PHYS 1023 Lecture 4: Chapter 4
24 Aug 2016
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Chapter 4: why things move as they do. Force: force external in uence that can cause a body to accelerate. Force is an action not a thing (verb) An object can"t be a force or posses a force: a force must be caused by something and received by something, examples. Falling again: falling object accelerates, implies something is exerting a force. Falling object is receiving the force: gravity is a special force. Force and acceleration: newton"s theory of motion: forces cause acceleration. Acceleration is a change in velocity: gravity accelerate a falling object. Thursday, january 28, 2016: newton formulated a relationship. Tap on a ball momentary acceleration. Tap harder goes faster, more acceleration. Acceleration and force: apply force get acceleration, double the force, double the acceleration. Weight vs. inertia: apply some tap to bowling ball and a ping pong ball. Bowling ball has more inertia, its velocity changes the least: on earth, weight and inertia seem to be the same.
