Chapter 1 Introduction What is physics n Structure

Chapter 1 Introduction What is physics? n. Structure of Course n n Website, Homework, Labs, Notebooks, Tests Measurement n. Unit Conversions n. Problem Solving Strategies Homework: 1 st day lesson 10, 12, 13 n

What is Physics? n A search for patterns, or rules, for the behavior of objects n n n From atoms to galaxies From the primordial fireball to the ultimate fate World view

n Major areas of Physics n n Mechanics Thermodynamics Electromagnetism Relativity Quantum Mechanics

The Course n Behavior : Cell phone Free Zone! Hats n n n Attendance Opening Activities n n n Presentations posted on wiki tinyurl. com/marentette-wiki Notebook n n Story Problems on screen or in note packet collected each day Homework n n Other-wise: acting wisely with others in mind! Sections - Labs! Lab Reports Tests n n n 2 Take Home Assignments Foldables Review Test all multiple choice n Make-up and Late Work n Review Sessions 3 rd trimesters n AP Physics 1 - Semester Elective Science Credit

Tinyurl. com/marentette-wiki

The Course n Mechanics! n Motion n One/two dimensions (graphs) n Newton’s Laws n Work and energy n Momentum and Collisions n Rotational Motion and Gravitation n Rotational Dynamics

Learning to Read First Grade n Learning to Read n Naming weird little squiggles. (now even Greek!) n Differentiate between a b from a d from a p. n Sounds for each letter even though some letters have multiple sounds, and multiple letters have the same sound (capitals)

Learning to Read First Grade n n Then one day …. Your world Changed!!

n If this course works, you will become aware of a whole world you never noticed before. n There are times when you will have to memorize what symbols mean. n There will be times when you will confuse things that seem as much alike as b, d, and p once did. n And there will be times when you will look at a combination of events and equations in total frustration. So, welcome to one of the most challenging (and rewarding) courses you have ever taken in your life. If you work at it and let it happen, this experience will change your world view forever.

Systems of Measurements n n The two dominant systems are the U. S. customary system, and the metric system Thomas Jefferson advocated that the United States adopt the metric system, but his advice was not taken. It is used, however, by the scientific community. n The United States is the only major country not to have made the change.

Systems of Measurements n n The metric system has advantages over the U. S. customary system and was the system chosen in 1960 by the General Conference on Weights and Measures. The official version is known as Le Système International d’Unités and is abbreviated SI. Length n n Mass n n Defined in terms of a meter -- the distance traveled by light in a vacuum during a given time Defined in terms of kilogram, based on a specific cylinder kept at the International Bureau of Standards Time n Defined in terms of the oscillation of radiation from a cesium atom

A meter is about the same length as a. b. c. d. a mile. a yard a foot. an inch. B

Metric System n Length n n Mass n n 6 km 6 kg Time n 6 ks

A Metric Riddle Measurements n What are 10− 12 boo, 10− 3 pede, and 1012 dactyl? Answer: A picoboo (peek-a-boo), a millipede, and a teradactyl (pterodactyl). ?

Know: Systems of Measurements n 1 Mm=106 meters 1 km = 103 meters 1 cm = 10 -2 meter 1 mm =10 -3 meter 1 mm = 10 -6 meter 1 nm = 10 -9 meter 1 pm=10 -12 meter 1 hour= 3600 seconds 365 days = 1 year Fraction method…. Goal is to eliminate units n Great for multiple step conversions (land speed record)

Which expression correctly converts 60 km/hour to meters per second? a. b. c. d. c

The Metric System Measurements Know: 1 Mm=106 meters 1 km = 103 meters 1 cm = 10 -2 meter 1 mm =10 -3 meter 1 mm = 10 -6 meter 1 nm = 10 -9 meter 1 pm=10 -12 meter 1 hour= 3600 seconds 365 days = 1 year Multiply method works great within SI system 6 km = 6 x 103 m 6 kg= 6 x 103 g 12 ms=12 x 10 -3 s

Trigonometry n Pythagorean Theorem n C 2=a 2+b 2

Significant Figures n n n A significant figure is one that is reliably known In a measurement, the significant figures include the first estimated digit Write 3 to 4 numbers for your answers

Successful Physics Learners: n n n Read your class notes each night Read the story problem Use Solid conceptual understanding: seeing a big picture n Draw a picture or diagram of the situation n Visualize what happens n Identify principle (heading) n list the givens

Successful Physics Learners n Apply physics concept to different situations n Choose equation (from assigned reading or summary at end of chapter) n Could be two equations two unknowns, don’t be afraid to list multiple equations and substitute givens n Use prior knowledge n Unit Conversions n 365 days in a year n Basic trigonometry n Pythagorean theorem n Algebra

Successful Physics Learners Use multiple approaches to attack problems n Use prior knowledge Check to see if the answer is reasonable n are the units correct for the quantity being found? n n check order of magnitude are signs appropriate and meaningful?

Physics Learning n n n Use multiple resources: notes, book, homework, opening activities, etc… Work in groups to clarify concepts and their relationships Go beyond symbolic manipulation: plugging in #’s isn’t physics! Do not memorize: learn when & why things work and when they don’t Use tinyurl. com/marentette-wiki for student presentations Actively participate!

Novice versus Expert Physics Learner n n Novices see physics problems as object related Experts see physics problems as concept based