FORCE AND PRESSURE

there is air all aroundn us. This envelop of air is known as the atmosphere. The atmospheric air extends up to many kilometres above the surface of the earth.

The force acting on a unit area of a surface is called pressure.pressure = force / area

Gravity is not a property of the earth alone. In fact, every object in the universe, whether small or large, exerts a force on every other object.This force is known as the gravitational force.

Objects or things fall towards the earth because it pulls them. This force is called the force of gravity, or just gravity. This is an attractive force. Theforce of gravity acts on all objects. The force of gravity acts on all of us all the time without our being aware of it. Water begins to …

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The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.

A magnet can exert a force on another magnet without being in contact with it.The force exerted by a magnet is an example of a non-contact force.

The force responsible for changing the state of motion of objects in all these examples is the force of friction. It is theforce of friction between the surface of the ball and the ground that brings the moving ball to rest. Similarly, frictionbetween water and the boat brings it to a stop once you stop …

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The application of force on an object may change its shape. Having performed all the above activities, you would have realised that a force l may make an object move from rest.l may change the speed of an object if it is moving. l may change the direction of motion of an object. l may …

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Muscular force can be applied only when it is in contact with an object, it is also called a contact force.

The force resulting due to the action of muscles is known as the muscular force.