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# Physics i dont know where to start watch

1. Ok so i never took GCSE exams at school and as an adult its not available at colleges. so i have no choice but to self teach as an external candidate using a secondary school as a host for exams. I want to be a doctor and i understand biology perfectly.

My issue is maths i also never took maths at school i have a fair knowledge of maths like adding subtracting multiplying and also degree of shapes etc but physics is confusing me i turn my page in my text book and its asking me to work out something i have no idea how anyone can understand that when the concept hasnt been explained can any one tell me how to better understand whats being asked or where i should start with this. Like which parts of maths is needed so i can learn that aswell

the question im refering to is under the subheading speed in action

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2. I assure you the answers are there on the pages in front of you ;P

For part b, remember it told you on the first page that speed ( = Distance / Time) is represented by the gradient of the graph (because its axes are distance and time). If you know about biology you probably know how to calculate the gradient of a line. If not, definitely learn about that. It's easy.

For part c it wants you to realise that on the given graph, when time is elapsing but distance is not changing, the object must have speed 0. Distance isn't changing - it isn't moving! Remember that speed equals the gradient of the line. What's the gradient of a horizontal line?

Part d is a bit of an odd question because the textbook hasn't really talked about averages (on those pages at least). The Average Speed for the whole journey must be the total distance travelled over the total time taken for that journey.

It's just the same equation applied a little differently: Average Speed = Total Distance / Total Time
3. (Original post by vickie89uk)
Ok so i never took GCSE exams at school and as an adult its not available at colleges. so i have no choice but to self teach as an external candidate using a secondary school as a host for exams. I want to be a doctor and i understand biology perfectly.

My issue is maths i also never took maths at school i have a fair knowledge of maths like adding subtracting multiplying and also degree of shapes etc but physics is confusing me i turn my page in my text book and its asking me to work out something i have no idea how anyone can understand that when the concept hasnt been explained can any one tell me how to better understand whats being asked or where i should start with this. Like which parts of maths is needed so i can learn that aswell

the question im refering to is under the subheading speed in action

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speed is given in units of distance divided by time e.g. miles per hour or meters per second

e.g. if you drive 70 miles in 2 hours your average speed in miles per hour is
(number of miles)/(number of hours)
=70/2
=35mph

that example is looking at gradients, the line with the steepest gradient represents the highest speed because it's covering a greater distance (y axis) in each unit of time (on the x axis).

tbh you might be better off taking a maths nightschool course as A level physics is going to lean on it a lot.
4. (Original post by Thorsas)
I assure you the answers are there on the pages in front of you ;P

For part b, remember it told you on the first page that speed ( = Distance / Time) is represented by the gradient of the graph (because its axes are distance and time). If you know about biology you probably know how to calculate the gradient of a line. If not, definitely learn about that. It's easy.

For part c it wants you to realise that on the given graph, when time is elapsing but distance is not changing, the object must have speed 0. Distance isn't changing - it isn't moving! Remember that speed equals the gradient of the line. What's the gradient of a horizontal line?

Part d is a bit of an odd question because the textbook hasn't really talked about averages (on those pages at least). The Average Speed for the whole journey must be the total distance travelled over the total time taken for that journey.

It's just the same equation applied a little differently: Average Speed = Total Distance / Total Time
Ah so what your saying is the vehicle stopped moving at 500 and started again at 1000 so for 500 seconds it was stopped that answering question b. Is that right.

They make it sound so complicated

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5. (Original post by Joinedup)
speed is given in units of distance divided by time e.g. miles per hour or meters per second

e.g. if you drive 70 miles in 2 hours your average speed in miles per hour is
(number of miles)/(number of hours)
=70/2
=35mph

that example is looking at gradients, the line with the steepest gradient represents the highest speed because it's covering a greater distance (y axis) in each unit of time (on the x axis).

tbh you might be better off taking a maths nightschool course as A level physics is going to lean on it a lot.
So is that 20000 metres/1500

Im doing gcse and maths wasnt an option this year im alright with most things but some of the terminolgy is different to watch it was when i was at school

Thank you

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6. Gradients are M over x y

X is across
Y is up
(In a line graph)

So to find m you have to do
Y/X and then whether its postive or negative

Is that correct

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7. (Original post by vickie89uk)
Gradients are M over x y

X is across
Y is up
(In a line graph)

So to find m you have to do
Y/X and then whether its postive or negative

Is that correct

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Yep you got it . One way to remember it is "rise over run".

For physics you will probably also need

m = (y2 - y1) / (x2 - x1)

Same idea just means gradient m = "change in y divided by change in x". That's GCSE maths too.

Definitely though would be worth taking a maths course somewhere or at least buying a GCSE maths textbook to look at because even GCSE phys will require a fair bit of maths. Nothing advanced or difficult, but just things you're expected to know!
8. might help... http://www.bbc.co.uk/education/topics/zwvg9j6
9. (Original post by Thorsas)
Yep you got it . One way to remember it is "rise over run".

For physics you will probably also need

m = (y2 - y1) / (x2 - x1)

Same idea just means gradient m = "change in y divided by change in x". That's GCSE maths too.

Definitely though would be worth taking a maths course somewhere or at least buying a GCSE maths textbook to look at because even GCSE phys will require a fair bit of maths. Nothing advanced or difficult, but just things you're expected to know!
Thank you i will look into a maths textboom the maths course was full when i applied this year and ive spent £150 on exam fees for science its the aqa 8404H course. I have to sit 6 exams. I will have a look in waterstones tomorrow for a book. Also been looking on youtube as i find it easier if someone explains the process to me, seeing someone work it out infront of me.

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10. Do u recommend all of those topics first before I continue confusing myself.

Thank you very much

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11. (Original post by vickie89uk)
Do u recommend all of those topics first before I continue confusing myself.

Thank you very much

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I suppose 'distance speed and time' is the most relevant but I think it should all help (except possibly probability)
12. (Original post by Joinedup)
I suppose 'distance speed and time' is the most relevant but I think it should all help (except possibly probability)
Ill have a look through i take the next week or so just getting familiar with the maths. Im worrying because my first exam is may 12th and im worried i wont get through all this information and understand it in time

Thank you

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Updated: January 11, 2015
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