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Author Topic: Edexcel PHYSICS Doubts  (Read 137891 times)

Offline Vampire-Love4ever

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Re: Edexcel PHYSICS Doubts
« Reply #270 on: January 02, 2011, 08:00:21 pm »
Quote from: ~ The Golden Girl  ~ on January 02, 2011, 07:45:14 pm
My Answer is :   They are the Same .

Why : it's because of the fact that they have the Same distance and same time .=]


thanks so much!

May Allah bless you :D


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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #271 on: January 02, 2011, 08:02:44 pm »
Your Welcome =]

And you too :)
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Offline Vampire-Love4ever

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Re: Edexcel PHYSICS Doubts
« Reply #272 on: January 02, 2011, 08:34:53 pm »
How do we know that the contact force will be downwards?
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Re: Edexcel PHYSICS Doubts
« Reply #273 on: January 02, 2011, 08:40:08 pm »
Another question:

My answer is different from the markscheme answer.

I get 2.95 but the mark scheme answer is 3.1

Does it make such a big difference?
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Re: Edexcel PHYSICS Doubts
« Reply #274 on: January 02, 2011, 09:05:02 pm »
Please explain this, it's really confusing :S
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Re: Edexcel PHYSICS Doubts
« Reply #275 on: January 02, 2011, 11:41:11 pm »
Quote from: ~ The Golden Girl  ~ on January 02, 2011, 08:34:59 am
it MUST pass through the Origin and hence ii) is NOT correct.

it should be a straight line to show the fact that they are directly proportional and Hence i) is NOT correct *I'll let someone confirm this though*



So, is hooke's law obeyed here? :S
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Re: Edexcel PHYSICS Doubts
« Reply #276 on: January 03, 2011, 03:41:16 am »
 It's supposed to be a NO , it does NOT obey Hooke's law cuz they are not directly proportional

If you have noticed ; they said ALLOW  BOTH marks for no , cuz they aren't proportional .

Why ; it's a Curve , it's not proportional , the K is not constant - as stated by the MS =]

I'll confirm this with someone though :)
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Re: Edexcel PHYSICS Doubts
« Reply #277 on: January 03, 2011, 07:41:23 am »
Quote from: Vampire-Love4ever on January 02, 2011, 09:05:02 pm
Please explain this, it's really confusing :S

Since it's moving Forward , this means F1 is the friction , and friction is caused by the road ....

Hence i)  F1 is the force of the Road on the Wheel
         
Since it's moving forward ,the wheels go forward , and hence they are exerting a force on the Road in order to move forward.

Hence ii) F2 is the force of the Wheel on the Road

Let me know if you don't get it ;)
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Re: Edexcel PHYSICS Doubts
« Reply #278 on: January 03, 2011, 07:47:53 am »
Quote from: Vampire-Love4ever on January 02, 2011, 08:40:08 pm
Another question:

My answer is different from the markscheme answer.

I get 2.95 but the mark scheme answer is 3.1

Does it make such a big difference?

can you get me the range Please from the MS .

usually if they said Estimate , the Question will have a WIDE range of answers and hence it'll be fine I guess. =]

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Re: Edexcel PHYSICS Doubts
« Reply #279 on: January 03, 2011, 07:58:25 am »
Quote from: Vampire-Love4ever on January 02, 2011, 08:34:53 pm
How do we know that the contact force will be downwards?

The First part of the Question before this One asks you to draw a fully labelled free-boy diagram for the magnet M1 .

which is you draw a dot an Arrow comes out UPWARDS , this represents the Repulsion due to M2
                                 another Arrow comes out DOWNWARDS , this represents the Weight *Pull of Earth*


This Means that ; When you draw the free-body Diagram of M2 you will do as follows* I draw it so that I don't get confused , I suggest u do it too ;) * :


Dot representing M2
an Arrow UPWARDS which represents the force exerted by the Wooden Base
another Arrow DOWNWARDS which represents the Repulsion from M1

And Hence Since it's Newton's third law Pair , the forced has to be reversed *kind of*

Since the Wooden Base acted UPWARDS , it's Pair will act DOWNWARDS

If you don't get it Let Me know ;)
« Last Edit: January 03, 2011, 08:00:55 am by ~ The Golden Girl ~ »
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Offline Vampire-Love4ever

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Re: Edexcel PHYSICS Doubts
« Reply #280 on: January 03, 2011, 08:30:42 am »
Quote from: ~ The Golden Girl  ~ on January 03, 2011, 07:41:23 am
Since it's moving Forward , this means F1 is the friction , and friction is caused by the road ....

Hence i)  F1 is the force of the Road on the Wheel
         
Since it's moving forward ,the wheels go forward , and hence they are exerting a force on the Road in order to move forward.

Hence ii) F2 is the force of the Wheel on the Road

Let me know if you don't get it ;)


I did the same as you but got it wrong.
This is the markscheme answer.
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Offline Vampire-Love4ever

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Re: Edexcel PHYSICS Doubts
« Reply #281 on: January 03, 2011, 08:34:28 am »
Quote from: ~ The Golden Girl  ~ on January 03, 2011, 07:58:25 am
The First part of the Question before this One asks you to draw a fully labelled free-boy diagram for the magnet M1 .

which is you draw a dot an Arrow comes out UPWARDS , this represents the Repulsion due to M2
                                 another Arrow comes out DOWNWARDS , this represents the Weight *Pull of Earth*


This Means that ; When you draw the free-body Diagram of M2 you will do as follows* I draw it so that I don't get confused , I suggest u do it too ;) * :


Dot representing M2
an Arrow UPWARDS which represents the force exerted by the Wooden Base
another Arrow DOWNWARDS which represents the Repulsion from M1

And Hence Since it's Newton's third law Pair , the forced has to be reversed *kind of*

Since the Wooden Base acted UPWARDS , it's Pair will act DOWNWARDS

If you don't get it Let Me know ;)

JazakAllah Khair.
I didn't see the wooden base :$ I was thinking of the stand the whole time :P
Thanks alot!
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Offline Vampire-Love4ever

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Re: Edexcel PHYSICS Doubts
« Reply #282 on: January 03, 2011, 08:37:25 am »
Quote from: ~ The Golden Girl  ~ on January 03, 2011, 07:47:53 am
can you get me the range Please from the MS .

usually if they said Estimate , the Question will have a WIDE range of answers and hence it'll be fine I guess. =]


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Offline aloha32

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Re: Edexcel PHYSICS Doubts
« Reply #283 on: January 03, 2011, 12:10:12 pm »
Hello!
I'm confused..What is the difference between the celcius scale and centigrade scale?

Thanks :)
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Re: Edexcel PHYSICS Doubts
« Reply #284 on: January 03, 2011, 01:27:36 pm »
the car thing ;

(a)

(i) As the car is moving forward, there should be a force applied on the road so that the car can move froth, that force is applied by the wheel of the car, power (energy) is given by the engine.

(ii) There is a backward arrow, showing that there is some force acting backwards. This might be due to the friction of the road. This force is faced by the wheel, so it gets the speed.

Otherwise the car will NOT BE SEEN.

by fidato - my friend =]
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