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Lecture 4

# Lecture 4 - Lecture 4 pls-4.1 The Language of Motion Media...

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Lecture 4 pls-4.1 The Language of Motion Media: 1. Cart and track 2. Tennis ball 1. Key Kinematics Concepts The subject of kinematics consists of the concepts of time t assumed to progress at the same rate for all observers position ( ) t r r ( ( ) t x r or ( ) t y r for 1D motion) ( ) t x = scalar component along x axis ( ) t y = scalar component along y axis velocity ( ) t v r ( ) t v x = scalar component along x axis ( ) t v y = scalar component along y axis acceleration ( ) t a r ( ) t a x = scalar component along x axis ( ) t a y = scalar component along y axis and the (mathematical) relationships between them. Often we are ultimately interested in position ( ) t r r . Unfortunately, Newton’s 2 nd law directly relates forces to acceleration ( ) t a r , and finding ( ) t r r from ( ) t a r is often a hard problem. We will deal with this later. We first concentrate on understanding position, velocity, and acceleration so that we can precisely describe motion itself.

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Lecture 4 pls-4.2 2. 1 Dimensional Motion 1 Dimensional (1D) : motion occurs along a straight line . Why study 1D motion? i. Because its description is simple.
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Lecture 4 - Lecture 4 pls-4.1 The Language of Motion Media...

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