Chapter - 5 Akber - Birbal

Kavita - 1 Vah Shakti

Chapter - 3 Khelo Me Bhartiya Mahilaye

May Holiday Homework

Class IV

May Holiday Homework

English – Worksheet

Hindi – Varna se Varna mila ke shabd likhe (Akshar Deepika- page 13)

Mathematics –  worksheet from workbook Chapter 1: Numbers and holiday homework worksheet which is to be done in punch paper.

Science – Make a chart on Human Body System (select any one system). Draw and write about it on A-4 size chart paper

Computer – Learn question-answers of Chapter 1

Summer Activities

Work and Energy

What is force?

Force means to push or pull something.

Which other two actions have been mentioned that require force?

To stop something and to change the direction also requires force

ØQ1. How was force applied on the balloon?

Blowing with the mouth so the shape of the balloon changed.

ØQ2. How was force applied on the table and chair?

Table was pushed and pulled, chair was lifted.

ØReinforce the definition of force

–Force is a push or a pull. It can change the direction of a moving object.It can stop a moving object.It can also change the shape of an object

Q4.In the above actions did the objects on which force was being applied show any movement

or change its shape?

Yes when we apply force on an object and there is movement of object then it is said that some work has been done. Today we will learn what is work and when can we say that work is done.Work is said to be done only if the force exerted on an object moves that object form its position. i.e there is displacement of the object.

Give some examples of work where the object moves from its position?

(pushing a trolley, stitching, carrying things etc.)

Why do we eat food?

(Because it gives us energy)

What does the word solar mean?

Solar means the energy related to the Sun

ØWhat are the things that are important for us to survive on earth.

(air,water, food and light)

ØHow the sunlight is helpful to the plants.(it helps them to grow and toprepare food)

Photosynthesis isthe process by which green plants use carbon dioxide in the air and water

and minerals from the soil to produce their own food in the presence of sunlight. Sunlight is absorbed with the help of chlorophyll, a green pigment present in the leaves. The food prepared by the leaf is stored in different parts of the plant and oxygen gas is given out in the process

Hence it is not only helpful to plants and animals but to all the living creatures on the earth

he rainwater that is stored in the dam is used as a source of energy to produce electricity.

The water is held behind a dam, forming an artificial lake, or reservoir. The water is released from the dam which spins the blades of a giant turbine. The turbine is connected to the generator that makes electricity as it spins.This energy is also called hydro energy.

1. What do we do to regain our lost energy?

Eat the right kind of food and rest enough.

Ø

What food is the right kind of food?A balanced diet.

ØDo we eat them raw?

Some are eaten raw while some are cooked.

ØWhat are the different methods of cooking?

Boiling, roasting, frying steaming.

ØWhat is the important thing required

for cooking?

Cooking gas

ØDo people in the rural areas also use gasfor cooking?

No, they burn wood.

ØWhat does the blue colour on the globe denote?

The part of the earth covered with water.

ØHow much of the earth is covered with water?

Three fourth of the earth is covered with water.

the heat generated from the earth is called geothermal energy

ØWhy do we need these batteries?For the functioning of all battery operated things.

ØWhat do we do when a battery operated toy or a watch stops

working?

We change the battery.

Ø

What do we do when our mobile screen or laptop screen goes blank

at the end of the day?

We recharge it using batteries

Øthat all battery operated things will stop working because they

function with the energy stored in the batteries.

Øthat batteries store energy in them which can be utilized whenever

we need energy to make use of things that are battery operated.

(if possible show the different types of batteries)

Force

Force

A push or pull acting on an object is called a force.

Things do not move by themselves

Everything needs a push or a pull to make it move.

What is the main force when we are playing tug of war?

Pull

ØWhat is the main force in wrestling?

Push

·when we applied force the moving ball stopped due to the push the direction and speed of the ball changed

.

·On pressing the shape and size of the clay changed

·A bowler throws a cricket ball towards the batsman. The bats man uses force to

change the direction of the ball .Thus force can change the direction of a moving object

‘

Frictional force  is a force which is exerted when two surfaces come in contact with each other and resists the motion of the object and the object either slows down or stops moving.

It is the frictional force which  stops the cycle when you apply the brake

What happens to the ball when it is thrown up wards?

It goes up and then comes back to the ground.

ØWhen objects are thrown upwards, they came down. Why?

Due to gravity of earth.

ØWhy does a fruit from tree falls on the ground and not moves up in the air?

Due to gravity of earth, the earth exerts a force called Gravity or gravitational force that pulls everything towards it.

·Gravity acts on everything all the time. It prevents you from floating in the air. If

there was no gravity, we would be floating in the air Who are these people ?

Astronauts

·Why are they floating around and not able to stand straight like us?

·Astronauts float around in space because there is very little gravity in space

.

·The farther you get from Earth, the less the gravitational force is and astronautsare so far from the Earth that the gravity is very less and thereforein space,astronauts do not walk on the floor like people on Earth do. They float aroundinside their spacecraft,

ØWhen objects are thrown upwards, they came down. Why?

Due to gravity of earth

ØWhy does a fruit from tree falls on the ground and not moves up in the air?

Due to gravity of earth.

ØWho discovered gravity?

Isaac Newton

ØWhat is gravity?

Force that pulls objects downwards towards the centre of the Earth.

Which force was acting when Golu was playing carom with his sister and

Striking the coins with the striker?

( Frictional force)

·

What is friction?

(The friction is the force exerted by a surface as an object moves across it or makes an effort to move across it.

The force of friction allows us to push against the ground, walk, run or move forward. It is created when two objects come in contact with each other

·Friction is more on a rough surface than a smooth surface

What did you observe?

lid of the jar could not be opened with the hands with vaseline where as it opened easily with dry hands.

ØWhy did it happen so?

Because friction was less between the surface of lid and palms in case of hands with vaseline and friction was more in case of dry hands.