45111-Chapter2_lecture_notes - Chapter 2 Motion in one dimension 2.1 Describing motion 2.2 Uniform motion 2.3 Instantaneous velocity 2.4 Acceleration

45111-Chapter2_lecture_notes - Chapter 2 Motion in one...

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Chapter 2 Motion in one dimension 2.1 Describing motion 2.2 Uniform motion 2.3 Instantaneous velocity 2.4 Acceleration 2.5 Motion with constant acceleration 2.6 Solving one-dimensional motion problems 2.7 Free fall 1
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2.1 Describing motion To begin the description of an object’s position, you have to : choose a coordinate system (direction and units) make a drawing (particle model) position Example: motion diagram (student walking to school) To complete the description of an object’s position, you can: make a table of data (optional, not necessary) make a position-versus-time graph 2
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From the particle model to a continuous curve: a graph is not a drawing a graph is an abstract representation of motion velocity can be deduced from a position-vs-time graph position can be deduced from a velocity-vs-time graph 3
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Velocity is a vector: a magnitude (units). a direction (with respect to a coordinate system). dimension of velocity (and speed): LT -1 . units of velocity (and speed): m/s, mi/hr, km/hr, …. Velocity: a vector O y j v 1 v 2 An object is moving with velocity v 1 . Another object is moving with velocity v 2 . 4
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