Chapter 1 Notes - Introduction Physical Modeling...

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1 PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Physical Modeling Concepts: Why study Physics Measurement Significant Figure Uncertainty Order of magnitude Estimation PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Why study Physics? Physics is the foundation of every science (astronomy, biology, chemistry…). Is this a true statements? Whether you study biology, architecture, music, medicine, chemistry or art, there are principles of physics that are relevant to your field. Is this a true statements? PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction What is Physics? –Physics is the study of the fundamental laws of nature. – Physics describes matter, energy, space, and time. Physics is the activity of trying to find the rules by which nature plays. PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Application of Physics: –Physics contributes directly to other branches of science, such as: •Chemistry: deals with the interactions of molecules and atoms •Architecture: deals with structural stability, acoustics, heating, lighting and cooling of buildings. PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Application of Physics: –In biology and medicine, such as: • Membrane (as the boundaries of living cells) properties • Heat and energy associated with the body –Medical diagnostic and medical therapy PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction An Example of Biophysical System: –Human Heart: a multicellular organs, producing a cyclic process necessary for life • Cardiac muscle cells are not replaced and do not divide • These permanent cells contract roughly three billion times in a typical life, circulating blood through the body.
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2 PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Human Heart Some Questions: – How does the heart act as a pump? – What are the electric and chemical interactions that control the heartbeat and keep the heart functioning in a coherent manner? – What is the ultimate mechanism by which cardiac muscle generates the contracting force needed to pump blood to the lungs and the body? – What are the properties of the blood and of the circulatory system external to the heart that have an impact on the heart’s functioning? PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Structure of Matter High Energy Physics 10 -10 m 10 -14 m 10 -15 m <10 -18 m 10 -9 m Matter Molecule Atom Nucleus u Quark <10 -19 m protons, neutrons, mesons, etc. π,Ω,Λ... top, bottom, charm, strange, up, down Condensed matter/Nano-Science/Chemistry Atomic Physics Nuclear Physics Baryon (Hadron) Electron (Lepton) 10 -2 m PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Periodic Table of the Elements PHYS 1L03, Winter 2010, McMaster University, R.Nejat Introduction Studying Physics: –will help you develop good thinking skills and good problem solving skills In some way learning physics may seems much simpler than learning biology or chemistry.
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