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

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September 20, 2017
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Why do we weigh less in water? plus 9 more videos.. #aumsum #kids #science #education #children

## 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

Topic: Archimedes Principle. Why do we weigh less in water? Hey. Looks like you have gained a lot of weight. Come on. Let us check your weight. You weigh 132 pounds. Alright. Don't get stressed. Check your weight in water. Look. It is much lesser. Do you know why you weighed less in water? The answer to this is based on Archimedes Principle. Not th... Read More

### 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.