L04a - 1 / 15 Physics 111 Lecture 4a We live in a Newtonian...

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Unformatted text preview: 1 / 15 Physics 111 Lecture 4a We live in a Newtonian world of Einsteinian physics ruled by Frankenstein logic. David Russell Forces Forces First Law Inertia 2nd Law Question Example 2nd Law Question 3rd Question 2 / 15 Kinematics: Description of motion in terms of space, time, velocity and acceleration Dynamics: Relation of motion and its cause Dynamics is based on Newtons laws of motion and requires the introduction of two new physical quantities: Force and mass Forces are pushes or pulls that may or may not affect the motion of an object Forces are vectors (magnitude and direction) Forces Forces First Law Inertia 2nd Law Question Example 2nd Law Question 3rd Question 3 / 15 We usually think of forces as occurring between two objects that are in contact with one another Contact forces Pushing on the wall Kicking a ball Opening a door But this is not always the case. For example, gravity is a force that occurs between two objects not in contact Field forces Gravity (ball up in the air) Electric force Magnetic force Forces Forces First Law Inertia 2nd Law Question Example 2nd Law Question 3rd Question 4 / 15 All forces in the universe can be broken down to four fundamental forces: Strong nuclear force Electromagnetic force Weak nuclear force Gravitational force Example: Pushing and the electrical force First Law Forces First Law Inertia 2nd Law Question Example 2nd Law Question 3rd Question 5 / 15 Sir Isaac Newton was the first one to introduce the idea of forces to explain the motion of objects He came up with three important laws that govern how...
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This note was uploaded on 04/22/2008 for the course PHYS 111 taught by Professor Madrid during the Winter '08 term at Ohio State.

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L04a - 1 / 15 Physics 111 Lecture 4a We live in a Newtonian...

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