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## Introduction to Physics Physics 175

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**What is Physics?**• See order and rules • Learn how things work • Become more informed to make decisions • Use critical thinking**What to expect from this course:**• Not heavy math • Overview of Physics and it’s principles • Not covering the entire book in order • Ask questions!! • Bring in ideas, examples, questions, etc • Work together**Scientific Method**• Observation • Hypothesis • Experiment • Modification and further experiment • Theory or law Engage your brain!! Breathing experiment**Metrics (page 9 or the inside back cover of your book)**3 m = ______km 5 l = ______ml 15 km = _______ m**Two step problems:**30 cm = _____ mm 0.0015 km = _____ cm 45,000 mm = ______ km**English to metric conversions:**15 in = ______ cm 1 km = ______ ft 100 m = ______ miles 1 year = ______ seconds**Measure your height in inches.**Convert to meters. Measure again in meters and compare.**Frequency (f) is the number of occurrences per time period.**It is measured in cycles per second, or Hertz (Hz). Period (T) is the time it takes for one occurrence. It is measured in seconds. T = 1/f**Vectors and ScalersA vector quantity contains a magnitude**(number value) and a direction. An example is 22 mi/hr North.A scaler quantity contains only the magnitude, no direction. An example is 15 feet.**Vector Addition**• Always draw vector diagrams head to tail. • Components are drawn to define the resultant.**Does order matter?**Start on 10, 16 6 squares up 8 squares right 4 squares down 2 squares right 9 squares up 14 squares left 10 squares down 3 squares left**Velocity and Speed**• Velocity = distance traveled/time • Average speed is the speed calculated over an entire trip • Instantaneous speed is the speed at a particular point in time • Velocity is a vector and speed is a scaler • Units are meters/second in the metric system**Greek as shorthand**The Greek letter delta (Δ) is used to mean “change in.” The velocity equation is often written as V = Δd/Δt αβγδεζηθικλμνξοπρςστυφχψω αβγδεζηθικλμνξοπρςστυφχψω**What is the speed (in m/s) of a car traveling 40 km in ½**hour?**Relative speed and frame of reference**Frame of reference is a coordinate system for specifying the precise location of objects in space.**Absolute speed limit**• The speed of light is the upper limit for speed. It is the same in every frame of reference. • C = 3 x 108 m/s or 186,000 miles per second