This guy is so good at explaining it I finally understand it my teacher explains it for 2 seconds then asks a bunch of questions then yells when we don’t understand
Thanks for the comment. I'm glad to hear that my videos are being used in India. I spent around three weeks in your country a few years ago and had an amazing time.
are you sure that only triple students need to know this? My teacher taught us it one time and i do combined. I'll try and learn it anyway but is there an AQA spec that states this is only for triple? Thank you ! My exam is tomorrow, really dreading it.
I have a few questions: First of all, if there is no air resistance in the beginning and it slowly increases, wouldn’t that cause deceleration because the resultant force is decreasing? But then the air resistance would only increase if the skydiver is accelerating so I don’t know. Also why is the skydiver accelerating when falling? Also why doesn’t the sky diver accelerate upwards when they open the parachute if the resultant force acts upwards? Secondly, I don’t understand how the second terminal velocity is lower if the weight is constant throughout and the air resistance matches the weight at terminal velocity.
Can you sort them into playlist. I know is gonna take some time but it is easier for later when we are revising. In other words can you put all the chemistry into one playlist same for bio and also physics. Thanks
I'm doing triple science and my paper 2 physics mock is tomorrow. The only unit my teacher covered in it is forces so your videos are great help, thanks! I had to teach myself a full unit of chemistry as well. Thank god I can leave this school soon.
Hello! Thank you very much for your videos, they are extremely useful for me and my friends for revision :) I would like to know if the GSCE flashcards on your website are suitable for the new 9-1 exams, and if not - which I suspect will be the case - will you be making new ones after you're done with all your videos? Thanks again for the amazing help!
Why does the skydiver accelrate during the start of the journey when the wight (the downward force) is constant? It might sound like a silly question, but i'd be grateful if you could help.
At the start of the journey, the weight (ie the downward force) is MUCH greater than air resistance (the upward force). Because there is a resultant force acting downwards, the skydiver accelerates downwards. Remember that Newton's second law states that acceleration is directly proportional to the force acting.
I don't understand at the start how the weight is greater than the air resistance. According to Newton's Third Law of Motion, wouldn't the forces immediately be equal and opposite?
Air resistance depends on velocity (ie how quickly the object is moving through the air). When the skydiver has just jumped out of the airplane, their velocity is effectively zero (they've literally just jumped). So air resistance is effectively zero. This means that their weight (which does not change) is greater than their air resistance at the beginning.
@Freesciencelessons Sir, why does the skydiver continue to fall in terminal velocity? I suppose the drag force balances the weight force so no force acts and object stays in place.
And then they can land safely by deploying a parachute with a large surface area, increasing air resistance and slowing their descent for a safe landing@@theultratuber5959
No I'd suggest that you just watch all the videos in a topic area once through to get the feel for it, while jotting down the odd key word. Then watch any again that you struggled with. Then see how much you can recall. Try to narrow it down to the areas that you really struggle with.
I make revision cards (one for each video) which just have the key points. Worked for me in my mocks (got a 9), so hopefully, they will work for me the real thing and for you!
Hello again! (Sorry...) I noticed that the line for deceleration is linear but the one for acceleration is curved. Is that because the surface area increases (almost) instantly and so the change to the air resistance isn't happening over time (unlike when it increases due to velocity changing)? If so, why doesn't it stop being linear as the velocity starts to decrease? I may be overthinking this...
It's not strictly linear really, it just takes place over a very short time so it appears linear on the graph. Once the majority of the deceleration has taken place, the deceleration continues at a more gentle pace.
@Freesciencelessons Sir I had a doubt regarding the parachute opening at terminal velocity specifically. Sir I understood what happens if the parachute is opened at terminal velocity. However can you please let me know what will happen if the parachute is opened before reaching the terminal velocity(during the acceleration due to weight before air resistance has balanced with weight.[the smooth line curve on the graph])?
OK, before the skydiver reaches terminal velocity, they are accelerating towards the Earth. This is because their weight (the downward force which does not change) is greater than air resistance (the upward force). If they open their parachute at this point, then the force due to air resistance will massively exceed their weight and they will decelerate, reaching a constant velocity. This will be their terminal velocity. Notice that this terminal velocity will be less than the terminal velocity they would have eventually reached if they had not opened their parachute. This is because they will not have had as long to accelerate towards the Earth than they would if they had not opened their parachute and reached terminal velocity without it.
