r/oddlysatisfying • u/therra123 • 3d ago
Newton's first law of motion demonstrated with dirt on a tennis racket
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u/therra123 3d ago
Newton’s first law of motion states that objects will remain at rest or keep moving in a straight line at a constant speed unless an external force acts upon them
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u/Jew-fro-Jon 2d ago
I keep forgetting which one that is (I am a physics researcher). The 2nd is the equation one, the 3rd is the one that you can’t prove and is sorta profound. The 1st law I remember as “the obvious one”, but I never remember what’s obvious about it.
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u/Lou_C_Fer 1d ago
If you're serious. Take a few minutes and really commit it to memory. I find myself not being able to remember things that I've subconsciously labeled as unimportant or beneath me. Hell, I did it once with using my calculator for a statistics class. Exams were a real treat just mashing buttons until I get the right settings.
I have no other excuse. When I want to remember something, I remember it.
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u/McEnding98 3d ago
Also the third law, which is the reason the racket moves down in the first place.
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u/sirbeasty3 2d ago
Wouldnt the 3rd law be better fit to explain why the ball bounces up, than the racquet going down
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u/McEnding98 2d ago
The ball bouncing up has to do with elasticity. If it wasn't elastic at all it would lamd on the racket like a bag of sand, which would still push it down, but make it less visible.
In practice, of course the other component of the third law is the ball flying up, yeah, totally agree in this case.0
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u/ChefArtorias 3d ago
I was focused on the dirt turd and wasn't expecting the entire racket shape of dirt to be hovering. Surprisingly fun watch.
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u/TheTrackGoose 2d ago
All 3 of his laws at work.
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u/TheTrackGoose 2d ago
Object at rest staying at rest until acted upon by an outside force. Object in motion staying in motion until interfered by an external factor. Action having an equal and opposite reaction.
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u/McEnding98 2d ago
You only mention the first and third law here, the second law was proportionality between acceleration and mass, which is more explaining why the racket moves a lot less quickly than the ball.
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u/_JonSnow_ 1d ago
Can you explain that last part? “The racket moves a lot less quickly than the ball”
You’re saying the racket, having more mass than the ball, accelerates slower than the ball?
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u/McEnding98 1d ago
Yes the second law states that F=m*a. The force on the racket and the ball is the same(not perfectly, having a hand hold it skews this), so for a big m like the racket, acceleration needs to be small. And for a small m like the ball, the acceleration needs to be big.
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u/Cosmic_Confluence 2d ago
*clay
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u/Gold_Ad_8254 2d ago
Bro clay is a subset of dirt
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u/thatbrazilianguy 1d ago
It’s more like ground bricks.
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u/Gold_Ad_8254 1d ago
clay is a type of dirt bro
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u/thatbrazilianguy 1d ago
Clay courts come in the more common red clay (known in France as terre battue), which is actually crushed brick, and the slightly harder green clay, which is actually crushed metabasalt.
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u/Gold_Ad_8254 1d ago
My bad, clay is a type of soil not dirt anyways
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u/thatbrazilianguy 1d ago
Almost all red clay courts are now made not of natural clay but of crushed brick that is packed to make the court, with the top most layers consisting of finely crushed loose particles.
Clay used in tennis courts is not soil. It’s crushed bricks. You’re confusing it with natural clay, which is completely different.
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u/Invested_Glory 2d ago
I would argue that 2nd law is *more* on display here--inertia. Much like how a balloon filled with helium in car will "move" towards the front of the car when the driver starts to drive (and "moves" to the back of the car if driver slams on their brakes).
Overall, all 3 laws are in use here as they should. The 3 go hand in hand to explain the phenomena and build off each other rather than being observed separately.
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u/Dwarf_Killer 2d ago
Mfs out here see a video of anything and must relate to back to physics law for no reason.
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u/ThinNeighborhood2276 3d ago
That's a great example of inertia in action! The dirt stays in place until an external force (the racket's movement) acts on it.
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u/SugarFrostBloom 3d ago
The racket moved but the dirt said "I'm good right here thanks."