# Chapter 4 - Chapter 4 The Laws of Motion Forces Usually...

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Chapter 4 The Laws of Motion

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Forces Usually think of a force as a push or pull Vector quantity May be a contact force or a field force Contact forces result from physical contact between two objects Field forces act between disconnected objects Also called “action at a distance”
Contact and Field Forces

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Fundamental Forces Types Strong nuclear force Electromagnetic force Weak nuclear force Gravity Characteristics All field forces Listed in order of decreasing strength Only gravity and electromagnetic in mechanics
Newton’s First Law An object moves with a velocity that is constant in magnitude and direction, unless acted on by a nonzero net force The net force is defined as the vector sum of all the external forces exerted on the object

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External and Internal Forces External force Any force that results from the interaction between the object and its environment Internal forces Forces that originate within the object itself They cannot change the object’s velocity
Inertia Is the tendency of an object to continue in its original motion Mass A measure of the resistance of an object to changes in its motion due to a force Scalar quantity SI units are kg

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The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. F
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## This note was uploaded on 04/16/2008 for the course PHY 1603 taught by Professor Boudreaux during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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Chapter 4 - Chapter 4 The Laws of Motion Forces Usually...

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