Class 8 Science - HARYANA
Exploring Forces
The chapter Exploring Forces in Class 8 Science introduces Haryana Board (BSEH) students to the fundamental concepts of pushes and pulls that cause objects to move, stop, or change shape. Students will learn about muscular, friction, magnetic, electrostatic, and gravitational forces, dividing them into contact and non-contact categories. The chapter also covers the concept of pressure as force per unit area, explaining how atmospheric pressure works in daily life. This is a high-scoring chapter for BSEH final exams, frequently featuring numerical problems on pressure and conceptual questions about friction and force types, making a clear understanding essential for good grades.
Start Learning FreeKey Concepts
Force
A push or a pull acting on an object, which can change its state of motion, speed, or direction, and even its 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 exert an effect from a distance without any physical contact, including magnetic, electrostatic, and gravitational forces.
Pressure
The force acting per unit area of a surface. Higher area means lesser pressure for the same force, and vice versa.
Atmospheric Pressure
The pressure exerted by the envelope of air surrounding the earth, which surrounds us completely.
Important Formulas
Board Exam Info
In the Haryana Board (BSEH) Class 8 Science exam, this chapter typically carries around 4 to 6 marks. Common question types include defining contact and non-contact forces, giving daily life examples of friction or atmospheric pressure, and simple numerical problems calculating pressure when force and area are given.
Frequently Asked Questions
What is the difference between contact and non-contact forces?
Contact forces require physical touching between objects (like muscular force), whereas non-contact forces act from a distance without touching (like gravity and magnetism).
Why do school bags have wide straps?
Wide straps increase the surface area over which the bag's weight acts, which reduces the pressure on the student's shoulders.
Why do we not get crushed under atmospheric pressure?
The fluid pressure inside our bodies is equal to and acts outward against the atmospheric pressure, balancing it out completely.
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