Physics Corner

Salam,

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

Wasalam

format_quote Originally Posted by islamgyal

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"

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

format_quote Originally Posted by seeker_of_ilm

Simplest definition :

"The process of adjusting a feature for accuracy"

Do you have any idea on how to do it from thermometer/thermocouple to oven?

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.

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

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).

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

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?

format_quote Originally Posted by Ameeratul Layl

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?

Salam,

So, no one is able to help?

Wasalam

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

format_quote Originally Posted by lolwatever

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

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).

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