Relative Motion and Inertial Reference Frames
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- Опубликовано: 9 фев 2017
- Did you know that everything is moving? Even you, as you're sitting perfectly still, because the earth is moving, and the sun, and the galaxy, and so forth. For this reason, it only makes sense to talk about the motion of some object relative to some other object, just as Galileo told us. Watch this and see what I mean!
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Thank you for speaking slowly and clearly unlike others in the profession of RUclips science presenters who seem to speak at the speed of light.
😂 very well said...especially considering the topic.
😅😅true
Speed of light 😂
lol
Well, that's all relative! Kidding.
WOW!! This guy is very good.. I been struggling with this for days, reading a lot and getting more confused. He made it simple to understand. Why cant more teachers do this???
Please explain me
there's no way you did your assigned reading.
if you really did your assigned reading and you're still confused then science is not for you.
u235u235u235 some people are visual learners uknow
@@u235u235u235 wow what a stubborn view, you are more deserving of being told that science is not for you.
@@Freyia935 ?
Those great animations must have taken a lot of time to animate. Great job.
they take forever! but it's worth it :)
Not good
@@ProfessorDaveExplains Hi Dave. May I use this as supplementary source in my physics class? While explaining the reference frame the animations that you prepared will make it much more clear for the students. Dr. Serkan Sancak (Ph.D. Physical Oceanography).
yeah like just to show it to your students? of course!
@@ProfessorDaveExplains Sure, if we have time I'll play it in the class or just share the link of your video. I was already mentioning your channel within the "content approved" sources. Generally I don't trust youtube contents easily, some are full of mistakes. Keep up the good work! And thank you very much.
I'm a high school student and I came to this video because pf my Physics teacher. He already mentioned the video was great but I didn't imagine it that GREAT. Professor Dave, you have a new great fan! You actually have solved all my doubts I had with this term. THANKS!!!!!!
DUDE THIS WAS THE MOST SIMPLEST EXPLANATION ever, many thanks!!!!
Simple, straight forward and with illustrations that make sense. Excellent video. Thanks.
Prof.Dave yo rock
Remember, you could be the best teacher the humanity has ever seen ...
Cause ya shrunk a hour class into 6 mins and still it is well understandable
When we stand still relative to the object, we are taking it's reference frame. Inertial reference frames are the frames that does not accelerate relative to other inertial frames.
An easy way of testing inertial frames: take any object and release it in mid-air. If the object stands still, your frame is inertial.
Beautiful, easy to understand, and efficient explanation! I also appreciate your enunciation. You are incredible! Thank you for creating such phenomenal educational content! 💓💓
I love the way the car just honks at you cuz you're explaining physics in the middle of the road
This was really confusing in the textbook, but this video made it infinitely easier to understand, thanks
Visualizations are very important in learning. Thank you for the animations - they drilled the concepts home.
GOSH, I've never seen anyone explained the concept so clearly.. Concepts puzzled me for years finally gotten solved! Thank you so much.
Thank u, it's been days I have been watching one video over other, this resolves my problems
I would recommend those who are only being introduced to this concept to take a look at the amazing properties of Einstein's Relativity. Great videos! Love your channel!
Woooh bro people are seeing this to learn about relative "motion"(as in just mechanics) not time dilation,space time etc
None of the explanations in my native language helped me understand the topic and this video did help me. Thanks, Professor Dave.
Really appreciate how you put in so much effort in the animations to make stuff way easier for us 🥰
Holy crap never have I understood inertial reference frames as I do now. Thanks a lot for this! Every explanation of inertial reference frames I saw were so complicated and confusing to understand.
Wow, this is well made. Good job, Professor Dave.
I read few Physics books to understand this and you explains this so well ! Thank you !!
Great explanaition; you make things look much simpler!
Fantastic, thank you! I was struggling to understand the textbook's explanation of an inertial frame, and you described it perfectly! :)
It's an unaccelerated frame, one attached to something that's not feeling a force and thus accelerating by F = ma. The word frame means there's a coordinate system used to specify locations within the frame. Maybe the Earth's frame has coordinate x,y,z = 0,0,0 at Earth center of if you like 0,0,0 is where you are standing on the surface.
