GCSE Physics Revision "Distance-Time Graphs"

[@adminspiderman5378]

I will always remember you when I become a doctor in the future. YOU ARE THE BEST TEACHER EVER!!!

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What uni?

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sitting my last gcse today, last day of year 11, this guy has been carrying me for 2 years now . thank you for everything . it all feels so surreal.

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Yep, absolutely.

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Full 9s 😂 I'm tryna pass

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@@faarishaque9142 same here bruh

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lmao xd

[@chloemazonde42]

This is where I copy my notes from ....so simple and straightforward thank you so much

[@phase0400]

Im kind of lucky that I have a good physics teacher although for the other sciencees the teachers take so long explaining things. For physics the teacher teaches things fast and tries to help us on things we dont understand and when he doesnt know how to explain a thing or two we get to watch this legend.

[@noodles.]

why are you better than my actual teacher

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Because they have visuals

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In which grade r u studying?

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[@mahraba874]

in year 10, theyve set us so much glad they set us this dude

[@a_active9904]

How do we know what number to plot in the tangent like there are so many distance to choose.

[@Freesciencelessons]

To draw a tangent, go to the time that you're interested in and go up to the line. Place a dot on the line and then draw a straight line so it just touches the dot. This is your tangent line. The length of the tangent line is not critical (as a tangent is essentially a ratio) so make it as long as you can so it's more accurate.

[@Visual_Gag]

How did you get that tangent? Why do you stop drawimg that tangent specifically in the way you did. Why is that as large as you could make it and not continue drawing the line? Also why at that specific angle? Im really struggling to understand.

[@Freesciencelessons]

It doesn't matter at all how big your tangent is as effectively it's a ratio. As the length increases, so does the height by the same proportion. However, if you make it larger, it's simply easier to read. The angle is simply judging by eye, so that the tangent grazes the curve at the dot.

[@krishnavadgama2322]

Exactly what I was going to ask!!!!!!!!!!

[@tomiwaidowu5915]

Freesciencelessons Big Brain

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its such a samjehame

[@halimeeeee]

can't thank you enough sir!! beyond relaxed to have discovered your channel. To let you know, you're famous here in Pakistan as well 😌😊🇵🇰

[@Nebulant_editz]

the future of learning.

[@faizafizzi9595]

You explain very well .I was really worried about it.but after watching this video am feeling relax

[@harlem8764]

Does it matter how long we make the tangent?

[@Cussifi]

Karma nope

[@eljefe4502]

No it dont

[@saviyothegamer5412]

Not really Caz you’ll get the same answer

[@tomtative]

If it’s longer your final answer will be more accurate

[@mufaronyabereka]

Coming back to this after getting an A* in my gcses

[@yawtwo]

straight to the point. excellent presentation

[@CarbiineZ]

I acc love you, such a life saver sometimes :)

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i love you toooo

[@yasmine2556]

sometimes?? you mean ALWAYSSS

[@amelie3745]

how do you know how long you should draw the tangent line or does it not matter?

[@Freesciencelessons]

It doesn't actually matter but generally I'd recommend drawing them as large as you can, since the final answer will be more accurate that way.

[@amelie3745]

Ah, thank you! I have a test on this topic tomorrow and your videos are so useful and help me a lot as I sometimes struggle with Physics!!

[@gurisandhu7354]

How do I know when to stop to the gradient line ?

[@Freesciencelessons]

You should make the gradient as large as you can as that will make your final answer more accurate.

[@johnkramer5886]

Quick question. Does the tangent need to touch the X axis or do I leave it like you did?

[@lordgrimixb]

Do we not add the two gradients together

[@fatimasajid1951]

this is litterally what i was going to ask so do we add or not??

[@alaa7055]

if we want to find the average speed of the whole journey we use the equation "Total distance/Total time" hope this helps! :)

[@lordgrimixb]

@@alaa7055 oh wow I forgot I wrote this. He didn't add the two in the vid so I was confused but it's all good now.

[@davidpierce2690]

What if there is 2 gradients and they are only asking for one???

[@tanishkabumrah]

yeah i dont understand

[@MudkipOnYT]

Who else’s teacher puts this guy on instead of actually teaching? thanks for the lessons btw!

[@fatimasajid1951]

proffessor why dont we add the 2 gradients>??? pls reply asap

[@lorenadavidson7646]

im stuck also lol

[@adrismohammed1128]

Where do i get your workbook from?

[@Freesciencelessons]

I'm afraid that I haven't produced those yet so they'll be available from late 2018-2019.

[@Inferno-ob9td]

Freesciencelessons where are they mate. It’s 2019

[@noor-wb5kc]

@@Inferno-ob9td they're up now

[@katanagamez4891]

What do you mean as largest as we can make it?

[@ttv_xolitov1375]

can you draw a curve on the distance time graphs?

[@Freesciencelessons]

If the object is moving at a constant speed, you draw straight lines. If the object is accelerating or decelerating then you draw a curve.

[@mrnothere9542]

Quick question how do you know how big the tangent is suppose to be?

[@Freesciencelessons]

You should make your tangent line as large as reasonably possible as that makes it easier to read accurately.

