Even+More+Progress!


 * 1) === **Due Tuesday, May 31** ===

**//The wiki is for the rest of the class to learn from, so you need to do a good job //**
 * Your explanation must be **//well illustrated//** in some way. You may use illustrations obtained from the Internet (be sure to provide web link references), or something that you create yourselves. (Three illustrations per student).
 * Your work needs to be clear and organized.
 * The written work should include clear explanations, 100% in your own wording.
 * You need to list all references used at the end of your group's work.

What To Do:  1. Each team member needs to do the following:  2. Work to edit the writing that others have provided. You need to provide at least 3 significant edits. **Do not post any work that is not 100% in your own wording.**
 * You need to use your bulleted list to create sentences and paragraphs about your section.
 * Be sure to cover all the objectives on page 1.
 *  You need to include three relevant illustrations and include an explanation of your illustration in the written work that you post.
 * You must have a link to an activity and a video in your final copy, so add that if you haven't yet.
 * You may make small grammar and punctuation corrections, but these are not the primary focus here.
 * Instead, make real and substantial improvement editing changes that improve the organization and content significantly. You can add some additional researched material if you wish. Be careful to be polite in this process. Indicate what you did in the discussion area (a tab at the top of your wiki)
 *  Be sure that in all work that you do in this course, that you use entirely, **100%** your own wording. Using your own wording is very important as part of the learning process in this course.
 * <span style="font-family: arial,helvetica,sans-serif; font-size: 10pt; font-weight: normal;">As you make your postings, you need to list a working web page link for any locations that you use in getting your information or illustrations. Be sure to list the exact page that you read, not the overall homepage for a website. Also, be sure to write http:// just before the www web address.

<span style="font-family: arial,helvetica,sans-serif;">How You Will Be Evaluated: For __adding additional material__ about your own topics and for making __at least three substantial editing changes__ to other people's postings, you will receive 20 points total.

The six types of simple machines are a lever, a pulley, a wheel and axle, a simple inclined plane, a wedge, and a screw. The lever family While using a hammer it makes it easier to pull out a nail because it uses leverage. Levers are divided into three classes All levers have a rigid arm that turns around a point called the fulcrum. Examples of levers:a pair of pliers is mad of two first class levers, a second class lever is a nutcracker and a hinged door, examples of third class levers, the human forearm. || = Simple  = **Machines** [] Smachines.htm
 * Jordan || 2 || The six simple machines: lever, pulley, wheel and axle, inclined plane, wedge, screw. Key terms simple machines, and compound machines. Simple machine- one of the six basic types of machines, which are the basis for all other forms of machines. Compound machine- a machine made of more than one simple machine. There are three types of levers: first class levers have a fulcrum located between the points of application of the input and output forces; second class levers, the fulcrum is at one end of the arm and the input force is applied to the other end.The wheel of a wheelbarrow is a fulcrum. Third class levers; multiply distance rather than force. As a result, they have mechanical advantage of less than 1. The human body contains many third class levers. Using a simple machine makes work a lot easier because the amount of force you need to exert is lowered. Mechanical advantage of a lever: mechanical advantage= load/effort. Mechanical advantage of a pulley: mechanical advantage= load/number of ropes. Mechanical advantage of a inclined plane: mechanical advantage=length/height. Mechanical advantage of a wedge: mechanical advantage= length/thickness. Mechanical advantage of a wheel: mechanical advantage= wheel radius/axle radius. Mechanical advantage of a screw: mechanical advantage= number of screws/number of threads. Simple Machines

[] /simple-machines/glossary.htm

-[] examplesofmachines.html

[] phsicsintherealworld/p/ simplemachines.htm || [] [] [] ||

Section 3 <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">When an object has energy, it is able to do work. Work is done when an object changes it’s motion or position. Work is measured in joules. Since energy is a measurement of work, energy is also measured in joules. You cannot see an object having energy until it is transferred onto something else.

<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">One form of energy is Gravitational Potential Energy (GPE), which is the potential energy an object experiences because of gravity. Potential energy is stored energy. The more mass and the higher an object is, the more gravitational potential energy it has. <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">GPE= mass x free-fall acceleration x height



<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">Kinetic Energy is the energy that an object has when it is in motion. Kinetic Energy is calculated from speed and mass. The more mass and faster speed an object has, the more kinetic energy it has. <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">Kinetic Energy= 1/2 x mass x speed squared <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">Kinetic Energy depends more on speed than mass because the speed is squared in the equation.



<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">http://www.youtube.com/watch?v=Rn470XtSYK0

<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">All living things live from the energy that comes from the sun. Plants require the sun to conduct photosynthesis. Animals then eat the plants and receive the energy from the plants. Humans eat both plants and animals, so we get energy from both. The sun also keeps earth light and warm.

