Physics Riddles that will Keep You Awake at Night 

Great video, loved the animation. This video test our intuition and knowledge about the frame of reference concept in physics. I have the same answer for all puzzles. Lots of other comments mention air resistance, but it will heavily complicate the problems. Maybe because in the example the train and falcon moving very fast 300 km/h, so our intuition tells us we can't neglect air resistance. I think it will be easier to imagine these puzzles at a slower speed 50km/h, train window always open and the bird just glides not clapping its wings. For puzzle four, it is very obvious the answer is (a), but random thought option (c) if you are a superhuman and can jump fast enough to escape earth gravity, we will reach an infinite height and no longer be within the same frame with earth. Anyway nice video, keep it up!

i feel like c is correct in puzzle 4. the higher u jump (the further u get away from the center of rotation), the more the distance increases u have to travel in order to stay exactly above the jumping off point. and because ( i presume) your absolute velocity stays the same, since you do not accelerate yourself while in mid air, you must land further from the jumping off point, the higher you jumped.

I still think the falcon would be moving slightly forward because once it’s inside the train it would have less air resistance so it would be exerting same amount of force to propel itself but with less resistance. Though this might be over analyzing.

Finally, a clear answer and explanation to my question when I was a kid. "What will happen if I toss a coin inside a fast movie car". Thank you Beyond Ideas!

I disagree with the answers to questions one and two. When entering the train the falcon would no longer be subject to air resistance created by travelling at 300kph and be back at 0 kph. It would therefore quickly move forward. Theoretically, if the cabin was long enough it could fly forward within the train and reach a speed of 300 kph which relative to outside of the train would be 600 kph. It would be like firing a gun in the train. The falcon would drop straight on to the meat as travelling in the same reference. It’s like if the boy held up a marble and dropped it on to the floor in the cabin. The marble is not going to get flung into the back of the train but land underneath where the boy dropped it. If this was not true imagine how dangerous dropping cutlery on an airplane would be!

Puzzle 4 was my first job's final round's interview question. Glad that was in Physics and I cracked it with ease because of my love with Physics. It's good to see that I still follow Physics in some manner and feel nostalgic with Puzzle 4.

I contradict with you in the first puzzle as the correct answer should be B . As the falcon flys with the help of air so as soon as it enters the train it would start moving forward inside the train ( assuming that the train is a bulllet train and has closed windows but only by chance only one window is open somehow ) because the air is staitionary in reference to the train . But if you change the puzzle a bit like if the train is travelling on moon with vaccum in both outside and inside and that their is a small rocket which is flying the same speed as train and it gets inside it then the correct answer is A . I hope that you will look into it .

It's exactly like Whatif channel does. But it isn't. It's a masterpiece.

Got itt

I like how in the end you show your behind the scenes/editing part. That is a reference to you getting out of your comfort zone. Perfect example of what you described at the end.

Training brain in the morning 🧠⚡️

I know it's just a simplification but there would be a thick wall (and a vortex) of air at a presumably open window. It would either bounce off that turbulence or it gets stripped of his feathers if it enters the wrong area at the wrong time. (Unless those 300 "units" per hour mentioned at the start is safeguarding against this exact counterargument by having it equal 16mph or some other benign speed.) Ye I'm a bit of a stickler when it comes to thought-experiments as it's hard to draw a line at what "counts" and what's "acceptably fake" while explaining them.

Beautiful ending!

i feel like this is wrong, when the falcon is moving with 300 units/h it has alot of drag and needs alot of power to maintain that speed. once it moves into the train all drag is removed and he can stop poviding that power to just slowely drop to the floor, there is no more drag that slows him down compared to the train because once he enters the plain all drag is removed. now if he keeps on flying, slowely going back up to 300 units. his 300 units will add on to the 300 units of the train making up a total of 600. my awnser would be A-C-B-C. just watch some of those skydiving video's of redbull where they put on a wingsout and dive off a mountain into a moving plane. the plane is moving at x units and the skydiver at the same x units. When the skydiver enters the plane he can just aim up (vertically) and normally (outside the plane) that would mean he would drasticly slow down his speed because he would introduce alot of drag. but because there is no more drag of the wind inside of the airplane, so when he aims up he can just stand up instead of smacking to the back of the airplane at a very high speed. Correct me if i am wrong. but i feel like you made a misstake at question 2

Yeah !!!!

Got all correct😎

Isn't the airspeed inside the train moving at 300 k/h relative to the airspeed outside the train?

