Why do we weigh less in water? plus 9 more videos.. #aumsum #kids #science #education #children | Summary and Q&A

TL;DR

Learn about science concepts like Archimedes Principle, Newton's Third Law, and more in this comprehensive analysis of their applications.

Key Insights

• 💦 Archimedes Principle explains why objects weigh less in water.
• 💦 Newton's Third Law of Motion helps us understand why swimmers push water backward to move forward.
• 🫵 Convex mirrors provide a wider view of traffic when used as rear-view mirrors.
• 🥵 Woolen clothes retain more body heat due to the trapped air within them.
• 🤩 Atmospheric refraction explains why stars may appear higher than they actually are.
• 🏋️ Gravitational force determines our weight on different celestial bodies, with the moon exerting less force than the Earth.
• 🍽️ Pressure affects cutting efficiency, with a blunt knife having a larger area and producing lower pressure.
• 😘 Firemen crawl in smoke-filled rooms to breathe air below the rising smoke, which has lower density.
• 👻 Ultrasound is used in sonar due to its high frequency, which allows for greater depth penetration.

Transcript

Read and summarize the transcript of this video on Glasp Reader (beta).

Questions & Answers

Q: Why do we weigh less in water?

When we are in water, we experience an upward force called buoyant force, which cancels a portion of our weight, causing us to weigh less.

Q: Why does a swimmer push the water backward?

According to Newton's Third Law of Motion, when a swimmer pushes water backward, the water pushes the swimmer forward with an equal force, allowing them to move forward and swim.

Q: Why is a convex mirror used as a rear-view mirror?

Convex mirrors provide a wider view of vehicles behind us because they form highly diminished images, making traffic appear smaller and allowing us to see more vehicles in a small mirror.

Q: Why do woolen clothes keep us warm?

Woolen clothes contain more tiny spaces compared to cotton clothes, which trap more air. Since air is a bad conductor of heat, woolen clothes prevent our body heat from escaping, keeping us warm.

Summary & Key Takeaways

• Archimedes Principle states that an object immersed in a fluid experiences an upward force called buoyant force, which equals the weight of the fluid displaced by the object.

• Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This is why swimmers push water backward to move forward.

• Convex mirrors are used as rear-view mirrors because they provide a wider view of vehicles behind us by forming highly diminished images.

• Woolen clothes keep us warm because they trap more air compared to cotton clothes, and air is a bad conductor of heat.