[@mrnothere9542]

@@Freesciencelessons thanks

[@HuzaifaTahaRangwala]

brilliant explanation!!! thank you so much !!!

[@dodosaud7859]

Omg I love this guy so much 😭

[@zgamer_5632]

What about the Triangle Gradient?

[@inshrahali8786]

dont get the second part of the journey? can somebody help

[@x_b5259]

Did you get it now?

[@zakimike7938]

so how would i answer it if said find the speed 20 secs after it started to move

[@Freesciencelessons]

If the distance-time graph is a straight line, then the speed is the same no matter what the time (the speed is the gradient of the line). If the graph is not a straight line, then you would need to draw a tangent at 20 seconds and determine the gradient of the tangent to determine the speed.

[@hamzahhh490]

Hi, I'm quite confused as to- how do you know when to stop drawing your tangent line. Is there a specific rule i have to follow? Thank you

[@chantelle5170]

It can be as long or as short as you want. But a longer line will be easier to read.

[@darshan7771]

It doesn't matter at all how big your tangent is as effectively it's a ratio. As the length increases so does the height by the same proportion. However, if you make it larger, it's simply easier to read. The angle is simply judging by eye, so that the tangent grazes the curve at the dot.

[@ala0284]

It’s easiest to draw it to a point on a nice to use integer

[@sriramsaradhi4441]

why do exams exist 😭😭😭😭😭😭😭😭😭😭

[@shaziaakhtar4027]

wait im confused why did u draw the tangent up to 20 and then draw the rectangle like those r the answers how did u get the answers specifically if you said the tangent can be however long

[@Freesciencelessons]

Can you tell me the time point in the video that you're referring to? I'll then be able to answer your question about tangents.

[@shaziaakhtar4027]

@@Freesciencelessons 4:11 why did u mark 20 and 160 and then draw the red lines if the tangent was shorter or longer would the answer be wrong

[@daliaserr5672]

my teacher explained this so badly thank you

[@awallace6035]

Could you please tell me how I could get the subtitles into Chinese? I show a lot of your videos to my classes and the overseas pupils would benefit from this if its not too difficult. Many thanks and please keep up the excellent work.

[@user-ep8xo1od9o]

i think you can translate it and add them yourself. a simple google search should explain how you can do so :)

[@plutosstrawberries]

can the tangent be longer than the length of the curve. please reply asap!!

[@Freesciencelessons]

Yes a tangent can be as long as you want. It just needs to touch the curve at the point that you're interested in. A longer tangent makes the final answer more accurate.

[@plutosstrawberries]

@@Freesciencelessons oh, i tried to answer your question myself, i ended up getting 20m/s, is that incorrect?

[@asuslaptop9288]

what does a straight diagonal line on the graph mean

[@tanishkabumrah]

it means it moving at a steady speed

[@artwithleah4145]

Hello sir, thank you for these useful videos.

[@rebecca2361]

Hi lol

[@asiyekaraca5]

Hi.I m 2025 igcse student but i cant doing physics graphs topic. If anyone know , can say where can i found video about this topic?

[@abbycat9848]

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[@mohammadmursal3053]

This hurts my brain D:

[@adminspiderman5378]

Did you do it?

[@elecaniv_0077]

what is the question tho, eg: plot a graph?

[@blu298]

absolute legend

[@erenyeager6668]

do you add the two gradients together, sir?

[@choudhrysaab8667]

Thank you sooo much really helpful

[@lucarooney7212]

why can you not draw the tangent bigger?

[@Freesciencelessons]

You can draw the tangent as large as you want to. Ideally a tangent should be large as it's easier to read accurately.

[@lorcanfitzpatrick6019]

Thank you so much!!!!!!!

[@katiejohns8247]

Is this the video mr Keith wants up to watch anyone in their lesson now

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Big ups Shaun

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true Geordie

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i watched this at school :)

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ok ?

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he taught me 1+1=2(jk u teach very well)

[@zainm217]

brilliant thank you

[@marcosherrero7508]

pls do a video on velocity time graphs

[@Freesciencelessons]

I cover those in the video on acceleration.

[@irfanfazila]

anyone else see the honey advert before watching the actual video? lol

[@Zxrlorn]

LAST EXAM TOMORROW LET'S GOOOO

[@ilyasali1989]

I don’t get the tangent

[@uzumakisora261]

Same i understood everything else but dont get tangent

[@Humnaliii]

for the tanget question do you get 140 because you have to do 160 subtract 20 after drawing in the tangent

[@Freesciencelessons]

Yes that's correct. 140 is the length of the vertical part of the tangent (160-20).

[@mominnaveed4440]

i have a triple science entry test on friday so can u help me

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when you have to stop watching....... :'(

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[@mohammadislam6609]

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How old are you sir?

[@darshan7771]

immortal

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Farwell

[@farahjaffer2392]

Can you tell me why the tangent didn't go up till 180 m and why did you only make it as long as 160 m

[@Freesciencelessons]

Yes. The actual length of the tangent does not matter as effectively it's a ratio (as the height increases, the length increases by the same proportion). A tangent should be large to make it accurate. I could have went to 180 but in this instance 160 was large enough. I hope that answers your question.

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93rd comment

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