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Magnifying Glass Tilted Right

Theme D - Fields

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Rocket

Theme A - Space, Time & Motion

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Thermometer

Theme B - The Particulate Nature Of Matter

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Water Wave

Theme C - Wave Behaviour 

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Microscope

Theme E - Nuclear & Quantum Physics

Ever wondered how two massive objects like Earth and the Sun interact? Let&#39;s dive into the mysterious world of extended bodies and gravitation!

<ul>
	<li>👉 Think of them as real, tangible objects like planets, moons, and even that basketball you played with yesterday!</li>
	<li>👉 Unlike pointy dots on a graph, they have size and shape. So, they&#39;re much more real!</li>
</ul>

Real-world example: Your school, your cat, and even you are all extended bodies because you have a certain shape and size.

<ul>
	<li>👉 Good news! When two extended bodies (like two planets) interact using gravity, you can think of them as tiny dots (point masses).</li>
	<li>👉 Why? If you imagine all their mass at one single point (the centre of gravity), it works out fine. BUT, this is only true if they&#39;re in a uniform gravitational field or super far away from other masses.</li>
</ul>

Real-world example: Picture two people (the extended bodies) playing catch. Instead of imagining their entire bodies, you only focus on their hands tossing the ball (point masses). Easier, right?

<ul>
	<li>👉 When gravity gets all weird and non-uniform (changes a lot), we can&#39;t use the easy &quot;point mass&quot; trick.</li>
	<li>👉 Real-world scenario: Earth&rsquo;s oceans have tides because of the Moon&#39;s gravitational pull. The Moon&#39;s gravity isn&#39;t consistent across our planet. Result? Tidal bulges! Earth spins under these bulges, causing a tide about every 12.5 hours.</li>
</ul>

<ul>
	<li>Centre of Mass: It&#39;s like the perfect balancing point of an object if you were to lay it on a pin. Doesn&#39;t care about gravity; it&#39;s all about shape and internal mass distribution.</li>
	<li>Centre of Gravity: This is where gravity seems to pull from. It&#39;s like the tug-of-war rope&#39;s middle point. But it&#39;s only the same as the centre of mass when gravity is consistent.</li>
</ul>

Fun analogy: Think of the centre of mass as where you&#39;d balance a pencil horizontally on your finger. The centre of gravity is where gravity tugs on the pencil the hardest.

Imagine a very tall, uniform box in Earth&#39;s gravitational field.

<ul>
	<li>Centre of Mass: Always chillin&#39; at the box&#39;s centre.</li>
	<li>Centre of Gravity: Starts at the centre, but moves to the lower half because Earth&#39;s gravity is stronger there.</li>
</ul>

Real-world example: A skyscraper might have its structural centre (akin to centre of mass) at its middle, but if gravity was different at the top vs the bottom, the point where gravity pulls the most (centre of gravity) might be lower!

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Remember, Kiddo: Physics isn&rsquo;t just about numbers and formulas; it&#39;s also about understanding the universe and your place in it! So, next time you&#39;re by the beach, think about the Moon and its gravitational dance with Earth. 🌊🌙

&nbsp;

Happy Learning! 🚀📚✨

Theme D - Fields

Understanding Extended Bodies & Gravitational Theory

Table of content

Quick flashback! 🚀

Extended bodies 🌠

Extended bodies & gravity 🌠

Unlock the Full Content!

Theme D - Fields

Understanding Extended Bodies & Gravitational Theory

Table of content

Quick flashback! 🚀

Extended bodies 🌠

Extended bodies & gravity 🌠

Unlock the Full Content!