@@yoprofmatt thanks for teaching the subject :) i couldnt find any video that catched my attention and manadged to keep it for longer than 2 minutes in portuguese before realising "oh wait,im bilingual and theres probably more videos in english than in portuguese" so i searched it up and am now seing your video and being able to learn the subject and i hope this will be enough to make up for me distracting myself and falling behind on class :)
@@yoprofmatt WHY AND HOW what are OBJECTS MAY FALL AT THE SAME RATE IN FULL CONFORMITY WITH WHAT IS E=MC2: CLEARLY, this is a gigantic breakthrough in physics AND mathematics. WHAT IS E=MC2 IS dimensionally consistent. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! GREAT. WHAT IS GRAVITY is, ON BALANCE, an INTERACTION that cannot be shielded or blocked !!!! MAGNIFICENT ! Consider what is THE EARTH/ground ON BALANCE !!! Consider what is THE EYE ON BALANCE !!! Now, consider what is the TRANSLUCENT AND BLUE sky. CLEAR water comes from what is THE EYE. (THE EARTH is ALSO BLUE.) Fantastic. The stars AND PLANETS are POINTS in the night sky. BALANCE AND completeness go hand in hand. It ALL CLEARLY makes perfect sense ON BALANCE. INDEED, LOOK at what is the orange (AND setting) Sun !!! GREAT !!! Consistent WITH WHAT IS E=MC2 (AND WHAT IS TIME), “mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent WITH/as what is BALANCED electromagnetic/gravitational force/ENERGY; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! (BALANCE AND completeness go hand in hand !!!) Great. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE (ON BALANCE), AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE) !!! This IS consistent with WHAT IS E=MC2 AND F=ma !!! (ACCORDINGLY, ON BALANCE, the rotation of WHAT IS THE MOON matches the revolution.) Indeed, inertia/INERTIAL RESISTANCE IS proportional to (or BALANCED with/as) GRAVITATIONAL force/ENERGY; AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE) !!! This IS consistent with WHAT IS E=MC2 AND F=ma !!! GREAT. ❤️❤️❤️ I have mathematically unified physics. FACT. THINK. By Frank Martin DiMeglio WHAT RELATES GRAVITY TO WAVE/PARTICLE DUALITY?: WHAT IS E=MC2 does. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! ACCORDINGLY, ON BALANCE, the rotation of WHAT IS THE MOON matches the revolution !!! The stars AND PLANETS are POINTS in the night sky. WHAT IS GRAVITY is, ON BALANCE, an INTERACTION that cannot be shielded or blocked. CLEAR WATER COMES FROM WHAT IS THE EYE. Consider what is THE EYE ON BALANCE, AND consider what is the TRANSLUCENT AND BLUE sky. Consider what is THE EARTH/ground. NOW, consider WHAT IS the ORANGE (AND setting) Sun ON BALANCE !!!! Great. THE EARTH is ALSO BLUE. Consider what is the BLUE flame. WHAT IS E=MC2 IS dimensionally consistent. Magnificent❤️. That what are OBJECTS may fall at the SAME RATE is FULLY consistent WITH WHAT IS E=MC2 !!! GREAT !!! TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE !!! Consistent WITH WHAT IS E=MC2 (AND WHAT IS TIME), “mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent WITH/as what is BALANCED electromagnetic/gravitational force/ENERGY; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Accordingly, ON BALANCE, what are OBJECTS may fall at the SAME RATE in FULL conformity WITH WHAT IS E=MC2 !!! Great. I have revolutionized physics. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE). This is consistent with WHAT IS E=MC2 AND F=ma. Accordingly, ON BALANCE, the rotation of WHAT IS THE MOON matches the revolution. Accordingly, ON BALANCE, what are OBJECTS may fall at the SAME RATE in FULL conformity WITH WHAT IS E=MC2 !!! Great. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE (ON BALANCE), AS TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY (AND NECESSARILY) proven to be gravity (ON/IN BALANCE) !!! This IS consistent with WHAT IS E=MC2 AND F=ma !!! I have surpassed Newton and Einstein. By Frank Martin DiMeglio
if you think he is writing backwards then he isn't. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eVOPDQ5KYso.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-CWHMtSNKxYA.html&feature=emb_title the teacher is writing normally like everyone. He just somehow flips the video, in this case very likely with video recording. If you do not believe, look at the professor. most of the teachers who write on glass seem to be left handed. But statistically mostly are right handed. So this means that the video has been flipped on the vertical axis, so in this way the words that look opposite look normal. While the teacher image will also be flipped, since he is inside that video or image. This is why a right handed person looks left handed and vice versa.