It's not specifically mentioned in the spec but you are meant to be able to describe the motion of objects reaching terminal velocity and this is a great example.
Hi. It's not on the spec anymore. It has been replaced with using moles to balance equations. However, if you search my channel for empirical formula, you'll find the old video and that explains the idea.
A resultant force causes an object to accelerate. An object that is already moving does not need a resultant force to keep moving (this is Newton's first law).
i would say the moment they fall, since the only force is practically their weight and the acceleration is close to 10m/s^2. once air resistance comes into play, the resultant force only gets increasingly less intense. as F=m.a and the value of the mass is constant, then the acceleration must only decrease until it eventually becomes ceases to exist, when the intensity of air resistance matches the intensity of weight. after that the parachute is opened.
How is he falling when it is terminal velocity. I mean where is the speed from, from which he is falling. I know there is no need for acceleration but there is need for speed. Edit: i GOT IT. The speed form before when he was accelerating has now decreased. ohhhhh. Thanks man for your videos.
Hi sir So I'm doing combined science so the problem is that for chemistry and physics I struggle due to the maths but for biology it's easy for me as there isn't much maths compared to chemistry and physics so I was wondering is it possible to do foundation for chemistry and physics but do higher for biology ya that's all thxs
Hi. I don't think it is I'm afraid. It used to be but now the exams only have one entry code, rather than one for each subject. You should ask your teacher incase your exam board allows it.
Freesciencelessons yes I know but the thing is I wouldn't mind getting 5s for chemistry and physics because I don't think I can get any higher where as for biology I can get 6/7 because I find it much easier and I do way better for biology
hi sir i want to ask u a question (are u secretly a jesus messiah?) like has he sent you down to help us keep ourselves together even on the brink of committing suicide due to these science exams?
This guy is so good at explaining it I finally understand it my teacher explains it for 2 seconds then asks a bunch of questions then yells when we don’t understand
kind of hard to take u serious when ur user is jokin abt bojo
Thanks sir. I am from India .this channel is very helpful for me.
Thanks for the comment. I'm glad to hear that my videos are being used in India. I spent around three weeks in your country a few years ago and had an amazing time.
@@Freesciencelessons You look like my physics teacher, and this is not a joke. xD
Showed a teacher in my school your videos, now the whole school is watching :D
When it was explained using the graph,felt like a piece of cake.😉
50reason why 6
i never understood this topic until i watched this video. thank you sir. god bless and protect you.
Wallahi dis man is goated 🐐🐐🐐🐐. I watxhed like 5 10min long videos and couldnt understand anything but this 4 min video is some 🐐🤌🏽
I have been trying to understand this concept for years now, thank you for making me understand in just a few minutes. Legend.
Truley the best teacher ever like how do u have these very good teaching skills!!
are you sure that only triple students need to know this? My teacher taught us it one time and i do combined. I'll try and learn it anyway but is there an AQA spec that states this is only for triple? Thank you ! My exam is tomorrow, really dreading it.
noooooo what happened to the old intro music?
I have a few questions:
First of all, if there is no air resistance in the beginning and it slowly increases, wouldn’t that cause deceleration because the resultant force is decreasing? But then the air resistance would only increase if the skydiver is accelerating so I don’t know.
Also why is the skydiver accelerating when falling?
Also why doesn’t the sky diver accelerate upwards when they open the parachute if the resultant force acts upwards?
Secondly, I don’t understand how the second terminal velocity is lower if the weight is constant throughout and the air resistance matches the weight at terminal velocity.
Thanks sir. I'm from oman... I always watch your videos. These are really helpful. You explain really well just in a few minutes
I'm from Oman as well!
Bro you are the top drilla. My brother. You are the top G
Is this only for TRIPLE science student?
Because i do higher combined science and i do this in class.
This is EXTREMELY helpful!!
hi sir, do we need to be able to estimate typical speeds of the velocity before and after opening the parachute?
"This velocity is extrimely great because if the skydiver hits the ground they will die." someone here hates skydivers
Can you sort them into playlist. I know is gonna take some time but it is easier for later when we are revising. In other words can you put all the chemistry into one playlist same for bio and also physics.
Thanks
Shivas Patel yes but he posted that two years ago they might not have been then.
