1. 1- Measurement 2- Motion Along a Straight Line 3- Vectors 5- Force and Motion 7- Kinetic Energy and Work 14- Fluids 16- Waves — I 17- Waves — II

2.  Physics is based on experimental observations and quantitative measurements.  The main objective of physics is to find the limited number of fundamental laws that govern natural phenomena.  What is physics: Measurement Chapter 1

3. 1-3 The international system of units  Basic  Derived  1- Basic physical quantities in Mechanics  Physical Quantities:

4. 1-3 The international system of units  S.I units (International System of Units ) which Known as (MKS ) system: meter, kilogram, second.  Two other systems of units are also in use:  Unit Systems: o (CGS) system o British system

5. 1-3 The international system of units Length meter (m) centimeter (cm) foot (ft) Mass kilogram (kg) gram (g) slug (sl) Time second (s) second (s) second (s) System S.I CGS British Table 1-2 Units of Measurement  Table 1-1 shows the units for the three base quantities.  Derived quantities are defined in terms of these base units (speed, force, energy,…).

6. 1-3 The international system of units  Prefixes :  Are used to designate common multiples in power of ten. Table 1-3 Common Prefixes

7. 1-4 Changing units

8. Some conversion factors: Some conversion factors: 1 day = 86400 second ( s ) 1 mile (mi) = 1.609 kilometers (km) 1 yard (yd) = 3 feet (ft) 1 foot (ft) = 30.48 centimeter (cm) 1 inch (“) = 2.54 centimeter (cm) 1 Pound - mass (lb) = 0.45 kilogram (kg) 1-4 Changing units

9. Examples: a typical bacterium is about 5 micrometers ( or microns ) in length. Give this length in meters. Solution: 1-4 Changing units

10. Problem 1 page 8: Answer:

11. Problem 12 Page 9: Answer:

12.  Meter : Length of the path traveled by light in 1/299,792,458 second.  Second : Time required for 9,192,631,770 periods of radiation emitted by cesium ( Cs – 133) atom. 1-5 Standards of Length, Time, and Mass An atomic Clock

13.  Kilogram : Platinum cylinder in International Bureau of Weights and Measures, Paris. 1-5 Standards of Length, Time, and Mass