Mechanics of point particles why study physics ? Physics is the science on which all other natural and engineering sciences are built. All modern technological advances back directly to basic physics. A good grasp of essential physics concepts gives you a solid foundation on to construct advanced knowledge in all sciences . Physics is intimately connected with mathematics , because it brings to life the abstract concepts used in trigonometry, algebra, and calculus.
Mechanics of point particles why study physics ? 5. Science, especially physics, helps remove irrationality from our explanation of the world around us . 6. Physics has helped us to obtain a deeper understanding of our surrounding snd has given us greater ability to control them 7. Physics drives much of the technology essential to progress in chemistry and the life science . 8. Thus we need to acquire scientific literacy an essential tool for every citizen in our technology-driven society. 9. A billion is equal to a thousand millions (1,000 x 1,000,000).
Mechanics of point particles Working With Numbers A measurement is the combination of a number and a unit . How to deal with very big or very small numbers . Scientific notation Number = mantissa x 10 exponents To multiply two numbers in scientific notation, we multiply their mantissas and then add their exponents . To divide two numbers in scientific notation ( A / B ) we divide the mantissa of A by mantissa of B and then subtract the exponent of B from exponent of A.
Mechanics of point particles Working With Numbers Choose the correct answer to the following questions ( page 27 ) 1.1 Which of the following is the frequency of the musical note C5. A ) 376 g b) 438 m/s C ) 523 Hz d) 265 J
Mechanics of point particles Working With Numbers Rules of Significant figures : The number of significant figurers is the number of reliably known digits . For example : 2.34 has ----------- significant figures , while 1.3 has ----- significant figurer . If you give a number as an integer, you specify it with infinite precise . For example you have 5 finger in your hand. Leading zero do not count as significant digits. Trailing zero, on the other hand, do count as significant digits. For instance, the number 2.3400 has ----------significant figures . Numbers in significant notation have as many significant figures as their mantissa. for example, the number 3.33 x 1033 has ------ significant figures , because that is what the mantissa ( 3.33 ) has . The size of exponent has no influence . You can never have more significant figures in result than you start with in any of factors of a multiplication or division . For example : 3.43 x 2.5 = 6.890 x 6.2 = 9.05 x 10 = Role for adding and subtracting: We should see to the decimals for both numbers, then the result should have the least numbers of decimals, for instance: a ) 3.56+2.1 = b) 4.1 + 2 = c ( 6.7 + 2 =
Unit Abbreviation Base Unit for Unit Names and Abbreviations for the Base Units of the SI System of Units Unit Abbreviation Base Unit for Meter m Length Kilogram Kg Mass Second S Time Ampere A Current Kelvin K Temperature Mole mol Amount of a substance candela cd Luminous intensity
1. 3 Compare three SI units millimeter, kilogram, and microsecond 1.3 Compare three SI units millimeter, kilogram, and microsecond. which is the largest ? a)Millimeter c) microsecond b)Kilogram d) the units are not comparable