Lecture4

# Lecture4 - Lecture 4 Chapter 2 Motion in one dimension Last...

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Lecture 4 Chapter 2: Motion in one dimension

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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

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Displacement Nearly the first thing you must do in every physics problem is define a coordinate system For one dimensional motion, Choose an origin Choose a positive direction +x O
Displacement x is defined as the position compared to the origin Displacement, Δ x, is the di ff erence between two positions Δ x = x 2 -x 1 or Δ x = x f -x i Distance, d, is the total length traveled. d can only be a positive value (not a vector)

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Note: Particle Description Motion of an object through space can be quite complicated… Friction Internal Motion Rotation Use a simplified model Particle model Details that are not that significant in determining the outcome of the problem are ignored
Position-Time Graph The position-time graph shows the motion of the particle (car) The smooth curve is a guess as to what happened between the data points

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