"The Milky Way galaxy is moving through the universe at 230 km/sec" Relative to what?
just other galaxies, i believe.
that means its velocity is different with something we kept as stationary there
But they also move... How to know the absolute velocity in space/everything/existence?
Do we know if the space/background is not affected by the gravity of just us, or something much bigger that could be pulling us too?
""The Milky Way galaxy is moving through the universe at 230 km/sec" Relative to what?"
All galaxies are moving away from the center of our universe, so the velocity pf 230km/s would be relative to the center of the universe.
I FINALLY UNDERSTAND THIS THANK YOU SO MUCH IT'S BEEN YEARS
this video was so so helpful! you make learning the topic easier cause you speak slowly, have colorful pictures/animations to illustrate your explanations, and emphasize definitions. thank you for packing my 2 hour physics lecture into 6 minutes!
Thank you very much, my "PHD" professor briefly covered inertial frames but this video was able to make up for her incompetence!
Another way I like to think of it is that when you are on a train and are moving away from the platform, it looks like the platform is moving and the train is staying still, so the train and the platform are both the inertial reference frame.
This video was awesome, I'm literally doing a project on relative motion thanks to this. Can anyone link a simulator that shows the data for the throwing the ball example?
You nailed it Professor Dave..loved it.
thanks prof dave. it helps me a lot. looking forward for more video tutorials.
Can you please explain in details how a fly soar around very casually inside a car that is going around let's say 120 km/hr.? I mean the flies don't go up and down like the ball you showed here in animation, they are going all the ways and up and down and right and left? It will be much helpful.
3:36 the ball does have the horizontal velocity of the train... The important point is you do too... So with respect to you... The ball remains at rest.. correct me if I am wrong..BTW you help us a lot man!🥂
Explained so well!
Thank you for this video.
Keep uploading such videos
Dear man I appreciate your work, I would love if you would make a video about energy in reference systems
What would the free body diagram of the ball look like when it is in the air (when thinking about the example with the train)? Is there a horizontal force that acts on the ball in the direction that the train is also moving?
Such a good explanation! Your animations are so easy to understand. Thank you❤
This is way better than Crash Course or Khan Acadamy!! Thank you so much!
thanks for the kind words! i aim to please :)
exactly
@J lol I think this guy is like a science teacher for retards, khan academy is way better but if your slow in the brain you might not be able to follow along, this guy might suit you better in that case
Because Khan Acadamy is wrong. He should go back to academy. Kahn is giving misleading information and incorrect.
i think khan academy and this video are both very helpful in different ways.
It's really a good one , specially the animations were more relative to the frame of understanding 👍
the best explanation yet. thank you!
This was the best explanation for this phenomenon! Thank you
I appreciate your explanation. I learned a lot today.
Much much better than any of the other videos😘😘
You explain better in 6 minutes than a book does in 1 week
simple yet understandable explaination for a very complicated topic.....thank you
Solid explanation! Thank you
4:35 what if the ship is moving with an acceleration?
Videos like this deserve a love button. Like just doesn't express the gratitude.
Random question but how can we calculate the displacement of a ball thrown up in the air and back down with the inertial reference frame being the universe? So like taking into account the rotation of the earth, galaxy, etc. And what about the speed of the ball?
Your explanations and diagrams of basic concepts in physics are wonderful. I have used them to teach my children.
Thank you Professor Dave!
just wondering, I have been told that the speed of light is absolute, but relative to what? it doesnt speed up if the light is coming out of a headlamp of a moving vehicle, but what is that relative to. If the speed of light is absolute, then could it be at a different speed in a galaxy that is moving at a different speed relative to us?
Thanks for this! Great content!
Thanks so much for the super good explanation!
I literally just now understood how time is relative in spacetime and how events can be perceived differently by different observers in that context. thank you
Daora parça, fortaleceu aqui nos estudos💪
Thanks!
you are simply amazing ..... was tired and confused after watching so many contents....but you made it all easy ..... love from india **** sir
Excellent explanation! My book was not very helpful for this section and basically just gave me an equation without going into almost any detail.
This was so helpful
his intro is probably the best intro I've ever seen
If we both move opposite direction in exact velocity?
Then how I will feel relative to my train as reference point?