I'm doing triple science and my paper 2 physics mock is tomorrow. The only unit my teacher covered in it is forces so your videos are great help, thanks! I had to teach myself a full unit of chemistry as well. Thank god I can leave this school soon.
4 years late lmao. how did it go? sorry you had an Incompetent teacher
Last minute cramming 😅
Thanks you very goodly this video makes it very easier to learnt
Hello! Thank you very much for your videos, they are extremely useful for me and my friends for revision :) I would like to know if the GSCE flashcards on your website are suitable for the new 9-1 exams, and if not - which I suspect will be the case - will you be making new ones after you're done with all your videos? Thanks again for the amazing help!
Why does the skydiver accelrate during the start of the journey when the wight (the downward force) is constant? It might sound like a silly question, but i'd be grateful if you could help.
At the start of the journey, the weight (ie the downward force) is MUCH greater than air resistance (the upward force). Because there is a resultant force acting downwards, the skydiver accelerates downwards. Remember that Newton's second law states that acceleration is directly proportional to the force acting.
@@Freesciencelessons Thankyou so much for responding so quickly and clearing my doubt. Your videos are of great help! : )
Your lessons are the best! 😃
exam in 10 minutes lol
This is paper 2
Rip
Lmao how much did u get? I have a exam tomorrow
@@hudaebrahim6543and how much did u get?
Thank you so much you’re the best
How does the Drag force and gravitational force became equal after opening by parachute ?
thank you so much!!!! when i found your videos one nigt before my exams I was a grade 2 at best then I watched your vids and got all grade 9's!!!
howw the hell does that work
I don't understand at the start how the weight is greater than the air resistance. According to Newton's Third Law of Motion, wouldn't the forces immediately be equal and opposite?
Air resistance depends on velocity (ie how quickly the object is moving through the air). When the skydiver has just jumped out of the airplane, their velocity is effectively zero (they've literally just jumped). So air resistance is effectively zero. This means that their weight (which does not change) is greater than their air resistance at the beginning.
@@Freesciencelessons Thanks so much for the explanation
Thank youuuuuuuu this helped me a LOT
@Freesciencelessons Sir, why does the skydiver continue to fall in terminal velocity? I suppose the drag force balances the weight force so no force acts and object stays in place.
when a moving object reach eqilibrium it will continue moving in a consant velocity, the diver would stay in place if they wheren't moving
And then they can land safely by deploying a parachute with a large surface area, increasing air resistance and slowing their descent for a safe landing@@theultratuber5959
Why does the terminal velocity decrease? Doesn't the terminal velocity depend on the mass?
No terminal velocity depends on the air resistance.
I love this video sooo much thank you
Beautiful explanation
When person open his/her parachute the net force is upward then why it doesn't go upward
Great video once again!!👍🏻
do you know if we are allowed to highlight the questions on a GCSE paper.
Yes you are. I'd strongly encourage that you highlight the key information.
Pro Beatz you can use highlighters just not in you answer
Is it possible to finish this topic by tomorrow??
Thanks, helped me out.
ANYONE HELP!!!!!!! Am i supposed to copy down all the notes on this video to revise or is there another quicker more effective way??
No I'd suggest that you just watch all the videos in a topic area once through to get the feel for it, while jotting down the odd key word. Then watch any again that you struggled with. Then see how much you can recall. Try to narrow it down to the areas that you really struggle with.
Thank you so just watching the videos should be enough?
Melodious No, jot down stuff that you don’t know already.
I make revision cards (one for each video) which just have the key points.
Worked for me in my mocks (got a 9), so hopefully, they will work for me the real thing and for you!
what is the formula for air restaince
Hello again! (Sorry...) I noticed that the line for deceleration is linear but the one for acceleration is curved. Is that because the surface area increases (almost) instantly and so the change to the air resistance isn't happening over time (unlike when it increases due to velocity changing)? If so, why doesn't it stop being linear as the velocity starts to decrease? I may be overthinking this...
It's not strictly linear really, it just takes place over a very short time so it appears linear on the graph. Once the majority of the deceleration has taken place, the deceleration continues at a more gentle pace.
Ah, thank you! That makes sense:D Thank you so much for everything!
If the air resistance is greater than weight,wouldn't that make you flying upward?
No because you were initially accelerating downwards and gravity wouldn't allow you fly upwards anyway
Really good explantaion of terminal velocity but could you slow down and analyse more SIR pls.