Great video. I failed badly! Love and peace. Tim

Ending massage of this video very nice

Sir, Yes you, Your channel is very underrated.

Another masterpiece by beeyond ideas 😌👌

thank you for this video. helped me rediscover my love for physics!

You could also push yourself and the future generations to go greener and be less wasteful or you'll just try invading Uranus after you've used up Mars.

What would happen if the falcon was inside the train from the beginning and started flying in the air while the train was already 300km/h? Would he still land in the same place or the objects moving in the air are gonna be pushed backwards just because they spent longer time in the air rather than jumping person inside the train?

I got 3 out of 4, this was definitely fun! I am looking forward to seeing future videos like these!!

man i just fall in love with this channel ...

Please make more of these riddles !! Glad i found out your channel !

Op as always :')

Let me see a show of hands, who here got all the answers correct? 😎

I got all answers right, easy peesy for neet aspirants. Next time come back with tougher questions

These are absolutely amazing!! Shared them with a bunch of my friends to do. Please make more of these physic exercises that are real world related but actually make you think.

your videos are so creative and awesome.. great content I love this

Love this video! Exercising critical thinking is sooooo important!

Wouldn't the coriolis effect have some influence on where you land when jumping ? Therefore landing very slightly off?

Happy New Year! Interesting video as always! I have always thought about this but I couldn't really get my head around it. Does the same logic applies if instead of a falcon, it was a balloon? What is the behaviour of the balloon? Will it stay afloat or get 'pushed back' to the rear of the train? I'm assuming it will end up at the rear of the train, because it has zero velocity?

Bro these were not even puzzles , as a high school physics student I can conform that a 12 yr old can solve without Difficulty .

You guys make such great videos but don't know why so few and far in between!! One way to drive reach especially when a channel is confident of producing great content is to keep them churning at the regular frequency. Hope this channel does well!!

I got ABBC

Nice video! Keep it up. I like that you bring up classical physics puzzles in the time where everyone else is trying to cover material too advanced for us noobs :P I'd like to comment on the "one frame of reference" bit since it is ambiguous to me. I'd rather say the train velocity is carried over to the boy instead.

Nice video!

If the Falcon flying comes to rest after getting into the train,it would be of the same reference to the train then it can pick the meat directly from its position right?

whats the difference in dropping a ball and the bird cutting its momentum in the train? isnt the air also moving at the same speed? once the bird entered the train and interacts with the air moving at a different speed its frame changes as well...

I disagree with the first problem. When the falcon and train move at the same speed which is 300km/h they both are facing the same air resistance, but when the falcon gets inside the train, other physical factors jump to play, for example ( different pressure and slight wind resistance if a window is still open).

Amazing video and Bro can u do a video about expansion of universe.

I'd like to be corrected as to why the answers to the first two riddles aren't B and C. I assume the air in the train is moving with it, i.e. it is stationary relative to the train. In that case, the falcon's velocity relative to the train and the air inside is 0. Outside the train, the air is moving backward relative to the falcon, but when the falcon enters the train, the air stops for it. What was its outside air and ground now becomes the train's air and the train's floor. That's why I think the falcon should be able to accelerate, as its velocity relative to the train and the air is 0. Hence, B. Following the same logic, the answer to riddle 2 should be C.

The falcon shoukd just land where it can and walk to the meat normally with the train being it’s reference.

Hello my friend I am a pretty new subscriber and was thinking or have been for quite some time actually that I wish that I had someone who is A.smarter and better educated than myself and B.has some what an expertise in physics in general orat least a better grasp of it all than I myself do which isn't saying much lol anyway I just wanted to know if u would mind explaining or rather confirming weather or not another of my subscribed channel'sAnd science buff overall as am I myself only I'm not smart enough to wrap my head around alot of the things my other subscriber talks about but mainly have been curious as to if this person's theoretical artificial gravity setup would actually work I the way he claims that it would again theoretically of course I just would like a person more capable of understanding physics than myself to explain weather or not his idea would actually work in the real world as he claims it in fact would work and work well though it sounds quite simple yet plausible I wonder if it could or would in fact work please could u check into thisif u can find a min

What if the bird started off standing inside the carriage from 0 to 300 then started to fly inside the carriage.. Would it be going 600 units in total.. Vs if the bird flew into the carriage already at 300. What if it flew in at 300, the. Landed, then took off again... So many questions

Puzzle 1: Answer A ? Puzzle 2 : Answer B? Puzzle 3: Answer B? Puzzle 4 : B?

puzzle 1 A

the bird would have to fly at the exact same speed as the train to hover over the point of landing and then slowly descent down to land.

