Astronomy 115 - Lecture Notes Feb 26 (Chapter 4)
Astronomy 115 - Lecture Notes Feb 26 (Chapter 4) ASTR 115
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This 2 page Class Notes was uploaded by Eva Malek on Sunday March 1, 2015. The Class Notes belongs to ASTR 115 at San Francisco State University taught by Julio Magalhaes in Spring2015. Since its upload, it has received 57 views. For similar materials see Intro to Astronomy in Astronomy at San Francisco State University.
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Date Created: 03/01/15
Astronomy 115 Lecture Notes 226 Chapter 4 1 Making Sense of Motion in the Universe Describing Motion 0 Speed distance time rate at which an object moves 0 Velocity speed and distance example 10km gr due East 0 Acceleration Change of speed time rate of change of velocity 9Acceleration due to Earth s gravity all falling objects accelerate at the same rate 0 g gravity 98 ms2 speed increases around 10 m 52 for every second falling Galileo s Experiment on Acceleration of Gravity Galileo First scientist who used measurements and experiments to understand nature Dripping different sized objects from Tower of Pisa Objects fall at the same time 9 understand motion 1971 Apollo 15 Astronauts perform same experiment on our airless Moon 2 Changing the Motion of Objects Interaction between objects Force A push or a pull that an object exerts on another object Requires for a change in motion Net force Momentum Mass x velocity Net forces change momentum 9Linear momentum objects moving in a straight line 9Angular momentum rotational momentum of a spinning or orbiting object Mass versus Weight hdass Amount of matter in an object Kilograms Mass is the more basic quantity that affects motion The force of gravity pulling on an object Force pounds newton Weight is proportional to mass Acceleration of gravity on Mars 13 of Earth s 3m s2 Objects in Mars mass would be the same weight would be 13 3 Newton s Laws of Motion Building on Galileo s ideas l Law 1 The Law of Inertia l quotThought Experimentquot What is the natural statequot of motion of an object 9An object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless it experiences a net external force l Law 2 The Force Law l Fm a net forcemass x acceleration l Law 3 The Interaction Law l Whenever an object exerts a force on a second object the second object exerts an equal and opposite force on the first Forces an interaction between objects Action Forces example tennis racket Reaction Force example tennis ball Friction The motion of a car Tire pushes on Earth Earth pushes back
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