Physics 101: Lecture 20, Pg 1 Lecture 20: Ideal Spring and Simple Harmonic Motion l Chapter 9: Example Problems l New Material: Textbook Chapters 10.1 and 10.2

Physics 101: Lecture 20, Pg 2 Ideal Springs l Hooke’s Law: l Hooke’s Law: The force exerted by a spring is proportional to the distance the spring is stretched or compressed from its relaxed position. è F X = -k xWhere x is the displacement from the relaxed position and k is the constant of proportionality. (often called “spring constant”) relaxed position F X = 0 x x=0

Physics 101: Lecture 20, Pg 3 Ideal Springs Ideal Springs l Hooke’s Law: l Hooke’s Law: The force exerted by a spring is proportional to the distance the spring is stretched or compressed from its relaxed position. è F X = -k xWhere x is the displacement from the relaxed position and k is the constant of proportionality. (often called “spring constant”) relaxed position F X = -kx > 0 x x  0 x=0

Physics 101: Lecture 20, Pg 4 Ideal Springs l Hooke’s Law: l Hooke’s Law: The force exerted by a spring is proportional to the distance the spring is stretched or compressed from its relaxed position. è F X = -k xWhere x is the displacement from the relaxed position and k is the constant of proportionality. (often called “spring constant”) F X = - kx < 0 x x > 0 relaxed position x=0