A.C.B

The 4th question is wrong, you are confusing angular velocity with linear velocity. Yes, your linear velocity will stay unchanged as long as an external force has not been acted upon. But this, in contrary to what you believe disproves your point instead of proving it. See, the correlation between angular velocity and linear velocity is: w.r=v As your linear velocity has to stay the same, when you jump, thus increasing the radius beeing the distance between the center of the world and you, your angular velocity has to decrease to equalize. As where you fall back in earth is dependent on the angular velocity instead of the linear velocity, you will fall behind. What you say totally contradicts Physics, as for it to be true we need to ignore Newtonian principle inertia. The force thats aplied to you when you jump is perpendicular to your linear motion, therefore it must not make you gain any linear velocity, concluding in you falling back, from the earths angular velocity beeing greater than yours. Hope l could make myself clear and help you or any others with confusion, l would like to discuss anything you oppose or are confused about. With due respect.

What happens if we try to fly a drone from inside of the train ...??

Falcon will be moving forward w.r.t to the kid because w.r.t train the kid is at rest and the falcon is moving

Suppose train doesn't roof and someone jump more than 10ft what will happen.will it Fall backward if so,why it's happing.

🙋🏻‍♂️

The falcon does not become part of the reference frame by touching the floor of the train, but by entering it. There is air in the train (hopefully). If the falcon would be flung back to the end of the train, then the kid would experience the same while jumping. Which is not the case. As one other comment mentioned, it would also be the case that the falcon flies forward inside the train upon entering it. That is because the air inside moves with the train, and therefore the wind resistance the falcon has experienced outside ceases. The imagery also causes confusion, because the falcon must fly upward inside the train, not forward to keep itself in the air.

There is no way this is right. Change the reference frame and imagine the train is sitting still and a wind is blowing at 300 units per hour along the train. The bird is fighting against the wind to enter the safety of the train. You are basically saying that in this instance if the bird stops flapping it will inexplicably be slammed against the back wall once it enters the train. There is no force to cause such a change in motion

After the falcon enters into the train it also becomes a part of that single reference . When it was outside, it required lot of energy to fly at that high speed. When it was inside , did it require the same energy to fly or felt the same exhaustation as before ?

Acceleration is zero thats why kid will be returne to its own place without deviation

Hey brother make more videos like this

idk how i got all of these correct

Lol people are getting too serious, but this is a simple basic theory to enjoy even for non scientific person like me. This is real fun to watch tho! 😆😆😆😆😆😆

Independent Answers for Puzzles: P1 {B} P2 {C} P3 {B} P4 {A} Results: 1 {Wrong} 2 {Wrong} 3 {Correct} 4 {Correct} Real Answers: {A B B A}

So on that basis . If a bee was on the train. It would be flying at 300kmh .. I didn't know bees could fly that fast

Please consider my appeal. The first puzzle is not as simple as you said , probably! I think the answer is "the Falcon appears to be moving backwards". I can give you a logical illustration of that. If the Falcon wants to enter into the train it must have two velocities: 1)along the direction of the train 2)towards the window The resultant velocity is diagonally towards train and is 300 units per hour. If this resultant velocity is 300 units per hour then it's one of the component velocity along train must be less than 300 units per hour..... So now at the moment it enters into the train it appears to be moving backwards to the boy inside.

The bird will after entering the train BE in the same frame of reference. And pick up speed smacking into the front window of the train. This because the air inside the train wich is in the same reference as the train would all of a sudden not put any resistance on the bird. Allowing it to go faster. Also since the bird IS in the same frame of reference as the train it would drop straight down if it was stationary and suddenly stopped flapping its wings.

I'm not sure about Puzzle 1. If Falcon goes inside the train he will fly forward relative to observer in train. Outside he flying 300u/h in air, because airflow under wings=uplift. When he flies into train, there is no airflow as outside, because the train is like moving tank with stationary air. Then he will fly in speed of 600u/h relative to outside observer.

In the first puzzle , the air inside the train is also moving with 300units/hr so after entering the train , the falcon will appear to go forward..

Can you please tell us about your educational background!....?

I have one question If a helicopter is flying at height 1km above the ground, but it's velocity is zero, after five or six hours will it be at same point or due to motion of earth it will pass the point?...

i am highly sure that the first one is that the falcon would fly forward, because the air is not on the same frame of reference as the train. So when the falcon enters the train, the air is not moving relative to the falcon, giving it more speed.

