Class 8 Science - ODISHA
Exploring Forces
The chapter Exploring Forces in Class 8 Science under the Odisha BSE curriculum introduces students to the fundamental concepts of pushes and pulls that cause objects to move, stop, or change shape. Students will explore contact forces like muscular and frictional forces, and non-contact forces such as magnetic, electrostatic, and gravitational forces. Understanding this chapter is crucial for building a strong foundation in physics, as it explains everyday phenomena like why a ball stops rolling or why an apple falls to the ground. For board and school exams, questions from this topic frequently appear as conceptual definitions, numericals on pressure, and differentiating between force types.
Start Learning FreeKey Concepts
Force
A push or a pull applied on an object that can change its state of motion, speed, 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 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 weight of air in the atmosphere surrounding the Earth.
Important Formulas
Board Exam Info
This chapter typically carries around 5 to 8 marks in the Odisha (BSE) Class 8 science examinations. Common question types include short-answer questions differentiating contact and non-contact forces, numerical problems based on the pressure formula, and giving reasons for daily life observations like why school bags have wide straps.
Frequently Asked Questions
What is the difference between contact and non-contact forces?
Contact forces require physical touch between two objects to act (like lifting a book), whereas non-contact forces can exert a pull or push from a distance without touching (like a magnet attracting iron).
Why do school bags have wide straps?
Wide straps increase the surface area over which the bag's weight acts. Since pressure is inversely proportional to area, a larger area reduces the pressure on the student's shoulders.
Does liquid exert pressure?
Yes, liquids exert pressure on the walls of their container and at the bottom, and this pressure increases with depth.
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