Balbharati solutions for General Science Integrated [English] Standard 6 Maharashtra State Board chapter 11 - Work and Energy [2023 edition]

1. What actions are seen in the picture? 
2. Is a force being applied while doing each action? 
3. In the various actions in the picture, has the object changed its original position?

1. Tie a string to an empty box, as shown in the picture.
2. Pull the box through a distance of 10 metres along a straight line.
3. Now fill the same box with 20 books.
4. Pull the box again through a distance of 10 metres in a straight line. What was your experience this time?
5. Now pull this loaded box through a straight distance of 20 metres.
6. When did you feel that more work was done?

1. In the above activity, which are the different forces acting on the box? 
2. Is a displacement possible without a force? 
3. If a force is applied with both the hands on a wall, will there be a displacement?
4. If no displacement occurs on applying a force, what does it indicate?

Take a pulley. Fix it at a height. Draw a string over the pulley. Tie a load of two kilograms at one end. Hold the other end of the string and pull it downwards to lift the load, first up to a height of one metre and then up to a height of four metres. When is more work done?

Why do you get hungry after physical exercise?

From where does our body get energy?

Why do we get tired?

What will happen as a result of the action in the picture?

1. Take two balls. Let one of them stand stable at the centre of a table.
2. Place the second ball on the table and push it so that it hits the first ball.
3. What happens when the second ball hits the first one?
4. From where did the second ball get the energy to set the first ball in motion?

In the game of marbles, from where does one marble get energy to set another marble in motion? 

While playing carrom, from where does the striker get the energy to make the pieces move?

1. Take a convex lens and hold it over a sheet of paper in sunlight.
2. Now, move the lens in such a way that there is a tiny spot of light on the paper.
3. Hold the lens in this position for a while. What happens?

Generally, grapes which appear in the market during December and January are sour. However, in March-April the grapes are sweet. Why is this so?

How does a picture appear on the screen of a TV, mobile, laptop and a cinema theatre?

In which form is energy stored in plant food?

How is energy obtained from cooking gas?

Note the amounts of your electricity bills of the last eight months and think about the consumption of electricity during each month.

A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)

If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)

You might have seen some beautiful fireworks during Diwali. It is an example of the transformation of ______ energy into ______ energy.

The solar cooker is an application of the ______ energy of the sun, while solar cells, solar lamps are applications of the ______ energy of the sun.

One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.

The capacity that an object has for doing work is called ______.

Match the pairs.

Can you tell?

When can we say that displacement has taken place?

Can you tell?

What should be taken into account for measuring work?

Can you tell?

What are the various forms of energy?

Can you tell?

Describe one natural chain of transformation of energy.

Can you tell?

Why should we save energy?

Can you tell?

What is ‘green energy’?

Can you tell?

What are the non-conventional energy resources?

Can you tell? 

Which forms of energy from the sun are used in solar energy devices?

Can you tell?

Why should we maximise the use of non-conventional energy resources?

Who is the odd one out?

Who is the odd one out?

Who is the odd one out?

Who is the odd one out?

Find out the types of energy from the following puzzle.

How can you save energy at home and in school? Discuss this with your friends and list all such measures. Put them into practice.

Find out about energy saving devices available in the market.