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MS101: PhysicsMS101: PhysicsDr. Ahmed Amin HusseinDr. Ahmed Amin Hussein
May 3, 2023 Prepared By: Dr. Ahmed Amin 1
Agenda for TodayAgenda for Today
May 3, 2023 2Prepared By: Dr. Ahmed Amin
ExamsExams
May 3, 2023 3Prepared By: Dr. Ahmed Amin
Midterms and Final Exam:
•Questions on tests will look like those we do in the class and in homeworks•No surprises
Final Grade
•Mid Term Assessment (MTA) ------- 30%•Tutor Marked Assignment (TMA) ---- 20%•Final Examination ----------------------- 50%
Why Study Physics?Why Study Physics?
May 3, 2023 4Prepared By: Dr. Ahmed Amin
Physics is the foundation of every science (astronomy, biology, chemistry…).
Many pieces of technology and/or medical equipment and procedures are developed with the help of physicists.
Studying physics will help you develop good thinking skills, problem solving skills, and give you the background needed to differentiate
between science and pseudoscience.
Standard QuantitiesStandard Quantities
May 3, 2023 5Prepared By: Dr. Ahmed Amin
UnitsUnits
May 3, 2023 6Prepared By: Dr. Ahmed Amin
Length:Length:
May 3, 2023 7Prepared By: Dr. Ahmed Amin
Time:Time:
May 3, 2023 8Prepared By: Dr. Ahmed Amin
Mass:Mass:
May 3, 2023 9Prepared By: Dr. Ahmed Amin
Some Prefixes for Power Some Prefixes for Power of Tenof Ten
May 3, 2023 10Prepared By: Dr. Ahmed Amin
Scientific notationScientific notation
May 3, 2023 11Prepared By: Dr. Ahmed Amin
Scientific notationScientific notation is based on powers is based on powers of the of the base number 10base number 10. The scientific . The scientific notation in standard form is written as:notation in standard form is written as:
A x 10A x 10nn
wherewhere(a)(a) 1 1 A < 10 and A can be an integer or A < 10 and A can be an integer or decimal number.decimal number.
(b)(b) nn is a positive integer for a number is a positive integer for a number greater than one or a negative integer for a greater than one or a negative integer for a number less than one.number less than one.
Proportions:Proportions:
May 3, 2023 12Prepared By: Dr. Ahmed Amin
BA
BA 1
A is proportional to B. The value of A is directly dependent on the value of B.
A is proportional to 1/B. The value of A is inversely dependent on the value of B.
Example (1):Example (1):
May 3, 2023 13Prepared By: Dr. Ahmed Amin
weightcost
The more you buy, the more you pay. This is just the relationship between cost and weight.
To change from to = we need to know the proportionality constant.
(weight)pound)per (cost cost
For items at the grocery store:
Example (2):Example (2):
May 3, 2023 14Prepared By: Dr. Ahmed Amin
The area of a circle is .2rA
The area is proportional to the radius squared. 2rA
The proportionality constant is .
Example (3):Example (3):
May 3, 2023 15Prepared By: Dr. Ahmed Amin
Example: If you have one circle with a radius of 5.0 cm and a second circle with a radius of 3.0 cm, by what factor is the area of the first circle larger than
the area of the second circle?
8.2cm 3cm 5
2
2
22
21
2
1 rr
AA
The area of a circle is proportional to r2:
The area of the first circle is 2.8 times larger than the second circle.
Density:Density:
May 3, 2023 16Prepared By: Dr. Ahmed Amin
Dimensional AnalysisDimensional Analysis
May 3, 2023 17Prepared By: Dr. Ahmed Amin
Example (1):Example (1):
May 3, 2023 18Prepared By: Dr. Ahmed Amin
Example (2):Example (2):
May 3, 2023 19Prepared By: Dr. Ahmed Amin
Converting between different systems of unitsConverting between different systems of units
May 3, 2023 20Prepared By: Dr. Ahmed Amin
Example (3):Example (3):
May 3, 2023 21Prepared By: Dr. Ahmed Amin
Significant FiguresSignificant Figures
May 3, 2023 22Prepared By: Dr. Ahmed Amin
Significant FiguresSignificant Figures
May 3, 2023 23Prepared By: Dr. Ahmed Amin
Derived UnitDerived Unit
May 3, 2023 24Prepared By: Dr. Ahmed Amin
The SI unit of energy is the joule.
1 joule = 1 kg m2/sec2
Derived unit Base units
A derived unit is composed of combinations of base units.
TMA ExercisesTMA Exercises
May 3, 2023 25Prepared By: Dr. Ahmed Amin
Problems :
Page 20 # 23, 37, 43, Page 21 # 51
