Liquids At Rest


Welcome to the course on Liquids At Rest! In the realm of Physics, the study of liquids at rest encompasses a multitude of intriguing phenomena that govern the behavior of fluids when they are in a state of equilibrium. One of the fundamental aspects explored in this topic is the **determination of density** of both solids and liquids. Density, denoted by the symbol 'ρ', is a crucial property that quantifies the compactness of a substance by measuring the mass per unit volume. It serves as a pivotal parameter in various scientific calculations and plays a significant role in understanding the composition of materials. Moreover, an essential concept that will be elucidated in this course is the **definition of relative density**. Relative density, also known as specific gravity, is the ratio of the density of a substance to the density of a reference substance, often water. This comparative measure provides valuable insights into the buoyancy and behavior of objects immersed in different mediums, particularly liquids. Understanding the concept of relative density is imperative for analyzing the interactions between various materials and their environments. Furthermore, the course delves into the intriguing phenomenon of **upthrust on a body immersed in a liquid**. When a solid object is submerged in a fluid, such as water, it experiences an upward force known as upthrust or buoyant force. This phenomenon, as per Archimedes' principle, is equal to the weight of the displaced fluid and is instrumental in determining the stability and equilibrium of objects in a liquid medium. Exploring the dynamics of upthrust provides valuable insights into the behavior of submerged bodies and the principles governing their interactions with the surrounding liquid. One of the cornerstone principles that underpin the study of liquids at rest is **Archimedes' principle and the law of floatation**. This fundamental principle, attributed to the ancient Greek mathematician Archimedes, posits that a body wholly or partially submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. The law of floatation, a corollary of Archimedes' principle, elucidates the conditions under which an object will float, sink, or remain suspended in a fluid. These principles find diverse applications in everyday phenomena, such as the design of ships, submarines, and hydrometers, highlighting their practical significance in various engineering and scientific domains. As we embark on this journey through the intricacies of liquids at rest, we will explore the interplay between density, upthrust, and buoyancy, unraveling the underlying principles that govern the equilibrium and behavior of objects in fluid environments. By grasping the nuances of these concepts and their applications, you will gain a profound understanding of the captivating dynamics of fluids at rest and their pervasive influence in the realm of Physics. Get ready to delve into a world where the stillness of liquids conceals a universe of fascinating phenomena waiting to be discovered!


  1. Apply Archimedes’ Principle And Law Of Floatation To Solve Problems
  2. Determine The Upthrust On A Body Immersed In A Liquid
  3. Distinguish Between Density And Relative Density Of Substances

Lesson Note

Liquids are one of the fundamental states of matter. In this lesson, we will focus on the properties and behaviors of liquids when they are at rest. Understanding the principles governing liquids at rest is crucial for various applications in physics and engineering, ranging from designing ships to understanding natural phenomena like buoyancy.

Lesson Evaluation

Congratulations on completing the lesson on Liquids At Rest. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

  1. What is the formula for calculating the density of a substance? A. Density = Mass × Volume B. Density = Volume / Mass C. Density = Mass / Volume D. Density = Weight × Volume Answer: A. Density = Mass × Volume
  2. How is relative density defined? A. It is the density of a substance compared to the density of water B. It is the density of a substance compared to the density of air C. It is the density of a substance compared to the density of iron D. It is the density of a substance compared to the density of gold Answer: A. It is the density of a substance compared to the density of water
  3. What happens to the upthrust on a body immersed in a liquid when the volume of the body increases? A. Upthrust decreases B. Upthrust remains the same C. Upthrust increases D. Upthrust becomes zero Answer: C. Upthrust increases
  4. Which principle states that the upthrust on a body immersed in a fluid is equal to the weight of the fluid displaced by the body? A. Pascal's principle B. Bernoulli's principle C. Archimedes' principle D. Boyle's law Answer: C. Archimedes' principle
  5. How does the density of a ship compare to the density of water for it to float according to the law of floatation? A. Density of the ship is less than the density of water B. Density of the ship is equal to the density of water C. Density of the ship is greater than the density of water D. Density of the ship does not matter Answer: A. Density of the ship is less than the density of water

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Past Questions

Wondering what past questions for this topic looks like? Here are a number of questions about Liquids At Rest from previous years

Question 1 Report

The viscosity of a fluid depends on the following factors except the?

Question 1 Report

When a water droplet is placed on a freshly cut piece of wood, it spreads out to form a thin layer because the wood is

Question 1 Report

Which of the following statements about the pressure in a liquid is NOT correct? It

Practice a number of Liquids At Rest past questions