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chapter4_151

# Essentials of College Physics (with CengageNOW 2-Semester and Personal Tutor Printed Access Card)

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Homework #2 Chapter 4 Conceptual: # 6 Problems: 16,20,28,34,42 Chapter 5 Conceptual: # 8 Problems: Exercise 5.1 – 5.10 (Exercises under each  examples) Chapter 6 Conceptual: # 6 Problems: Problems: Exercise 6.1 – 6.7 (Exercises under  each examples)

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Chapter 4 The Laws of Motion
Classical Mechanics Describes the relationship between the  motion of objects in our everyday world and  the forces acting on them Conditions when Classical Mechanics does  not apply very tiny objects (< atomic sizes) objects moving near the speed of light

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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

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Mass A measure of the resistance of an  object to changes in its motion due to a  force Scalar quantity SI units are kg
The acceleration of an object is directly  proportional to the net force acting on it and  inversely proportional to its mass.

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chapter4_151 - Homework#2 Chapter4 Chapter5 Conceptual#6...

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