Connor, Talking to you, Connor! Too funny. I should add more names in randomly. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
My D&D Group wants to drop a group of elephants on a big bad enemy we encounter and so here I am learning about terminal velocity to see what height we need to drop it from in order to kill the boss. Thanks for the lecture Professor Anderson, I enjoyed learning!
Professor Matt ... i really really like your way of teaching ..I really understood well..you explain better than my high school teacher....i wish you were my class teacher. :)
my 2nd Remote (Online) Physics exam brought me here! But I was thinking the same thing.....(altho honestly, I'm nust sick of trying to learn Physics online... and we're not even half way thru the semester😭)..... where do you teach, Professor?
This helped me a lot to understand terminal velocity but what I am more interested in now is how he's writing backward for us viewers to understand what he's talking about.
FNAJ Development, Thanks for the comment, and yes it could use some updating. You might also like my new website: www.universityphysics.education Cheers, Dr. A
I have a questio: it is quite late like 8 years now but you said when we get to the terminal velocity the air drag will be equal to the gravitational force. Doesn't that mean the object making a free fall will be in balance.which I don't understand. And thanks
Prof.Anderson Somewhere around 10:00 you said the bowling ball would hit the ground first. If you were to switch the balloon with a basketball,they would fall at exactly the same rate. Even though their masses are still different.Why is this not true in the case of a balloon? If you could clarify that,it would help me a lot. Many thanks, Aaron.
I believe it has to do with the Buoyancy of the objects. In a vacuum, they absolutely would hit the ground at the same time, any 2 objects will regardless of mass or shape. They did this experiment in a giant vacuum chamber with a bowling ball and a feather. But in the case of a balloon or basket ball, the air inside it makes it buoyant, which is a force preventing it from falling as fast, as the denser bowling ball. The basic principles of fluid dynamics for water and air are the same, except the density of the environments are different. Imagine then, dropping the bowling ball and the basket ball into a pool, the bowling ball would sink, but the basket ball would float, despite being the same shape and despite the forces of gravity pulling them downward at the same constant force. This is because the basket ball is more buoyant than the bowling ball. The same thing happens in air, but to a lessened degree since air is much less dense than water. This is also the same reason why helium balloons float, despite the fact that both the balloon and the helium inside it have weight and therefore should be affected by gravity. But the buoyancy of the helium compared to air, creates a force greater than the downward force of gravity. Thereby pulling it up, instead of down. Floating, instead of sinking.
@@superbart3000 Firstly I'd like to thank you for taking your time and answering my question with such detail. I didn't take into account the buoyancy and I also believe it has something to do with that, but something still doesn't add up. You mentioned they'd fall and hit the ground at the same time in a vacuum but they would also hit the ground at the same time in absence of a vacuum (there's a video from Veritasium which shows this, though he is using a medicine ball instead of a bowling ball. Regardless, the priciple is the same). The reason for this is inertia as mention in the video. Is there something I'm not taking into consideration?
@@themeditatingdog6402 hmm, if they have the same drag and buoyancy isnt a factor. Then yes they should hit the ground at same time. On earth all objects fall at a constant acceleration of 9.8 m/s2 regardless of mass.
Hello Dr. Anderson, I am currently a freshman in college and I am majoring in physics, planning to do research in a field of physics someday, would you have any tips for the aspiring physicist? Thank you so much!
Yo I have been watching these videos for the last 10 years. How do these people write right to left? is the axis flipped in the settings of the camera?
10:07 the bowling ball does not hit the ground first due to gravity, it hits the ground first due to air resistance acting on it greater than the belon
Hello Dr. A. Sorry to bother. I wanted to confirm that at 10.26 you confirmed that the gravitational pull for the bowling ball due to its mass is more than the baloon. When we drop a bowling ball from 2nd floor to ground, the drag force will never be more than the gravitational pull (considering the mass of the ball). Which means that the body will be in constant acceleration till it hits the ground. But when we consider a=(w-d)/m acceleration is inversely proportional to mass. So greater mass should then mean less acceleration. I am confused. Please consider me un educated in physics and this curiosity is for a silly dream.
In theory - yes, but one thing to consider is that the balloon has air inside it - so in a vacuum, that balloon would surely burst. Take a feather and a bowling ball in a vacuum - yes they will fall at the same rate. In fact, there is a video right here on RU-vid of a feather and a bowling ball being dropped in a giant vacuum chamber and they indeed accelerate at the same rate.
