AllRounder.ai

Enrol to start learning

Reading is open to everyone. Enrolling is free, and it is what unlocks the audio lessons, practice tests and progress tracking.

Enrol free

5. Buoyancy and Archimedes’ Principle

Buoyancy and Archimedes’ principle explain the upward force exerted by fluids on objects immersed within them, demonstrating various factors that affect this force, including the object's volume and the fluid's density. Key concepts include buoyant force, Archimedes’ principle, and density, relevant to practical applications such as shipbuilding and measurement of purity. The chapter further discusses the law of flotation, outlining how weighted bodies interact with the fluids they displace.

Sections

Buoyancy and Archimedes’ Principle

This section explains buoyancy and Archimedes' Principle, highlighting the key factors influencing buoyant force and its applications.

5 Section Overview

Start current section content and materials

5.1 Introduction

Buoyant force, or upthrust, is the upward force exerted by a fluid when an object is immersed in it.

5.2 Buoyancy

Buoyancy is the upward force a fluid exerts on an immersed object, acting opposite to gravity.

5.3 Factors Affecting Buoyant Force

Buoyant force is influenced by the volume of the object submerged, the density of the fluid, and the gravitational acceleration.

5.4 Archimedes’ Principle

Archimedes' Principle states that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced.

5.5 Experimental Verification of Archimedes’ Principle

This section outlines the procedure and apparatus required to experimentally verify Archimedes' Principle, demonstrating that the buoyant force on a submerged object equals the weight of the displaced fluid.

5.6 Applications of Archimedes’ Principle

This section discusses the various practical applications of Archimedes' Principle, emphasizing how it relates to real-world technologies and tools.

5.7 Density and Relative Density

This section introduces the concepts of density and relative density, explaining their definitions and significance in buoyancy.

5.8 Law of Floatation

The Law of Floatation states that a body floats in a fluid if its weight is equal to the weight of the fluid displaced.

Learning Objectives

  • Buoyant force acts opposite to gravity and makes objects appear lighter in water.

  • Archimedes’ principle states that a body immersed in a fluid experiences a buoyant force equal to the weight of the fluid it displaces.

  • Density is defined as mass per unit volume, and relative density indicates whether an object will float or sink in water.

Key Concepts

Buoyant Force

The upward force exerted by a fluid on an object immersed in it, counteracting gravity.

Archimedes’ Principle

A body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced.

Density

Mass per unit volume of an object, typically measured in kg/m3.

Relative Density

The ratio of a substance's density to that of water, indicating if it will float (R.D.<1) or sink (R.D.>1).

Law of Floatation

A body floats in a fluid if its weight is equal to the weight of the fluid it displaces.

Practice Exercises

Total Questions

3

Estimated Time

6 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting