Chapter 5

Notes

Chapter 5 Force and Motion I Chapter Goal: To establish a connection between force and motion. 1 Newton’s First and Second Laws ➢We know how to describe motion (kinematics) using motion diagrams, graphs, and kinematic equations. ➢This chapter begins our study of dynamics—the causes of change in motion. Ch. 5.1 2 Newton’s First and Second Laws For a locomotive to pull the first car behind it up a steep hill at constant velocity, which of the following statements must be true? Guess now! a) There are no forces acting on the car. b) There is only one force acting on the car. c) “Forward” forces must be greater than “backward” forces. d) There are multiple forces acting on the car however they cancel each other out. e) None of the above. 3 Ch. 5.1 Newton’s First and Second Laws Ch. 5.1 4 Newton’s First and Second Laws What do Forces Do? Aristotle thought forces made things move because when you remove the force, the thing always stops moving. Ch. 5.1 Ԧ 𝐹 𝑎𝑝𝑝𝑙𝑖𝑒𝑑 𝑏𝑦 ℎ𝑎𝑛𝑑𝑠 Ԧ 𝑣 = 0 Ԧ 𝑣 Ԧ 𝑣 5 Newton’s First and Second Laws What Causes Motion? Consider this thought experiment. ➢Give a child the same push on different surfaces. Ch. 5.1 6 Newton’s First and Second Laws ...