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Intellectual Guide to Physics

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Exam 1: Study Guide

09/23/15

What Is Science?
• Scientific theories and scientific laws: attributes, similarities, differences • Scientific hypotheses: what qualities set scientific hypotheses apart from ordinary hypotheses? (one quality contains a “must”, four others contain “should”)
• Scientific method as an ongoing process: refer to the guide http://idea.ucr.edu/documents/flash/scientific_method/story.htm Precision, Accuracy, and Significant Figures
• Four cases: precise but not accurate, accurate but not precise, both precise and accurate, neither precise nor accurate; think “target practice” • Significant figures (example): mass = density × volume = 0.9957 g/cm3 × 20.0 cm3 = 19.914 g → rounded to 19.9 g (three sig figs) because this calculation involves a number with only three sig figs
(which is the lowest number of sig figs among the values being multiplied) Motion
• Position as a vector: an arrow from the origin (0, 0) to (x, y)

represents the position (x, y) as a vector; labeled “ r ”
• Vecolity as a vector: always in the direction of travel (except may be a bit off when using estimates such as backwards differences); also

 represented by an arrow; labeled “ v ”
• Acceleration as a vector: may have a component in the direction of travel (if speeding up) or € opposite the direction of travel (if slowing down), and/or a component perpendicular to the direction of travel (if

the direction of travel is changing); labeled “ a ” page 1 of 2



Exam 1: Study Guide

09/23/15

Forces
• First law of motion: an object’s motion remains constant (that is, its speed and direction of travel do not change) as long as the net (total) force acting on it is zero
• Second law of motion: acceleration is always in the direction of the net
(total) force acting on the object, and is proportional to that net force;

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