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CI Advanced Subsidiary Level PhysicsCourse Code: 9702,[object Object]
Physics 9702AS & A2,[object Object]
The A Levels Physics course:,[object Object],Resource Materials:,[object Object],cie.org.uk,[object Object],http://www.xtremepapers.net/,[object Object],http://asphysics.edublogs.org/,[object Object]
Unit1: Physical Quantities & Units
Unit1: Physical Quantities & Units
Unit1: Physical Quantities & Units
A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.,[object Object],E.g.:,[object Object],	If the temperature T of a body is quantified (measured) as 300 kelvin this is written T = 300 x K = 300 K where T is the symbol for the physical quantity, and K is the symbol for the unit.,[object Object],What is a Physical Quantity,[object Object]
Physical Quantities are of two types:,[object Object],Base quantities,[object Object],Derived quantities,[object Object]
Base Quantities,[object Object]
Derived quantities:,[object Object]
For Derived Quantities,[object Object],When you are asked to write the units of a derived quantity in terms of its “base units”, then you recall its respective formula:,[object Object],Example: ,[object Object],Volume=l*b*h hence base units=m,[object Object],Area=l*l hence base units= m,[object Object],Speed=distance/time hence base units=m/s,[object Object],Therefore; as a golden rule, you are just supposed to recall the base units of the 7 base quantities we talked about and the rest would all be provided in the Question.,[object Object],Till now, we talked about general units of derived quantities, that’s why we didn’t say that derived quantities have SI units (remember how I said that Volume can have the units of liters, m ,cm ,dm ). Now we will look at the concept of SI “base units” and their nexus with derived quantities. ,[object Object],3,[object Object],3,[object Object],3,[object Object],3,[object Object],2,[object Object],The Base Units Concept,[object Object]
Recall how I said that the units on the LHS and the RHS of the equal sign should be the same: ,[object Object],i.e. Suppose ,[object Object],A=MD/C,[object Object],The base units of A are Kgmsec /m,[object Object],M=kg,[object Object],D=m,[object Object],Then find the base units of the quantity C.,[object Object],Make C the subject:,[object Object],C=MD/A, C=kg*m/kgmsec /m,[object Object],C=m/sec,[object Object],Q1. Units of acceleration.,[object Object],Q2. Find the units of Force using the formula: F=ma,[object Object],Q3. Units of Pressure? P=pgh,[object Object],2,[object Object],2,[object Object],2,[object Object]
Labeling Graphs:,[object Object],X axis independent quantity,[object Object],Y axis dependent quantity,[object Object],(Recall speed-time),[object Object],Table Columns:,[object Object],Time,[object Object]
Unit1: Physical Quantities & Units
Class Test,[object Object],Convert the following quantities into different SI prefixes. Show your entire working. An answer without working would earn a straight ‘zero’,[object Object], ,[object Object],Use the symbols for the units in your answer. Use of the standard form where appropriate will earn you extra credit,[object Object], ,[object Object],All questions carry 2 marks,[object Object],1.               145.56s to milliseconds (ms),[object Object],2.              127845.64ms to seconds (s),[object Object],3.              123923593426.2 microseconds (μs) to seconds (s),[object Object],4.              67000.75 km to m,[object Object],5.                65.7mm to km,[object Object],6.               85.9km to mm,[object Object],7.              6.7m to μm (micrometer),[object Object],8.               7800540032.54μm to km,[object Object],9.             7807.089J (joules) to MJ (mega joules),[object Object],10.           6574.56 MJ to J,[object Object]
After you will be done with the A 'level syllabus, you will be in a position to give a rough estimate of quantities you have studied in your course. ‘,[object Object],Till now, you can give a rough estimate of quantities like:,[object Object],height of the door?,[object Object],diameter of pencil / pencil lead ,[object Object],volume of brick / liquid in drinking cup ,[object Object],mass of brick / person / nail ,[object Object],time between your hiccups? ,[object Object],Just to give you a feel of what kind of estimate questions you can see in your past papers:,[object Object]
May/June 2008, Paper 2, question 1 ,[object Object]
Unit1: Physical Quantities & Units
Thank you,[object Object],Be the Change that you want to witness in the World.,[object Object]

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Unit1: Physical Quantities & Units

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Hinweis der Redaktion

  1. Talk about measuring instruments which work on different scales:Micrometers VCRulersMeasuring tapesEtc.
  2. allow anything in range 20 Hz -> 20 kHz [we know that a bat produces and hears sounds btw 20000Hz to 120000Hz and elephants hear a frequency which is infrasonic- they communicate miles away with their peers at very low frequencies which we humans can not hear. This is 15 hz or less hence we say that audible range is 20Hz to 20KHz.]b. allow anything in range 10 nm -> 400 nmVisible light has a wavelength of 400-700nm so since UV radiations are on the right side of the EM spectrum and hence a greater frequency, Hence they should have a lesser wavelength so you can write anything below 400nm.c. allow anything in range 10 g -> 100 a tomato has a mass of 15-20 grams, so a big plastic ruler would be a bit less than a tomatoes mass and hence 10-15grams d. allow anything in range 0.1 kg m–3 -> 10 kg m–3Something between 1-5 kg/m-3, actually its 1.22kg/m-3 at sea level