Hi there! So all of these playlists are already available - they sometimes don’t show up on the Home Screen unless you click the title - it should expand and show you all the playlists. If you still can’t find them, comment back here and I can post direct links. There are playlists for nearly every single chapter - I’ve only got about 3 left across both years of content 👍🏼
if a ball is travelling upwards is acceleration always -9.8 and if it is free falling downwards +9.8 no matter which direction is chosen to be positive
That’s not the case. Acceleration is always downwards - it doesn’t matter if you set positive as up or down. If you set positive as down, then acceleration is positive. If you set positive as up, then acceleration is negative.
@@BicenMaths alot of people dont understand the explanation for a ball going upwards that acceleration is positive (when you set the downwards direction as positive) since when you throw ball upwards, its first decelerationg (-1) and going against your rule that downwards is positive (-1) 2 negative make a positive
Does the velocity and the acceleration have to be different signs to one another going when going in one direction (for example upwards or downwards)? Does a negative acceleration have to be paired with a positive velocity?
No, definitely not. Something could be falling towards the ground, and acceleration is also towards the ground, so we have them both in the same direction, meaning both could be considered positive or negative depending on the direction you set as + or -.
@3:10, can i just clarify they dont have the same displacement because A could be faster or slower than B but we dont know so we cant say its exactly the same displacement. or is it because A's origin is different to B's origin, and thats why we cant say theyre the same ?
Either 2 or 3 sf is fine - but if you do more than 3sf then you can lose a mark. It states this on the front of the exam paper, so you can read it just before you do it as a reminder! :)
It is because everything that has direction in mechanics can be considered as a vector - but rather than a 2D vector, we just do it in one dimension i.e. up or down, left or right, etc. With vectors, we know that negative numbers are assigned to things going left, or down, and positive for up, or right. We could easily have assigned them in a different way, but they help us with calculations associated with direction! So with mechanics, we can set the direction for positive, and then go from there. I hope that helps!
@@BicenMathshow do we know that it’s 50-h and not 50+h? As far as I can see it could be either. If the ball fell from rest then it would certainly be 50-h but as it’s projected upwards it could be either no? Any help would be appreciated
@@sammak30 like he said in the last video, the caltulations doesnt know the ball was projected 50 meters above ground, so we take 50 away from it because its done in assumption its from the ground
Hello, your videos are amazing.
When will the playlists for Forces and motion & Variable acceleration be published ?
Thanks 😁
Hi there! So all of these playlists are already available - they sometimes don’t show up on the Home Screen unless you click the title - it should expand and show you all the playlists. If you still can’t find them, comment back here and I can post direct links. There are playlists for nearly every single chapter - I’ve only got about 3 left across both years of content 👍🏼
@@BicenMaths ok thanks
if a ball is travelling upwards is acceleration always -9.8 and if it is free falling downwards +9.8 no matter which direction is chosen to be positive
That’s not the case. Acceleration is always downwards - it doesn’t matter if you set positive as up or down. If you set positive as down, then acceleration is positive. If you set positive as up, then acceleration is negative.
@@BicenMaths alot of people dont understand the explanation for a ball going upwards that acceleration is positive (when you set the downwards direction as positive) since when you throw ball upwards, its first decelerationg (-1) and going against your rule that downwards is positive (-1) 2 negative make a positive
Does the velocity and the acceleration have to be different signs to one another going when going in one direction (for example upwards or downwards)? Does a negative acceleration have to be paired with a positive velocity?
No, definitely not. Something could be falling towards the ground, and acceleration is also towards the ground, so we have them both in the same direction, meaning both could be considered positive or negative depending on the direction you set as + or -.
@3:10, can i just clarify they dont have the same displacement because A could be faster or slower than B but we dont know so we cant say its exactly the same displacement. or is it because A's origin is different to B's origin, and thats why we cant say theyre the same ?
It's because A's start point (origin) is different to B's, so we are talking about how they have displaced from their start positions!
is it compulsory to round to 2sf or can i round to 3sf? some answers on MS and textbook answers are in 3sf
Either 2 or 3 sf is fine - but if you do more than 3sf then you can lose a mark. It states this on the front of the exam paper, so you can read it just before you do it as a reminder! :)
small question here so when we use simultaneous equation do we mostly s=ut+atsquared
Yes, that’s very common for this type
Why can we use different directions as positive and negative? And do we have to do that
It is because everything that has direction in mechanics can be considered as a vector - but rather than a 2D vector, we just do it in one dimension i.e. up or down, left or right, etc. With vectors, we know that negative numbers are assigned to things going left, or down, and positive for up, or right. We could easily have assigned them in a different way, but they help us with calculations associated with direction! So with mechanics, we can set the direction for positive, and then go from there. I hope that helps!
Do you have the answer to the question right at the end ?
T=25/9 and h=17.7
Page 4 pmt.physicsandmathstutor.com/download/Maths/A-level/M1/Papers-Edexcel/June%202013%20(R)%20MA%20-%20M1%20Edexcel.pdf
@@BicenMaths How is it h-50 dont understand that part
@@moa7651 The displacement is the same as h but 50 left - a diagram will help!
@@BicenMathshow do we know that it’s 50-h and not 50+h? As far as I can see it could be either. If the ball fell from rest then it would certainly be 50-h but as it’s projected upwards it could be either no? Any help would be appreciated
@@sammak30 like he said in the last video, the caltulations doesnt know the ball was projected 50 meters above ground, so we take 50 away from it because its done in assumption its from the ground