class 8 revision notes for the chapter 11 force and pressure
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A push or pull exerted by an object on another is a force.
Force arises due to the interaction between at least two objectsForce applied on an object in the same direction add to one another.
If the two forces act in the opposite direction on an object, the net force acting on it is the difference between the two forces.
In general, more than one force may be acting on an object at any given point. However, a force acting on an object is always the mean net force acting on it.
Force can Change the State of Motion
A change in the speed of an object or the direction of its motion or both implies a change in its state of motion.
Force acting on an object may bring a change in its state of motion or a change in its shape.
magnet can exert a force without being in contact with it. The force exerted by a magnet is an example of a non-contact force.
Contact Force: A force that can be applied only when it is in contact with an object is called a contact force. For example, hammering a nail.
Electrostatic Force: When a charged body, either having a (+) or (-) charge, exerts force on another charged or uncharged body, that force is known as electrostatic force.
Force: Simply a push or pull exerted by an object on another is a force.
Friction: The force of friction always acts on all the moving objects and its direction is always opposite to the direction of motion.
Gravitational Force: The force exerted by the earth to pull the objects towards itself is called the force of gravity.
Gravity: Every object in the universe, whether small or large, exerts a force on every other object. This force is called the force of gravity or just gravity.
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