1,3and 4th answers were correct But I failed to understand the 2nd question Nice one though, make more of these

I guess you missed it all up with the falcon inside a train. In fact the air inside the train through which the falcon is flapping its wings is also moving at 300 unites/hour. so once insides this closed echo system, the bird would be moving at 600 units/hour. the only factor that would make your deduction right is when the same scenario repeated in a train without roof.

Puzzle1- (A)- velocity component parallel to train of falcon would be less than 300. So, it will look like flying backward. Puzzle2- (C)- According to Newton's first law, zero external force in the horizontal direction, velocity of falcon in the train direction will not change. On the other hand gravity will pull the falcon towards the floor. So the trajectory would be parabola. One of the possible answer is C only when falcon is intialy flying at a particular height fron the floor which we can easily calculate using Newton's laws. Puzzle3- (B) same reason Puzzle4- (C) Coriolisis force.

The bird would have great difficulty even flying into the moving train because the air in the train is moving with the train and the air outside is moving past the bird. I think the bird would disintegrate.

Falcon is part of the train the moment it enters the air contained in the train.

so when there’s a fly in my car and i’m driving 70 units per hour, the fly has to also be flying 70 units per hour or it will splat the back windshield of said car? somehow i’m skeptical of this logic

As soon as the falcon enters the train, it will move forward. The same as if a falcon perched on a seat in the back of a car decides to fly to the front of the car. The falcon cannot remain stationary once inside the car.

Answers 1 and 2 are wrong. There's no way the falcon will remain stationary if it remains applying the same force forward inside the train, given that the air inside the train is now moving at the same speed of the train relative to the ground. Meaning the air inside the train is stationary relative to the train, so the falcon will gain forward speed relative to the train and it will land on the meat once it stops moving it's wings.

OK this actually threw me! Using a bird in flight is a little unfair, as soon as it enters the train where the air inside is moving relative to the train, it would accelerate up to 300 units/h from the new 0 units/h reference. Unless it stopped flapping its wings and landed, right? Oh my head hurts!

You said no Relativity. But these are all about Relativity 😢 😭

Bro this is so wrong lol. Once the bird is in the train, he would be going 600 units/hr relative to the earth and 300 units/hr relative to the train. If he was going max speed in the train, he would splatter himself on the door the next car lol

I disagree with the first two answers. It seems to disregard the fact that the air inside the train car is moving at 300 units forward. Wouldn't the air transfer it's momentum?

Wouldn’t there be wayyyy less air resistance in the train? Making the bird fly forward?

Wouldn’t the air in the train be moving at 300 km/h? Therefore the falcon would be propelling itself inside the train at its ability to fly 300 km/h. So the falcon would fly 600 km/h inside the train relative to earth. If the train didn’t have a windshield or roof etc you would experience the air the way the falcon did outside the train and the falcon would fly stagnant next to you.

I don't think this is right.. assuming the train has windows. There is a difference in a car if you sick your hand out the window... or roll up the window and put your hand up. Falcons need to move air over their wings to create lift. I don't think a falcon can hover in one spot. Maybe I'm just over thinking it as a Pilot.. Even if the train didn't have glass windows, there would be all sorta vortexes and currents caused by the shape of the window frame.

all wrong. train and air are one system of reference in the train. once the falcon enters he becomes part of that reference frame. should he continue flying he would fly fast THRU the train. This is not vacuum!

But what about the massive reduction in wind resistance when the falcon enters the train?

Hate captions. I can turn them on myself if wanted and needed

Answers are incorrect. Your example would be better if the observer, bird, and meat were on top of the train. Also, the last riddle is neglecting Coriolis force and the Eötvös effect.

I'm not sure answer is right. Falcon going back when landing on meat. Why?

With all due respect, your answers / explanations to these riddles calls into question the validity of everything you say in all of your videos. Your production value is high, but your understanding of some physics concepts is very wrong. You should do yourself a favor and pull down this video.

Nice try, your missing some very important details.

Ah this is wrong lol… poor ppl in the comments.

This video is wrong wrong wrong

Honestly dude, this can be very misinforming and you need more input of data to explain these problems properly

This video is horrible, what about particle Collison, wings flapping, aerodynamics, drag coefficient, gravity, etc, the equation is too simple to involve complex characters like a train or a bird

Why on earth I want a falcon inside the cabin. How lame is this bro !?