Let's say I fire a rifle with a muzzle velocity of 300 m/sec (so that the bullet exits the barrel with an acceleration much greater than g) straight down from the plane? What happens to the bullet's velocity and acceleration on its path towards the ground? (Note that the muzzle velocity is also greater than terminal velocity.)
I have a doubt in the chapter "motion in one dimension ". I fail to understand the relation between acceleration and distance as it seems to be both directly proportional as well as inversely proportional. Pls help?
I get placing bV "AS" FDrag,,, but wouldn't it be tenebrous to Log them as either 'attrition/sharing' or catalyst/transport?' Covalent and ionic bonding aside, there's real promise with doing this: LogThermalE- Phi =|= 1.618>KinteticE: 2/1 ----> LogTE - bV =|= FDrag>KE: 2/1 Use this one since it "EQUALS:" LogKinetic- Pi = 3.142 LogKE- bV = FDrag
I know this is besides the point but can we all just take a moment that he has learned how to write backwards so we can see him AS he's writing on the glass(?).
I never liked classes where the teacher calls on students by name to answer questions. It made me so nervous I would end up not picking up anything from the lecture. I still got good grades in these type of classes because I just read the textbooks and studied hard.
Per Enflo, The ones in my audience were all volunteer, so they sort of knew I would call on them. But appreciate your comment. You might also like my new website: www.universityphysics.education Cheers, Dr. A
-CHARRED -, You will keep accelerating if you still have some sort of propulsion, like a rocket engine. And no you can never reach the speed of light because that would require infinite energy. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Matt Anderson So, even in vacuum, while I’m infinitely falling down by gravitation force (9,8) I will have some kind of terminal velocity, or I didn’t understand you properly?
@@imstuckwiththisusernamefor2190 You can't fall infinitely. You only fall if you are pulled by gravity. Gravity only pulls towards a large mass. To fall infinitely would mean the space between you and this large mass is infinite. One mass that has an gravitational pull strong enough to pull something from an infinite distance would turn the universe into a singularity, in which time and space wouldn't exist. You can't accelerate without time or space.
If there is no wind, you initially fall at an acceleration a = -g = -9.8 m/s^2. (The negative sign just means "down".) Once you start moving faster, you have to push air out of the way. This drag from the air lowers your acceleration until finally your acceleration is zero, hence terminal velocity. We only looked at the start (a=-g) and the end points (a=0), but the actual curve of your velocity is rather interesting. Hope this helps. Cheers, Dr. A
So when man is falling, the drag force acting on him is positive? Or as i think the gravitational force is in the same direction as the initial velocity so ‘g’ is positive and drag force opposite of initial velocity and is donated as negative. So what version is right ?
Positive and negative doesn't matter really. You just need to be consistent with it. For a two-dimensional problem, where there is only up and down. Just make sure if you use a positive number for the "up" direction, any other vector which points upward is also positive - and anything downward is negative. Or vice versa. Acceleration due to gravity is downward. Drag is upward. Initial velocity is zero, but will obviously be downward immediately after the initial state.
+indra fitriyanto Excellent question. In our model, we are simplifying it to the linear case, which works well for small speeds. For higher speeds, the quadratic is more appropriate. You'll see both versions in different textbooks. Probably for a skydiver we should be using the bv^2 option. Thanks much, keep up with the physics. Cheers, Dr. A
John Sumner, Great point. Somehow air resistance didn't kick in enough for him to tell a difference. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
If a=0 then velocity at every should be same but as object come down velocity will increase that is what g is.a=0 will only when par chute balance the velocity. If i am wrong correct me....
a = 0 refers to the net acceleration, it means that g does not accelerate the object anymore because the deceleration due to drag is equal and opposite.
You're correct. Initially after you jump, vertical velocity increases for a while until the air resistance = weight. At that point, a = 0 and the velocity is "terminal" (does not change). Cheers, Dr. A
Thank you for lecture sir.. I have doubt You said Ball will reach ground first... but according to galileo theory of dropping objects both should reach ground at same time... or atleast at same time.. Please help me out with my doubt... 🙏🙏
Galileo assumed it in vacuum, if u drop any object for instance a bowling ball and a feather in vacuum they will fall at exactly the same time. Now in practical world if u drop both u know, I know bowling ball will fall way faster and collide with the ground before the feather does, due to air resistance. By the way if you want to prove Galileo correct (LOL) just take a paper (exactly size of the note book) and a notebook . Place the paper just above the notebook then let it free fall.....AND abrakadabra they fall nearly in the same time. Reason - the air particles are displaced by the notebook for the the paper to freefall. (When I first tried it I was amazed) Just an Enthusiast !
