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Physics Chapter 5 summary

by: Jennifer Notetaker

Physics Chapter 5 summary PHYS2070

Jennifer Notetaker
GPA 3.0
General Physics I
Dr. Scott Lee

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About this Document

This chapter discusses Energy.
General Physics I
Dr. Scott Lee
Class Notes
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This 2 page Class Notes was uploaded by Jennifer Notetaker on Sunday September 27, 2015. The Class Notes belongs to PHYS2070 at University of Toledo taught by Dr. Scott Lee in Summer 2015. Since its upload, it has received 35 views. For similar materials see General Physics I in Natural Sciences and Mathematics at University of Toledo.

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Date Created: 09/27/15
Physics Summary 5 In this chapter we talked about Energy Energy is the capacity to do work There are various types of energy There is Mechanical energy Mechanical of an object can be the result of its motion ie kinetic energy andor the result of its stored energy of position ie potential energy The total amount of mechanical energy is the sum of the potential energy and the kinetic energy Chemical energy is energy stored in bonds chemical energy can be released in during chemical reactions Electromagnetic energy is a form of energy that is re ected or emitted from objects in the form of electrical and magnetic waves that can travel through space Types of electromagnetic waves include Gamma rays X rays micro waves ultraviolet radiation and infrared Nuclear energy This is the energy released by the nucleus of an atom as the result of nuclear ssion nuclear fusion or radioactive decay Newton s second law states that energy can neither be created nor destroyed but transformed from one form to another this means that the amount of energy in the world can never change The chapter goes on and discusses the meaning of work Work is done when a force that is applied to an object moves that object displaces the object The work is calculated by multiplying the force by the amount of movement of an object W F d Work gives a connection between force and energy The equation of Work only occurs when force is direction as the displacement Work is a scalar quantity and the SI unit for work is Newton meter which is Joules J work can be positive or negative it is positive when both force and displacement are in the same direction and negative if wok and displacement are in opposite directions Note that when the force of an object is perpendicular to the displacement of the object then the work done by force is zero 0 and also when there are many forces acting 0 an object then the total work done is the sum of the amount of work achieved by each force Work cannot occur on its own it must be done by something in the environment on the said object The chapter later goes on and talks about work and dissipative forces such as friction Work can be done by friction Friction processes on mechanical energy alone The energy lost to friction by an object goes into heating both the object and its environment Kinetic energy This is energy that is associated with motion of an object It is a scalar quantity having the same unit as work and hence can be said to be related to work Kinetic energy KE half the mass of the object in motion times its velocity squared 12 mvquot2 Work done is equal to the change in its objects kinetic energy when work is done by a net force on an object and the only change in the object is the speed ie speed is directly proportional to work If work is positive than speed increases and if work is negative then speed decreases Types of forces include Conservative force and Nonconservative force Conservative force is when work and energy identi ed with the force an be recovered where as Nonconservative force is when the force 5 are dissipative and the work done against it cannot easily be recovered Potential energy is the energy that an object has due to its position in a force eld or that a system has due to the con guration of its parts Gravitational Potential Energy is the energy associated with the relative position of an object in space near the Earth s surface


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