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Unformatted text preview: Lecture 4 Chapter 2: Motion in one dimension Last Time • Finished chapter 1 Scalars Vectors Addition Subtraction Multiplication of a vector by a scalar Multiplication of two vectors Vector Components • Chap 1 HW solutions are posted Motion • Chapter 2 will focus on motion in 1 dimension Describe motion using concepts of space and time – kinematics Ex. Driving • Any description of motion involves three concepts: Displacement Velocity Acceleration Displacement • Nearly the frst thing you must do in every physics problem is defne a coordinate system • For one dimensional motion, Choose an origin Choose a positive direction +x O Displacement • x is defned as the position compared to the origin • Displacement, Δ x, is the di f erence between two positions • Δ x = x 2x 1 or Δ x = x Fx i • Distance, d, is the total length traveled. d can only be a positive value (not a vector) Note: Particle Description • Motion of an object through space can be quite complicated… Friction Internal Motion Rotation • Use a simpli¡ed model Particle model Details that are not that signi¡cant in determining the outcome of the problem are ignored PositionTime Graph The positiontime graph shows the motion of the particle (car) The smooth curve is a guess as to what happened between the data points 2D Variables...
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This note was uploaded on 01/25/2012 for the course EE ee taught by Professor E during the Spring '11 term at UCSD.
 Spring '11
 e

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