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

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·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

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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

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·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)

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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.