# GCSE Edexcel physics - 12th June 2014

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7 years ago
#21
(Original post by Akashi)
A = v-u/T. You can't just do A x v-u because v-u isn't dividing - it is being divided. Therefor its reciprocal is not do just multiply it out.
The numbers were 1.2 = 20-13/T. Using your method T would = 8.4. Insert it into the first equation (A = v-u/t). 1.2=7/8.4. It doesn't work.
Let's wait for other users.

Because our teacher told us that we rearranged correctly and that in order to get rid of divide and for t to become the subject, you had to times.

I don't know tbh but most people I know got 8.4

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7 years ago
#22
(Original post by Eradicating)
Let's wait for other users.

Because our teacher told us that we rearranged correctly and that in order to get rid of divide and for t to become the subject, you had to times.

I don't know tbh but most people I know got 8.4

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If it is 8.4 then why is it that 1.2 = 7/8.4 will not work? It's not logically possible. A = V-U/T = A x T = V-U =
T = V-U/A.

A = v-u/t =
1.2 = 7/8.4 (using your method). 7/8.4 = 0.83.

Using T = V-U/A and getting 5.83 as our answer and inserting it into A = v-u/t we get 1.2 = 7/5.83. 7/5.83 gives us our corresponding unit for acceleration.
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7 years ago
#23
(Original post by Akashi)
If it is 8.4 then why is it that 1.2 = 7/8.4 will not work? It's not logically possible. A = V-U/T = A x T = V-U =
T = V-U/A.
was 1.2 the acceleration,

Tbh maths isn't my strongest point. Idk [email protected] your probably right.

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7 years ago
#24
(Original post by Eradicating)
was 1.2 the acceleration,

Tbh maths isn't my strongest point. Idk [email protected] your probably right.

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Yes, 1.2 was the acceleration. If many people got 8.4 then, unfortunately, they've made a mistake and lost a few marks.
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7 years ago
#25
(Original post by Akashi)
Yes, 1.2 was the acceleration. If many people got 8.4 then, unfortunately, they've made a mistake and lost a few marks.
aw well!

Good on your math skills aha!

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7 years ago
#26
(Original post by Eradicating)
aw well!

Good on your math skills aha!

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Thanks, wasn't much though haha. Simply re-arranging easy formulae.

Btw if you have maths tomorrow then you should learn how to re-arrange formulas asap.
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7 years ago
#27
(Original post by Akashi)
Thanks, wasn't much though haha. Simply re-arranging easy formulae.

Btw if you have maths tomorrow then you should learn how to re-arrange formulas asap.

Cnt be asked 2 revise.

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7 years ago
#28
(Original post by Eradicating)

Cnt be asked 2 revise.

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I know how you feel. Revision is arduous and burdensome lol . Got physics done this morning (so lucky it had parts of C2 or I wouldn't be able to finish it).
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7 years ago
#29
(Original post by Akashi)
I know how you feel. Revision is arduous and burdensome lol . Got physics done this morning (so lucky it had parts of C2 or I wouldn't be able to finish it).
Exactly!

I learnt 4 topics at 4am to 8am! I literally never had time to touch the sciences except the night before.

Too much coursework etc. What are you aiming for? Me, A*/A* in physc and chemistry and A/A* (if lucky lol) in biology.

I'm good with exams so far.

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7 years ago
#30
(Original post by Eradicating)
Exactly!

I learnt 4 topics at 4am to 8am! I literally never had time to touch the sciences except the night before.

Too much coursework etc. What are you aiming for? Me, A*/A* in physc and chemistry and A/A* (if lucky lol) in biology.

I'm good with exams so far.

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I'll wait for my results to come in before I say anything haha.
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7 years ago
#31
(Original post by Akashi)
I'll wait for my results to come in before I say anything haha.
Better safe then sorry [email protected]

So what did you write for current \$ resistor one..

I wrote current flows through a resistor, transferring energy to the resistor making it heat up.

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7 years ago
#32
(Original post by Eradicating)
Let's wait for other users.

Because our teacher told us that we rearranged correctly and that in order to get rid of divide and for t to become the subject, you had to times.

I don't know tbh but most people I know got 8.4

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So what did you get 8.4?
Accelerations in m/s squared right ... I don`t understand
I got 4.9
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7 years ago
#33
(Original post by Eradicating)
Better safe then sorry [email protected]

So what did you write for current \$ resistor one..

I wrote current flows through a resistor, transferring energy to the resistor making it heat up.

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Electrons in the current collide with ions in the resistor releasing energy in the form of heat causing the resistor to heat up.
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7 years ago
#34
(Original post by Akira2014)
So what did you get 8.4?
Accelerations in m/s squared right ... I don`t understand
I got 4.9
Its 5.33

It was wrong rearranging lol

It was t=v-u/a

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7 years ago
#35
(Original post by Akashi)
Electrons in the current collide with ions in the resistor releasing energy in the form of heat causing the resistor to heat up.
But that was in metals?.

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7 years ago
#36
(Original post by Eradicating)
But that was in metals?.

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Nope? Electrons carry charge. When current passes through a resistor the electrons in the charge collide with the ions that make up the resistor. This causes heat energy to be released leading to the resistor heating up - this will get you full marks.
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7 years ago
#37
(Original post by Eradicating)
But that was in metals?.

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The wire is metal.
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7 years ago
#38
(Original post by Nothematic)
The wire is metal.
Ah, so that's what he is talking about.

The wire is metal as it is a good conductor of electricity.
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7 years ago
#39
Not looking to hot on this exam paper :-(
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7 years ago
#40
(Original post by Akashi)
Nope? Electrons carry charge. When current passes through a resistor the electrons in the charge collide with the ions that make up the resistor. This causes heat energy to be released leading to the resistor heating up - this will get you full marks.
It was two marks! So do I get a mark for stating it transfers energy?

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