phy2048_ch2

phy2048_ch2 - Physics for Scientists and Engineers I PHY...

This preview shows pages 1–10. Sign up to view the full content.

Physics for Scientists and Engineers I Dr. Beatriz Roldán Cuenya University of Central Florida, Physics Department, Orlando, FL PHY 2048, Section 4

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Chapter 1 - Introduction I. General II. International System of Units III. Conversion of units IV. Dimensional Analysis V. Problem Solving Strategies
I. Objectives of Physics - Find the limited number of fundamental laws that govern natural phenomena. - Use these laws to develop theories that can predict the results of future experiments. -Express the laws in the language of mathematics. - Physics is divided into six major areas: 1. Classical Mechanics (PHY2048) 2. Relativity 3. Thermodynamics 4. Electromagnetism (PHY2049) 5. Optics (PHY2049) 6. Quantum Mechanics

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
II. International System of Units K Kelvin Temperature W = J/s Watt Power J = Nm Joule Energy Pa = N/m 2 Pascal Pressure N Newton Force m/s 2 Acceleration m/s Speed kg kilogram Mass s second Time m meter Length UNIT SYMBOL UNIT NAME QUANTITY f femto 10 -15 p pico 10 -12 n nano 10 -9 μ micro 10 -6 m milli 10 -3 c centi 10 -2 D deci 10 -1 da deka 10 1 h hecto 10 2 k kilo 10 3 M mega 10 6 G giga 10 9 T tera 10 12 P peta 10 15 ABBREVIATION PREFIX POWER
Example: 316 feet/h Æ m/s III. Conversion of units Chain-link conversion method: The original data are multiplied successively by conversion factors written as unity. Units can be treated like algebraic quantities that can cancel each other out. IV. Dimensional Analysis Dimension of a quantity: indicates the type of quantity it is; length [L], mass [M], time [T] Example: x=x 0 +v 0 t+at 2 /2 s m feet m s h h feet / 027 . 0 281 . 3 1 3600 1 316 = [] [] [ ] [] [ ] [ ] [] [] [] L L L T T L T T L L L + + = + + = 2 2 Dimensional consistency: both sides of the equation must have the same dimensions. Note: There are no dimensions for the constant (1/2)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Significant figure Æ one that is reliably known. Zeros may or may not be significant: - Those used to position the decimal point are not significant. - To remove ambiguity, use scientific notation. Ex: 2.56 m/s has 3 significant figures, 2 decimal places. 0.000256 m/s has 3 significant figures and 6 decimal places. 10.0 m has 3 significant figures. 1500 m is ambiguous Æ 1.5 x 10 3 (2 figures), 1.50 x 10 3 (3 fig.) Order of magnitude Æ the power of 10 that applies.
V. Problem solving tactics • Explain the problem with your own words. • Make a good picture describing the problem. • Write down the given data with their units. Convert all data into S.I. system. • Identify the unknowns. • Find the connections between the unknowns and the data. • Write the physical equations that can be applied to the problem. • Solve those equations. • Always include units for every quantity. Carry the units through the entire calculation. • Check if the values obtained are reasonable Æ order of magnitude and units.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Chapter 2 - Motion along a straight line I. Position and displacement II. Velocity III. Acceleration IV. Motion in one dimension with constant acceleration V. Free fall MECHANICS Æ Kinematics Particle: point-like object that has a mass but infinitesimal size.
I. Position and displacement

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/30/2011 for the course PHY 2049 taught by Professor Saha during the Spring '08 term at University of Central Florida.

Page1 / 28

phy2048_ch2 - Physics for Scientists and Engineers I PHY...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online