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Phys 1111K Spring 2005

Phys 1111K Spring 2005. Course Overview Dr. Perera Room: 507 Science Annex Phone: 651-2709, 3221/3222. Introduction. What is Physics ? Understanding nature Laws of Physics Wide spread impact on modern technology Every minute of your life is involved in Physics

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Phys 1111K Spring 2005

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  1. Phys 1111KSpring 2005 Course Overview Dr. Perera Room: 507 Science Annex Phone: 651-2709, 3221/3222

  2. Introduction • What is Physics ? • Understanding nature • Laws of Physics • Wide spread impact on modern technology • Every minute of your life is involved in Physics • Needs and Uses Even without knowing it • A Fundamental Science  Welcome to Introduction to • Physics

  3. MainSections • Kinematics • Classical Mechanics (Chs 1-10) • both Transnational and Rotational Dynamics • Fluid Mechanics (Ch 11) • Thermodynamics (Chs 12-13) • Heat • Temperature

  4. Ch 1 Pre Requisites • Co-ordinate System (Cartesian) •      Trigonometry • Pythagorean Theorem • Sinθ • CosθPythagorean Theorem • Tan θ • Algebra • Quadratic Equations • Powers of 10 • Symbols • Δx, μ,n, p

  5. CGS British SI Length centimeter (cm) foot (ft) meter (m) Mass gram (g) slug (sl) kilogram (kg) Time second (s) second (s) second (s) Standards and Units • Why do we need standard units ? • King Louis • Yard • Royal foot

  6. SI Units • Le System International Units • meter : Light travels in a vacuum in time of 1/ 299792458 seconds • kilogram : Standard cylinder of Pl-Iridium alloy at room temperature • second : Cs-133 atomic clock – time for 9192631770 wave cycles to occur

  7. Conversion of Units 1 meter = 100 centimeter = 1000 millimeter (mm) 103 meter = 1000 meters = 1 kilometer 0.001 meter = 10-3 meter = 1 millimeter 3.281 feet = 1 meter 5280 feet = 1 mile 3600 seconds = 1 hour 0.65 miles / hour = 95 feet / second = 29 meters / second

  8. Significant Figures Keep the same number of significant figures in the answer as in the least accurate number 3.5 × 10.6 = 37 (not 37.1) 0 ± 0.1 0 ± 0.1 35 39 Uncertainty : Quality of the apparatus Skill of the experimenter Number of measurements

  9. Dimensional Analysis • Distance - [L] •        Mass - [M] •        Time - [T] • Check whether an equation is mathematically correct • Find an unknown exponent

  10. Vectors and Scalars • Addition and subtraction •        Multiplying by a number •       Components • Vector addition by Components • Vector addition by Graphing

  11. Vector Addition • (Due East) Resultant Displacement R = A+ B • Due East and then Due north R = A +B 5 = 4 +3 ? Find Theta

  12. What if Vectors are not Perpendicular ? Can we say R = A +B ? But Pythagorean Theorem valid ? Graphical Technique A = 275 m, B =125 m Scale 1 cm = 10 m R = 228 m

  13. Vector Components r = X + Y r  A, X Ax Y AY

  14. Different Axes Vector Components depend on the orientation of the axes Scalar components (With positive or negative sign)

  15. Adding Vectors Using Components C = A +B, C = Cx + CY A = Ax +Ay CX = B = Bx + By CY =

  16. y y y 35 BX By AX AX B B B A A A Ay Ay R R R 20 20 x x x Example 8 A+B=R A=Ax+Ay B=Bx+By Note By is in negative direction.

  17. Example 8 (continued)

  18. Example 8 (continued)

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