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# ICSE Class 8 Physics Chapter 3 Force and Pressure Revision Notes

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## ICSE Class 8 Revision Notes for Physics Chapter 3: Force and Pressure

ICSE Class 8 Revision Notes for Physics Chapter 3 Force and Pressure can be very helpful for students to recall all their previously learned chapters and concepts quickly and conveniently, especially during exam when they have to revise the whole syllabus in a limited time period. Revision Notes for Physics Chapter 3 makes it convenient for the students to have an overview of the important concepts and points of ICSE Class 8 Physics Chapter 3 and hence, enhances the confidence among them.

ICSE Class 8 Revision Notes for Physics Chapter 3 Force and Pressure by Swiflearn are so far the best and most reliable Physics Chapter 3 Revision Notes for ICSE Class 8. These ICSE Revision Notes for Class 8 are prepared by subject matter experts at Swiflearn to help the students to understand and revise the concepts right from the beginning. ## ICSE Class 8 Revision Notes for Physics Chapter 3: Force and Pressure

Force:-

A push or a pull on an object is called force. Force has both magnitude and direction. The SI unit of force is newton. The motion imparted to objects is due to the action of a force.

Forces are due to an Interaction:-

At least two objects must interact for a force to come into play. Thus, an interaction of one object with another object results in a force between the two objects. More than one force may act on an object.

Exploring Forces:-

A force can change the state of motion of an object, i.e. a force can make a stationary body move; it can stop a moving body; it can change the speed of the moving body. If two bodies exert force in the same direction and to the same object then the net force acting on the object is the sum of both the forces exerted by the bodies. If two bodies exert force on an object from opposite directions then the net force acting on the body will be the difference of the two forces and towards the direction of the larger force.

Pressure:-
Pressure is defined as the perpendicular force acting per unit area. It can be represented as, pressure = force/area on which it acts.

Pressure exerted by liquids and gases:-
Anything occupying space and has mass exert pressure. Therefore, it is true that liquids and gases exert pressure. Liquids and gases exert pressure on the walls of the container. The pressure exerted by water at the bottom of the container depends on the height of its column. Liquids exert equal pressure at the same depth. 