Archimedes’ Principle: Made EASY | Physics

Manocha Academy
25 Nov 201712:24
EducationalLearning
32 Likes 10 Comments

TLDRThe video script delves into the fascinating principle of Archimedes, which explains why objects feel lighter in water. By conducting a simple experiment with a ball and a spring balance, the video demonstrates how an object experiences an upward force when submerged in water, which is equal to the weight of the water displaced. This buoyant force, also known as up thrust, is what allows objects to float. The script further explains that this principle applies to both fully and partially submerged objects and works with any fluid, not just water. To help viewers remember, a mnemonic 'up world force' is introduced, emphasizing that the upward force equals the weight of the liquid displaced. The video concludes with a challenge to solve three related questions, encouraging engagement and further exploration of the topic.

Takeaways
  • 😀 Archimedes principle explains the concept of buoyancy, where objects experience an upward force when immersed in fluid equal to the weight of the fluid displaced.
  • 😲 The apparent weight of an object in water is less than its real weight in air due to the upward force of water.
  • 🔬 Archimedes principle applies to both fully immersed and partially immersed objects in a fluid.
  • 🌊 Buoyant force is applicable not only to water but also to any liquid or gas, making it a universal principle for fluids.
  • 🤔 The upward force experienced by an object is directly related to the weight of the fluid it displaces.
  • 💡 A mnemonic to remember Archimedes principle is 'upward force equals the weight of the liquid displaced', abbreviated as 'up world force'.
  • 📏 The formula for calculating upward force is the volume of the liquid displaced multiplied by its density and the acceleration due to gravity.
  • 📝 The key to measuring upward force is the loss in weight of the object when immersed in the fluid.
  • 👩‍🔬 Archimedes principle can be demonstrated through simple experiments using objects like balls and water in a bucket.
  • 🎥 Understanding Archimedes principle is crucial for comprehending concepts related to buoyancy, especially in swimming and floating scenarios.
Q & A

  • What is Archimedes' principle?

    -Archimedes' principle states that when a body is fully or partially immersed in a fluid, it experiences an upward buoyant force that is equal to the weight of the fluid displaced by the body.

  • Why does a body feel lighter in water than in air?

    -A body feels lighter in water because of the upward force, or buoyant force, exerted by the water which counteracts the body's weight, making it seem lighter than when it is in air.

  • What is the difference between real weight and apparent weight?

    -The real weight of an object is its weight in air, while the apparent weight is the weight of the object when it is immersed in water, which is less due to the buoyant force acting on it.

  • How can you measure the upward force experienced by an object in water?

    -The upward force, or buoyant force, can be measured by the difference between the object's real weight in air and its apparent weight in water, which is the loss in weight when the object is submerged.

  • Why does a steel ship float while a small steel coin sinks in water?

    -A steel ship floats because it displaces a volume of water whose weight is greater than the weight of the ship, due to its shape and size. A small steel coin sinks because it does not displace enough water to counteract its own weight, resulting in a net downward force.

  • What is the mnemonic provided in the video to remember Archimedes' principle?

    -The mnemonic provided is 'up world force', which stands for upward force is equal to the weight of the liquid displaced.

  • How does Archimedes' principle apply to objects partially immersed in a fluid?

    -Archimedes' principle applies to objects partially immersed in a fluid in the same way as it does to fully immersed objects. The upward force is equal to the weight of the fluid displaced by the part of the object that is submerged.

  • What is the relationship between the upward force and the volume of the liquid displaced?

    -The upward force is directly proportional to the volume of the liquid displaced. It can be represented by the formula VLDg, where V is the volume, D is the density of the liquid, and g is the acceleration due to gravity.

  • Why does the video suggest filling a hollow ball with coins for an experiment?

    -Filling a hollow ball with coins increases its weight, making it easier to observe and measure the difference in weight when the ball is submerged in water, thus demonstrating the effect of the buoyant force.

  • How does the shape of an object affect its buoyancy?

    -The shape of an object affects its buoyancy by determining how much water it can displace. Objects with shapes that allow them to displace more water relative to their weight are more likely to float.

  • What is the significance of understanding Archimedes' principle in everyday life?

    -Understanding Archimedes' principle helps explain why certain objects float or sink in liquids, which is important in various applications like ship design, understanding the behavior of materials in different mediums, and even in everyday activities like swimming.

Outlines
00:00
🏊‍♂️ Understanding Archimedes Principle

This paragraph discusses the author's experience swimming with their daughter and introduces Archimedes' principle. It explains how objects feel lighter in water due to the upward force exerted by the fluid. The author simplifies Archimedes' principle by breaking down its components and provides an experiment to demonstrate the concept. Additionally, the paragraph highlights the importance of understanding fluids and introduces a mnemonic to remember the principle.

05:01
⚖️ Exploring Upward Force and Weight in Water

In this paragraph, the author conducts an experiment to illustrate the relationship between upward force and weight in water based on Archimedes' principle. They measure the real weight of an object in air and its apparent weight when immersed in water, demonstrating the loss in weight due to the upward force of water. The paragraph also emphasizes the equivalence between the upward force and the weight of the water displaced by the object.

10:01
📏 Relating Upward Force to Volume and Density

The focus of this paragraph is to establish the relationship between upward force and the volume of liquid displaced. The author explains how upward force can be expressed as the product of volume, density, and acceleration due to gravity. They provide a formula to calculate upward force and clarify that it depends on the volume and density of the liquid displaced. Additionally, the paragraph reinforces the mnemonic introduced earlier to aid in remembering Archimedes' principle.

