chapter1- Summer 2021-22.pptx

MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Chapter 1:Physical quantities and Dimensional Dr. Ohoud Aljawi MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Learning Outcomes: 1.Distinguish between base and derived physical quantities. 2.Use SI units in basic calculations. 3.Apply metric prefixes...

MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Chapter 1:Physical quantities and Dimensional Dr. Ohoud Aljawi MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Learning Outcomes: 1.Distinguish between base and derived physical quantities. 2.Use SI units in basic calculations. 3.Apply metric prefixes appropriately. 4.Apply unit conversion appropriately. 1.1 Physical quantities and unit MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES All quantities in science consist of number (magnitude ) and unit. In physics the quantities is divided in two groups base and derived quantities. TODAY'S QUOTE https://youtu.be/yldFcm5oVmA 1.1 Physical quantities and unit A. Base Quantities: MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES There are seven base quantities in physics. Thereby forming the basis of the International System of Units used through scientific world known as IS units. Unit Name meter second Kilogram Kelvin ampere mole luminous intensity candela TODAY'S QUOTE Quantity Length Time Mass Temperature Electric current Amount of substance Unit Symbol m s Kg K A mol cd MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Which of the following is not a base quantity? TODAY'S QUOTE A. Mass B. Electric current C. Weight D. Temperature MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES TODAY'S QUOTE Exercise: Determined the base quantity and the SI unit in the following pictures? 1. Physical quantities and unit MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES B. Derived units Many derive quantities are defined in terms of these base Quantity quantities. Relation with Base Unit Symbol Special TODAY'S QUOTE and Derived Quantities =formula Area Length × Width Volume Length × Width × Height Density Mass ÷ Volume Speed Distance ÷Time Acceleration Change In Velocity ÷Time Force Mass × Acceleration Pressure Force ÷ Area Work Force × Distance Work ÷Time Power Name m ×m = m2 m ×m ×m = m3 kg / m3, kg m−3 m/s m/s2 Newton (N) Pascal(Pa) Joule (J) Watt (w) MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Exercise 2: INSERT PICTURE HERE The unite for work is joule(J). What is this in base SI unit? INSERT PICTURE INSERT PICTURE HERE HERE The unite for power is watt (w). What is this in base SI unit? The unite for force is newton (N). What is this in base SI unit? 1.2 Prefixes MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES • Prefixes is convenience method when dealing with very large or very small measurements. • The standard form N×10n where 1 ≤N<10 and n is an integer. INSERT PICTURE HERE INSERT PICTURE INSERT PICTURE HERE HERE • Example: https://youtu.be/54tag7XQFpw 1.3 Prefixes Prefix MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Abbreviation INSERT PICTURE Power HERE nano micro milli centi deci kilo mega giga INSERT PICTURE HERE n μ m c d k M G 10 −6 10 10−3 10−2 -1 10 3 10 6 10 9 10 −9 INSERT PICTURE HERE MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Rewrite the following quantities using suitable prefixes HERE INSERT PICTURE Quantities A) 5000 000 J B) 48 000 g C) 0.0009 s D) 485 000 N E) 0.000 007 m Prefixes INSERT PICTURE INSERT PICTURE HERE HERE MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES ❑ Rewrite the following measurements in the units INSERT PICTURE HERE suggested INSERT PICTURE INSERT PICTURE HERE HERE ❑ How many bytes of memory space are in an 80 GB hard disk? MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES INSERT PICTURE Which time is the longest? -6 A.10 ms B.100 ms 6 C.10 ns D.100 ns HERE INSERT PICTURE INSERT PICTURE HERE HERE 1.3 Dimensional analysis MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES INSERT PICTURE A. Dimensional Analysis: HERE • A method used to convert a physical measurement from one dimensional unit to another. • It will involve INSERT PICTURE INSERT some easy math (multiplication &PICTURE division) HERE HERE B. Conversion factor: A unit conversion factor is a fraction whose numerator and denominator are equivalent measures. Some common unit conversion factors are given below Example: 1 inch = 2.54 centimetres 1 dozen = 12 MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES INSERT PICTURE 2- Choose the correct answer HERE A rattlesnake is 2.44 m long. How long is the snake in cm? INSERT PICTURE INSERT PICTURE HERE HERE a) 2440 cm b) 244 cm c) 24.4 cm MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES INSERT PICTURE 2- Choose the correct answer HERE A rattlesnake is 2.44 m long. How long is the snake in cm? INSERT PICTURE INSERT PICTURE HERE HERE a) 2440 cm b) 244 cm c) 24.4 cm MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES PICTURE 2- How many minutes are inINSERT 2.5 hours? HERE INSERT PICTURE INSERT PICTURE HERE HERE 3- You have $7.25 in your pocket in quarters. How many quarters do you have? MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES PICTURE 2- How many minutes are inINSERT 2.5 hours? HERE INSERT PICTURE INSERT PICTURE HERE HERE 3- You have $7.25 in your pocket in quarters. How many quarters do you have? MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES 2- How many seconds are in 1.4 days? INSERT PICTURE HERE Unit plan: days hr min seconds INSERT PICTURE INSERT PICTURE HERE HERE MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES 2- How many seconds are in 1.4 days? INSERT PICTURE Unit plan: days hr min HERE seconds INSERT PICTURE INSERT PICTURE HERE HERE MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES Convert Square and Cubic units: INSERT PICTURE HERE ▪Use the conversion factors you already know, but when you square or cube the unit, don’t forget to cube the number also. ▪Best way: Square or cube the ENTIRE conversion factor. INSERT PICTURE INSERT PICTURE HERE HERE Example: Convert 4.3 cm to mm 3 3 MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES INSERT PICTURE HERE Example: 3 3 Convert 4.3 cm to mm INSERT PICTURE INSERT PICTURE HERE HERE Review Points : MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES INSERT PICTURE HERE 1. physical quantity is a quantity that can be measured and consists of a numerical magnitude and a unit. 2.The physical quantities can be classified into base quantities INSERT PICTURE INSERT PICTURE HERE and derivedHEREquantities. 3.There are seven base quantities: length, mass, time, current, temperature, amount of substance and luminous intensity. 4.The SI units for length, mass and time are metre, kilogram and second respectively. 5.Prefixes are used to denote very big or very small numbers. MOHAMMED AL-MANA COLLEGE FOR MEDICAL SCIENCES THANK YOU