Can you please check all playlists are updated e.g the biology paper 1 playlist has the correct videos etc - i wouldn't want to miss anything out :)
@Freesciencelessons Sir I had a doubt regarding the parachute opening at terminal velocity specifically. Sir I understood what happens if the parachute is opened at terminal velocity. However can you please let me know what will happen if the parachute is opened before reaching the terminal velocity(during the acceleration due to weight before air resistance has balanced with weight.[the smooth line curve on the graph])?
OK, before the skydiver reaches terminal velocity, they are accelerating towards the Earth. This is because their weight (the downward force which does not change) is greater than air resistance (the upward force). If they open their parachute at this point, then the force due to air resistance will massively exceed their weight and they will decelerate, reaching a constant velocity. This will be their terminal velocity. Notice that this terminal velocity will be less than the terminal velocity they would have eventually reached if they had not opened their parachute. This is because they will not have had as long to accelerate towards the Earth than they would if they had not opened their parachute and reached terminal velocity without it.
@@Freesciencelessons Thank you I understood the concept. My exam was awesome😎. Excellent videos💯! I subscribed to this channel👍
Do we need to know this particular sky diver example for the exam?
It's not specifically mentioned in the spec but you are meant to be able to describe the motion of objects reaching terminal velocity and this is a great example.
Breh this is tri[le physics and my teacher wants the class to revise this (I'm Year 7) but I get it anyway this is really helpful
Do you know what chapter from kerboodle is on paper 1 for all 3 sciences my teachers all say different things.
have you done a chemistry 9-1 empirical formula video sir?
Hi. It's not on the spec anymore. It has been replaced with using moles to balance equations. However, if you search my channel for empirical formula, you'll find the old video and that explains the idea.
@AIC Gamer What did you get
If air resistance balances the skydiver's weight why doesn't the skydiver stay still??
A resultant force causes an object to accelerate. An object that is already moving does not need a resultant force to keep moving (this is Newton's first law).
When does the sky diver experience the highest acceleration?
i would say the moment they fall, since the only force is practically their weight and the acceleration is close to 10m/s^2. once air resistance comes into play, the resultant force only gets increasingly less intense. as F=m.a and the value of the mass is constant, then the acceleration must only decrease until it eventually becomes ceases to exist, when the intensity of air resistance matches the intensity of weight. after that the parachute is opened.
Any chance of 9-1 biology paper 2 videos
How is he falling when it is terminal velocity. I mean where is the speed from, from which he is falling. I know there is no need for acceleration but there is need for speed.
Edit: i GOT IT. The speed form before when he was accelerating has now decreased. ohhhhh. Thanks man for your videos.
so it is to say that the skydiver is safe when he/she hit the ground due to the lower terminal velocity?
oo azs Yes Sir. There are two terminal velocities - one when the parachute is deployed. And the other one is prior.
amazing sir
Hi sir
So I'm doing combined science so the problem is that for chemistry and physics I struggle due to the maths but for biology it's easy for me as there isn't much maths compared to chemistry and physics so I was wondering is it possible to do foundation for chemistry and physics but do higher for biology ya that's all thxs
Hi. I don't think it is I'm afraid. It used to be but now the exams only have one entry code, rather than one for each subject. You should ask your teacher incase your exam board allows it.
Freesciencelessons I do AQA
So do I have to do foundation for all
Well you will either have to do foundation for all or higher. Remember that you can get up to a level 5 in foundation.
Freesciencelessons yes I know but the thing is I wouldn't mind getting 5s for chemistry and physics because I don't think I can get any higher where as for biology I can get 6/7 because I find it much easier and I do way better for biology
thanks 😢
skydiving seems fun now ngl...
hi sir i want to ask u a question (are u secretly a jesus messiah?) like has he sent you down to help us keep ourselves together even on the brink of committing suicide due to these science exams?
Is this topic nearly completed?
Joshua Carpenter yes it is nearly.
IKR it’s so long
god bless youuuuuuuuuuuu
At 1 minute 19 secs, you said there is no resultant force, I thought its meant to say the resultant force is 0? Or am I just dumb lol.
it means the same thing. eg if there are no oranges, there are 0 oranges.
are you gona finish biology paper 2 on time??!
Yes. I'm about to start it.
thx mahn
right now if i was the parachutist i wouldn't increase my air resistance by opening my parachute.
Why does he say skydiver like that
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