Force and Pressure

Science Class 8 : Chapter 11

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Quick Revision : Force and Pressure

  • Force: A push or pull on an object that can change its state of motion or shape.
  • Contact Forces: Forces that act only when objects are in contact (muscular force, friction).
  • Non-contact Forces: Forces that act without contact (magnetic force, electrostatic force, gravitational force).
  • Friction: Force that opposes relative motion between surfaces in contact.
  • Pressure: Force acting per unit area. Pressure = Force/Area.
  • Atmospheric Pressure: Pressure exerted by air around us. Increases with depth in fluids.
  • Liquid Pressure: Liquids exert pressure on container walls; pressure increases with depth.
  • Gravitational Force: Attractive force between objects; Earth's gravity pulls objects downward.

Questions

Chapter Summary : Force and Pressure

What You Will Learn: This chapter covers different types of forces (contact and non-contact), effects of force on objects, friction, pressure, atmospheric pressure, and pressure in fluids. It explains practical applications like why sharp knives cut better, why porters use cloth on head, and how atmospheric pressure works.

How This Website Helps: Provides graded MCQs from basic to advanced levels with detailed explanations to strengthen conceptual understanding and prepare for exams.

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