Excellent explaination 🙌
Hi professor ,I have one doubt the Earth moves faster nearer to the sun and moves slower farther to the sun the velocity is not constant it is varying between some values so from your point of view Earth is an inertial frame of reference but the condition for inertial frame of reference it obeys Newton's I law (constant velocity) . please explain?.I am confused.
good question! we approximate earth as being an inertial frame of reference, but you're right, in the strictest sense, it isn't one.
my confusion is cleared.thank you professor.
Sir how can I show that an inertial frame of reference has constant velocity...?
by constant acceleration from newton's inertia law
Definition. That's what defines an inertial reference frame is constant velocity.
And in general relativity, zero gravity is also needed to define it as an inertial reference frame.
thanks so much for this! back to the textbook reading now that I understand this part!
Thank You Mr. Dave
Amazing explanation dude ....💪
You just explained the same concept in 6mins that took my physics teacher 3 months. It was so simple to understand?????
What can u say about Hilary Andales'
Relatavity & the Equivalence of reference frames.
I like professor Dave, he is so pure and positive man!!!❤️❤️
Thank you sir I was very eager to learn this my i completed 90 % of my internet but finally I learned because of u
wow, I won't be needing another video anymore. Hallelujah
Thanks sir . I can now understand the inertial reference frame 😀😀
thank you to give an wonderful explanation
My favourite science teacher forever
I really like the element of history included in teaching to show how humanity discovered something abd how we know it to be true . Without understanding history certain parts of the present are not comprehensive. I recently watched Veritasiums video on depressed cubics and how to solve them
Hey Dave wouldn't you explain relative motion examples like man and river, man and rain, two trains.....?
hi vaishu
Hello, I have a big doubt I think the part at 4:26 is wrong. From the point of view of the fish, the ball will fall in a vertical motion and for the guy who dropped the ball (Galileo Galilei), the ball will move backwards. I think this happens instead of the fish seeing the ball dropping in a parabolic path. Is this correct or am I mistaken?
The best intro ever
But initially you said that the observor sees the ball taking a parabolic path because the ball had all the horizontal velocity(of the train) and then later on you say that the ball and the person throwing the ball up dont undergo motion but their surroundings do and hence the ball falls vertically downwards and has a vertical velocity only, kindly clear my confusion.
so if a fly is hovering inside a car and the car guy gasses the pedal, would the fly splat on the back window or stay in place as the car speeds
So to my understanding : The ball falls ''straight'' down in a train or whatever because it has the same speed as the train, and upon leaving my hand, it basically continues flying forward with the trains speed but due to the train having the same speed it appears to just fall straight down, right?
yep i think that sounds about right!
Thanks for the vid
NO the only horizontal component of velocity is same as the velocity of train
The ball falls ''straight'' down in the train only because the train is not accelerating.
If you were born on a plane (600 mph ((relative to the ground)) and 10,000 m altitude at the equator) that never had to land, what would the difference in age be between someone traveling east and someone traveling west in 50 years?
Professor Dave, would we then say that the earth and the planets are moving around the sun relative to the space around them?
Thanks Mr Dave
I wish someone could explain how this relates to the portal paradox. I am confident that the portal moving towards a cube is the same as the cube moving towards the portal, but I just don't know how inertial frames of reference relate to environments on both sides of the portal. Why is it that an object only switches inertial reference frames after going through the portal?
Great Video, Thank you.
OMG !! You seemed to be like a mirror for me which displayed everything and made my views vast........... Just Thanks sir 🙏🙏Love from India ♥️
Hope could meet you sir
great and good explanation
Thank you this help a lot
as You told that space is moving @ 210 km/hr but pls tell me where in which direction
Seriously..mind blowing explanation 😀
Thank you Prof. Now I got a bit understanding in relativity (still studying)
This...is really helpful
How do you describe the motion of a coin dropped by a person in a moving car under the following conditions:
a. in a reference frame of the car ;
b. in a reference frame fixed on the Earth?
In the reference frame of a car, the coin will fall straight downward.
In the reference frame fixed on the Earth nearby the car, the coin will fall in the second half of a parabolic path, with its vertex at the top where the coin is released, and concave-down curvature.
Thanks professor.I don't really understand everything you said.But,to a point I grabbed the relativity between the moving car and the observer.
thank you so much!!
Great video!
great explanation