Mindmap
Keywords
💡Archimedes Principle
Archimedes Principle is a fundamental law in physics that describes the buoyant force exerted on a body immersed in a fluid. It states that the upward buoyant force is equal to the weight of the fluid that is displaced by the body. In the video, this principle is used to explain why objects feel lighter in water and why a steel ship can float while a small steel coin sinks, illustrating the principle with the example of a ball immersed in water.
💡Buoyant Force
Buoyant force, also known as upthrust, is the upward force that a fluid exerts on a body that is immersed in it. In the context of the video, the buoyant force is what allows objects to float and is a direct result of Archimedes Principle. The demonstration with the ball in water shows the buoyant force in action, as the ball is pushed upward by the water.
💡Displaced Fluid
When a body is immersed in a fluid, it pushes out or 'displaces' a certain volume of that fluid. The weight of this displaced fluid is equal to the buoyant force acting on the body, as per Archimedes Principle. In the video, the experiment with the ball and the beaker illustrates the concept of displaced water, which is crucial to understanding the principle.
💡Apparent Weight
Apparent weight refers to the weight of an object when it is submerged in a fluid, as opposed to its weight in air. It is the weight measured when the upward buoyant force is taken into account. In the video, the spring balance shows the ball's apparent weight in water, which is less than its real weight in air, demonstrating the effect of the buoyant force.
💡Real Weight
Real weight is the actual weight of an object measured in air, without the influence of any buoyant force. It is the weight of the object due to gravity alone. In the script, the real weight of the ball filled with coins is measured using a spring balance before it is immersed in water, providing a baseline for comparison with the apparent weight.
💡Volume
Volume is the amount of space that a substance or object occupies. In the context of Archimedes Principle, the volume of the fluid displaced by an object is directly related to the buoyant force. The video explains that the upward force is equal to the product of the displaced fluid's volume, density, and gravitational acceleration.
💡Density
Density is a measure of mass per unit of volume. It plays a key role in Archimedes Principle as the upward force a body experiences in a fluid is related to the density of the displaced fluid. The video uses the formula for upward force, which includes density (D), to show how the principle works for objects of different densities in water.
💡Mnemonic
A mnemonic is a memory aid or a device that helps in remembering complex information. In the video, a mnemonic 'up world force' is introduced to help remember Archimedes Principle, where 'up' stands for upward force and 'world' stands for the weight of the liquid displaced. This aids in memorizing the principle's formula and concept.
💡Fluid
A fluid is a substance that can flow and take the shape of its container. It includes both liquids and gases. The video emphasizes that Archimedes Principle is not only applicable to water but also to any fluid, making it a broader principle in physics for understanding buoyancy.
💡Spring Balance
A spring balance is a device used to measure weight or force by utilizing the principle of a spring that stretches or compresses under load. In the video, a spring balance is used to measure the real weight of the ball in air and its apparent weight when submerged in water, demonstrating the difference due to the buoyant force.
💡Acceleration Due to Gravity
Acceleration due to gravity (G) is the acceleration that an object experiences when it is in free fall under the influence of Earth's gravity. It is a constant used in the formula for weight and is integral to calculating the upward force on a body submerged in a fluid, as shown in the video's explanation of Archimedes Principle.
Highlights

Archimedes principle explains why objects float or sink in fluids.

Archimedes principle states that when a body is immersed in a fluid, it experiences an upward force equal to the weight of the fluid displaced.

Upward force, also known as buoyant force or upthrust, is the force exerted by a fluid on an object immersed in it.

Buoyant force causes objects to feel lighter when submerged in water compared to in air.

Archimedes principle applies to both fully and partially submerged objects in fluids.

The loss in weight of an object when submerged in water is equal to the buoyant force acting on it.

The apparent weight of an object in water is less than its actual weight in air due to the upward force of the water.

The upward force exerted by the water is equal to the weight of the water displaced by the object.

Archimedes principle works not only for water but for any fluid, including liquids and gases.

The mnemonic 'up world force' helps remember Archimedes principle: upward force equals the weight of the liquid displaced.

The formula for upward force is VLDg, where V is volume, D is density, and g is acceleration due to gravity.

Archimedes principle is essential for understanding why objects float or sink and for various applications in engineering and physics.

Understanding buoyancy is crucial for activities like swimming, where the upward force of water helps individuals float.

Archimedes principle simplifies complex concepts related to fluid mechanics and provides a practical framework for analysis.

Applying Archimedes principle can aid in designing flotation devices, ships, and other structures that interact with fluids.

Transcripts

Browse More Related Video

Fluids, Buoyancy, and Archimedes' Principle

How Archimedes Solved the Buoyant Force Puzzle 2000 Years Ago

Condition for floating | Fluids | Physics | Khan Academy

20. Fluid Dynamics and Statics and Bernoulli's Equation

8.01x - Lect 28 - Hydrostatics, Archimedes' Principle, Bernoulli's Equation

AP Physics B - 2013 #1 (Fluids - Bouyancy)

Rate This

5.0 / 5 (0 votes)

Thanks for rating:

Related Tags
Archimedes PrincipleBuoyancySwimmingScience ExperimentFluid DynamicsEducational ContentFamily ActivityPhysicsWater DisplacementUp Thrust