You are right. But you have to taking into account buoyancy. Despite have the same shape and size. The basket ball is more buoyant, meaning because of its density compared to the air surrounding it, there is more of an upward buoyant force acting against it, canceling out some of the acceleration due to gravity. Imagine dropping both of these objects into a pool of water. The buoyancy force in that fluid environment would be so strong that the basket ball would not sink, yet the bowling ball would. Because the ball is filled with air which is less dense than water, and the bowling ball has a very dense center. The same thing happens in air, but to a lessened degree. The same thing also happens with helium balloons that would happen if you placed an air filled balloon at the bottom of a pool of water. The buoyant forces would pull both balloons upward, because of the density difference between the balloons and their environments.
Why then a watermelon and an egg thrown from same height hit the ground at same time, they both got different weight so terminal velocity must be different?
muhammed akram, Remember that + and - signs just indicate direction and that direction depends on your coordinate system. If you draw your coordinate system with +y going up, than a = -g. If you draw your coordinate system with +y going down, then a = +g. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Not really. Free fall is motion free from all forces - except gravity. Perhaps in the first few seconds of a skydiving jump, the drag is negligible and you are very close to free fall, but technically not. Near the Earth's surface, the gravitational acceleration is 9.8m/s², so when you first jump out of a plane, you accelerate at this rate, but almost immediately, drag is acting on you - which is a force in the opposite direction. This counters the force of gravity, so this net acceleration decreases. 9.7 m/s², then 9.6 m/s² and so on. The faster you go through the air, the higher the drag force becomes, so the more and more it counters gravity, so just before reaching terminal velocity, your net acceleration is 0.3 m/s², then 0.2 m/s², 0.1 m/s² and then finally - 0.0 m/s². You are now going so fast that the drag force equals the force of gravity, so acceleration stops. You will no longer get any faster. This is terminal velocity. You don't go from free fall (which is 9.8 m/s²) directly to terminal velocity. Your net acceleration gradually decreases as your speed increases (which is increasing the drag force - until it equals gravity).
The important detail is that there is air resistance. In the absence of air resistance, Fd would be zero and both objects would continue to accelerate at exactly 9.8m/s^2 and hence hit the ground at the same time.
This is false. -g isn't a negative. You would have the velocity on the hypotenuse of the airplane and the vertical of gravity. In a parabolic towards the ground ... Conservation of energy!
Good day sir, I so much love this video. Can you please teach me how make a video like this including devices needed for a production like this. Thanks
Good question. Remember that mg is a force. What this means is gravity is pulling on the object with a force equal to mg. If no other forces are present, then the mass m will accelerate at g because ma=mg. This is what happens when the skydiver first jumps out. However, with other forces present, the acceleration can be very different, since ma = mg - Fdrag. Thus if mg = Fdrag, then the acceleration is zero. This is when the skydiver reaches terminal velocity. Cheers, Dr. A
g is what it always was. a = 0 because F = 0. It's important to understand that this does not mean that there are no forces acting - it just means no *net* forces are acting. In other words, all forces cancel each other. Particular for something at terminal velocity, a = 0 because Fnet = 0. Fnet = Fgravity + F drag. If the two are equal, then the net force is zero - because they act in opposite directions. If the force of gravity is 50 Newtons (downward), then the force of drag is 50 Newtons (upward). The net force is therefore zero, so a = 0.
When The g=F(drag) Then The Net Force Is 0,if The Net Force Is Zero Then A Body Can Be Displaced Without Force? But The Body Is Still Coming Downward When The g=F(drag)....!confused
Remember that if the net force = 0 then there is no acceleration. But of course there can still be velocity. Remember that acceleration = change in velocity. When mg = Fdrag, the acceleration is zero which means the velocity must be constant. You're still falling down, but at a constant speed (and direction). This is what we call terminal velocity. It doesn't change. Hope this helps. Cheers, Dr. A
a man of 80 kg.falls freelly from height1000m. upto 500m.he falls freely then retarding and reaches at earth with velocity 10m/ s .calculate work done by resistive force
It doesn't really matter. It's just the designation given. If all values that are presented as positives were negatives and all values that were negatives were positives, you'd arrive at the same result, so it's arbitrary. But generally, down is negative and up is positive. g is an acceleration in the downward direction, ergo it's generally represented as a negative.
Uranium Studio, Great to hear. Who's John Petrucci? Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Are you a good person or not to be the one that has to do that to help him out with you and I will be there to do you I will die I will get him a little more and he can help me out with you and him to do it
Patrick, I completely agree. There is much more to this story that we need to develop. We're working on it. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A