Ch6_ChiavelliJ

=Chapter 6 Wiki = toc

**Lesson 1: Notes** a. //**Let's Get to Work **//
 * Work- **when a force acts upon an object to cause a displacement of the object, work has been done upon the object

3 Pronged Components- - force (cause displacement) - displacement - cause

 The angle theta is specifically the angle between the force and the displacement   Whenever F and d are in the same direction, theta is 0 degrees

<span style="font-family: 'Times New Roman',Times,serif;">Negative work is when a force acts upon an object to hinder displacement, as such the force acts in the direction opposite the objects motion in order to slow it down (DOES NOT CAUSE DISPLACEMENT, BUT HINDERS IT)

<span style="font-family: 'Times New Roman',Times,serif;">The Joule is the unit of work (1J=1N*1m)

<span style="font-family: 'Times New Roman',Times,serif;">Any unit of force times any unit of displacement is equivalent to a unit of work

=<span style="font-family: 'Times New Roman',Times,serif;">Lesson 2 = <span style="font-family: 'Times New Roman',Times,serif;">a.

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">External forces include applied, normal, tension, friction, and air resistance (nonconservative forces)
 * //<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">Classifying Internal v. External Forces //**

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">Internal forces include gravity, magnetic, electrical, and spring (conservative forces)

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">When net work is done upon an object by an external force, the total mechanical energu (KE + PE) is changed

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">Positive work means a gain in energy, while negative work means a loss in energy (and can be in KE or PE form)

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">Work equals the change in mechanical energy

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">When the net work upon an object is solely being acted by an internal force, total mechanical energy (KE +PE) remains constant

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">Instead, energy changes form and the total amount of mechanical energy is conserved

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">Practice Problem Assessment: Although I struggled at first with the examples, patterns and key concepts emerged enabling myself to better grasp the material.

=<span style="font-family: 'Times New Roman',Times,serif;">Electric Bill Analysis =

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">**Sample Calculations:**

<span style="font-family: 'Times New Roman',Times,serif; font-size: 110%;">The cost of kWh are different on the data table above and the actual values because electric companies charge consumers differently per a variety of consumption/rate combinations. The simple calculations above do not account for PSEG price fluctuations. In my opinion, the cost of electricity is very reasonable. Compared to the cost of other bills and payments, and considering today's modern world, electricity is an invaluable asset at a very sound price. Although the 10 appliances I chose do not reflect the electric bill in its entirety, I believe the total cost is reasonable factoring in home and family size. The major change I would make in order to lower the monthly payment would be to turn off lights and appliances when not in use.