Class 8 Science - CBSE
Exploring Forces
The chapter Exploring Forces in Class 8 CBSE Science introduces students to the fundamental concepts of pushes and pulls that cause objects to move, stop, or change shape. Students will learn about the nature of force as an interaction between two objects and explore various types of forces, divided mainly into contact forces like muscular and friction, and non-contact forces like magnetic, electrostatic, and gravitational. The chapter also covers pressure, explaining how force acting per unit area affects solids, liquids, and gases. Mastering this chapter is crucial for board exams as it forms the foundational mechanics for higher-grade physics.
Start Learning FreeKey Concepts
Force
A push or a pull acting on an object that can change its state of motion, speed, direction, or shape.
Contact Forces
Forces that act only when objects are in physical contact with each other, such as muscular force and friction.
Non-Contact Forces
Forces that can act from a distance without any direct physical contact, such as magnetic, electrostatic, and gravitational forces.
Pressure
The force acting perpendicularly on a unit area of a surface, determining how deeply an object sinks or cuts.
Atmospheric Pressure
The pressure exerted by the envelope of air surrounding the Earth, which balances the internal pressure of our bodies.
Important Formulas
Board Exam Info
In CBSE Class 8 Science exams, this chapter typically carries around 5 to 8 marks. Common question types include numerical problems on pressure, differentiating between contact and non-contact forces, giving reasons for real-life phenomena like why school bags have wide straps, and identifying forces acting on objects in specific scenarios.
Frequently Asked Questions
Why do school bags have wide straps?
Wide straps increase the surface area over which the bag's weight acts, which decreases the pressure on the shoulders.
Is gravity a contact or non-contact force?
Gravity is a non-contact force because it pulls objects toward the Earth without any physical contact.
Why does a balloon inflate when we blow air into it?
The air we blow exerts pressure in all directions inside the balloon, stretching its rubber surface.
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