Physics Corner

Ameeratul Layl said:
:sl:
So, in that case, the graph would show proportionality (horizontal line)?
Would you say it is for all metals?

:w:
Click to expand...

:sl:

Dunno....my thinking is...because Resistivity depends on

1) Resistance
2) Length
3) Cross-Sectional Area

When a metal is melted...all three of these change. Therefore resistivity would change.

Not sure about the graph thing though sorry
 
Salam,

Could anyone explain Calibrate? I have searched on Wikipedia but the definition just drags on. I just need a simple definition-inshAllah.

Wasalam
 
make fine adjustments or divide into marked intervals for optimal measuring; "calibrate an instrument"; "graduate a cylinder" or mark (the scale of a measuring instrument) so that it can be read in the desired units; "he calibrated the thermometer for the Celsius scale" 3: measure the caliber of; "calibrate a gun"
 
islamgyal said:
make fine adjustments or divide into marked intervals for optimal measuring; "calibrate an instrument"; "graduate a cylinder" or mark (the scale of a measuring instrument) so that it can be read in the desired units; "he calibrated the thermometer for the Celsius scale" 3: measure the caliber of; "calibrate a gun"
Click to expand...


:sl:

I have been confused more than ever.
Thank you for trying though :)

:w:
 
:sl:

I will be sending in my revision notes for Physics. Anyone who wishes to take part in revision lessons is more than welcome. I thought it would be nice to remember the AS work so when we return to college, we do actually know what the teacher is talking about. Therefore, A2 will inshAllah be much easier to understand.inshAllah.:w:
 
:sl: Brothers and sisters,

Here are the Physics revision notes as promised.inshAllah. (more to come.inshAllah).


Speed and Velocity Graphs- Constant Motion


First, we must understand the concept of vector and scalar quantities.
• Scalars are quantities which are fully described by a magnitude alone.
• Vectors are quantities which are fully described by both a magnitude and a direction

Now that you understand the difference between vectors and scalars, we will have a look at two important examples of these, namely speed and velocity, in more detail.

Speed and Distance

The definition of speed is:

Speed = Distance / Time



Speed is measured in meters per second (ms-1)

Because =
Distance is always measured in Meters
Time is always measured in seconds

The best way to imagine a situation, in which several physical quantities are changing, is by drawing a graph. To picture the behaviour of the speed of an object, we plot the distance (from the top of the equation for speed) on the vertical axis and the time (from the bottom of the equation for speed) on the horizontal axis.

Here, the total distance travelled ( y) divided by the time taken ( x) is the gradient of the slope. This is also equal to the average speed of the object - remembering that

Speed = Distance / Time

In this case, the speed is constant as the slope of the distance-time graph is constant.By re-arranging the equation we can plot slopes of either distance, or time, on a graph to find their values. For example, we can see how to find the distance from a speed-time graph by rearranging to get:


Distance = Speed x Time
 
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:sl:

Velocity and Displacement


Displacement is a vector quantity that describes a distance moved, in a particular direction. The change in an object's displacement with time is called velocity:

Velocity = Displacement / Time


( To be continued.inshAllah. If you wish to continue with producing notes for this topic. Then feel free to do so.inshAllah).

:w:
 
Salam,

I think it would be better if I did not post the whole of the AS Syllabus in this thread, rather, we discuss something that we find difficult. I believe this will be better.inshAllah.
So, does anyone find anything difficult?

Wasalam
 
:sl:

No one needs help with Physics? SubhanAllah.

I do need help.

If:

Resistance = Resistivity x Length
------------------
Cross Sectional Area

Then, could:

Resistivity = 1
----
Conductivity

Also be used?

:w:
 
Ameeratul Layl said:
:sl:

No one needs help with Physics? SubhanAllah.

I do need help.

If:

Resistance = Resistivity x Length
------------------
Cross Sectional Area

Then, could:

Resistivity = 1
----
Conductivity

Also be used?

:w:
Click to expand...

Salam,

So, no one is able to help?

Wasalam
 
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Salam,

Can someone simplify the 'vectors' topic? I'm finding it a little difficult to understand. I know trig and pythag is used, but the questions seem so much more difficult. I admit, I have forgotten the topic.

Wasalam
 
salams sis.. just noticed ur question ... wouldn't

Conductivity = 1 - Resistivity?

I havn't seen a formula for conductivity as such, but i'm pretty sure that's how they're related...

as for vectors, maybe u could giv us a few questions u hav trouble with n we might b able 2help? vectors is a bigggggg topic.

tc salams
 
lolwatever said:
salams sis.. just noticed ur question ... wouldn't

Conductivity = 1 - Resistivity?

I havn't seen a formula for conductivity as such, but i'm pretty sure that's how they're related...

as for vectors, maybe u could giv us a few questions u hav trouble with n we might b able 2help? vectors is a bigggggg topic.

tc salams
Click to expand...


:sl:

JazakAllah lolwatever.But, can we start off with something else as this is expected to help me in vectors.

if: 1mm = 1 x 10 (to the -3)m

Do you know the rest of thesethingys. Sorry, I have forgotten the term used for them.
I had a sheet with all the...thats it-converstions and I have lost it. We have to convert alot in Physics and was wondering if anyone could help. I only remember 1 conversion (as shown above).

:w:
 
oh yeh my dad made me a lil neat one.. ill look 4it n get bak2u if i find inshalah
salam
 
kilo-----hecta----deca----units-----deci-----centi-----milli
10^3---10^2 --- 10 -------1------10^-1----10^-2-----10^-3
kg-------hg--------dag------g--------dg-------cg-------mg---------- mass
kl -------hl---------dal-------l----------dl--------cl--------ml----------volume
km------hm------dam--------m-------dm-------cm------mm---------distance


so for example... from the above table.. we can see that 1 decimeter equals 10^-1m.

hope that helps
tc salams
 
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