Topics 

1. Activity 11.8 Class 9 Science

2. Activity 11.6 Class 9 Science

2. NCERT Solutions of chapter 11