1. Ch 1 Homework – due Sept 14 5 th Edition – Ch 1 Section 3,4,5,6 Questions: 5,9 Problems: 1-4, 8,9, 12,13, 18 General Problems: 33 More info: Ch 29-1, Ch 27-1, Ch 32 7 th Edition Questions: 2,5 Problems: 1-4, 7, 8,12,13, 16 More info: Ch 29-1, Ch 27-1, Ch 32

2. Objects and Systems Notes 9 Sept 2015

3. Vocabulary  Model – a conceptual, mathematical or pictorial analogy or mental image created to simplify and make understandable a phenomenon, can lead to theories  Ex: Modeling light as traveling like water waves  Theory – a broad and detailed approach that provides testable predictions and comes from multiple experimental outcomes  Ex: Wave theory of light Theory of Gravity

4.  Law – Concise but general statements about how nature behaves  Ex: Law of reflection applies to light, sound, water, etc Law of Gravity  Principle – like a law, but even more general  Ex: Heisenberg Uncertainty Principle

5.  Explanations – basically hypotheses that have been experimentally tested and are used to make predictions and answer scientific questions  Claims – an answer to a question from direct and simple evidence

6.  Evidence based claims – make claims and predictions based on data and following with reasoning based on theories, laws, prinicples and models  Evaluate and refine explanations, theories, models  Create models and representations to communicate and explain phenomena (i.e. graphs, diagrams) Skills

7.  1. Create a representation or model of cars rolling down ramps of different angles  2. Make an evidence based claim from this data set Practice Problems Angle of RampDistance car travels from bottom 20°1.1m 30°1.6m 40°1.8m 50°0.5m

8. Objects vs System  Objects and systems have properties such as mass and charge. Systems may have internal structure. Big Idea 1  Objects – have no internal structure or the internal structure doesn’t affect properties (figure b)  Systems – have internal structure that affects the properties and behavior (figure a)  Modeling something as an object or a system is a fundamental step in describing and analyzing a physical situation

9.  3. Object or system? Practice Problems A B C D E F

10. Structure of Matter (chemistry background assumed)  Matter builds from fundamental particles which are objects up to systems like nuclei, atoms, molecules and macroscopic objects  Fundamental particles have no internal structure  Treated as objects  Electrons, neutrinos and other leptons  Quarks  Protons and Neutrons have internal structure and are composed quarks  Treated as objects or systems  Electric charge is a result of quark composition