<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">When light energy travels through empty space, it is called electromagnetic waves. Light energy is separated by a spectrum, from red to blue. The blue end of the spectrum can better carry light energy than the red end.



<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">http://www.quia.com/rr/43884.html

<span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">Cheng, Johnny T.. "World of Waterfalls: Featured Articles: Why Do We Care About W aterfalls? . <span style="background-color: #ff921f; color: #ffffff; font-family: 'Comic Sans MS',cursive;">"World of Waterfalls: Info, Photos, Videos, & More About the World's Waterfalls!. N.p., n.d. Web. 25 May 2011. <span style="background-color: #ff921f; color: #ffffff; font-family: 'Comic Sans MS',cursive;">Dobson, Ken, John Holman, and Michael Roberts.Physical Science. Austin: Holt Rinehart and Winston, 2004. 391-399. Print. <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;"> "Electromagnetic Spectrum ." Web. 31 May 2011. <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">"Eureka! Episode 10 - Potential Energy." Youtube. Web. 31 May 2011. <span style="background-color: #ff9400; color: #ffffff; font-family: 'Comic Sans MS',cursive;">"Potential Energy." the Physics Classroom. Web. 31 May 2011.

= SECTION 4 =

__ E __ __ nergy transformations __

On a roller coaster going up, kinetic energy is used, but when the roller coaster reaches the top of the track the energy transforms and becomes potential energy, because it is going down.

__ Potential energy can become kinetic energy __

When the roller coaster is going down the hill, it starts to change form potential energy to kinetic energy, because once the car reaches the lowest point on the track it isn’t able to go any lower and kinetic energy kicks in so the car will continue up the hill (This is an illustration of when the rollar coasters car has potential energy and kinetic energy)

__ Kinetic energy can become potential energy __

Once the car reaches the top of the hill it starts to run out of kinetic energy and starts to turn into potential energy again, since it’s at the top of the hill the potential energy will carry it down. A car can’t climb a hill taller that the previous hill because it wouldn’t have enough kinetic energy built up. ( The ball gets thrown up in the air using kinetic energy and when it turns to go down it has a lot of potential energy.After that it has kinetic energy when going down.) __ Mechanical Energy can change to other forms of energy __

If changed from kinetic energy to potential energy were always complete then roller coasters would never stop and a ball would always bounce the same hight, but some energy is used to make the noise of a ball hitting the ground, or making the ball slightly warmer after hitting the surface of the ground. When these things happen they are called nonmechanical energy. Every time a ball bounces it loses some mechanical. When energy seems to have disappeared it has just changed to a nonmechanical form.

(The caption on this illustration says it all) __ The Law of Conservation of Energy __

In the Law of Conservation of Energy, energy can’t be created or destroyed. Energy can also not appear out of nowhere. So when it looks like energy just popped up, like when the energy in something increases, it’s because energy entered into the system from an outside force. Energy also doesn’t disappear. So when it looks like energy just disappeared, it’s didn’t it just changed form.

__ Systems may be open or closed __

A system with a pot of water on a burner could be getting very small amounts of energy from the lights in the room, or someone touching the pot, but it would be considered a closed system because all those little things can be ignored. But something like earth would be considered an open system because it gets energy from the sun and it radiates it’s own energy out into space

__ Not all work done by a machine is useful work. __

Friction and other factors make it so only some of the work that a machine does is actually doing what it’s meant to do. For example, using a pulley to lift a sail would be using a ton of extra energy in order to work against the friction of the rope, and the weight of the rope itself.

__ Efficiency __

A quantity (usually expressed as a percentage) that measures the ratio of useful work output to the useful work input is efficiency. The efficiency equation is useful work output divided by useful work input.If a machine is 100% efficient then the work input would be the exact amount of the work done, but no machine is 100% efficient because every machine has friction. A machine can never exceed the work input.

__ Perpetual motion machines are impossible. __

Perpetual motion machines are impossible because in order to have never ending motion you’d have to have no air resistance and no friction. Which can not be done. Here are two more images about Potential and Kinetic Energy.

- Image 1 - Image 2

Here are two videos about Kinetic and Potential Energy... @http://www.youtube.com/watch?v=7K4V0NvUxRg&feature=related @http://www.youtube.com/watch?v=vl4g7T5gw1M

Here is a video about the Conservation of Energy @http://www.youtube.com/watch?v=BVxEEn3w688&feature=related

Here is a game about Potential and Kinetic Energy []

There will be a demonstration in class about Conservation of Energy and Potential Energy
 * 1 || Work is done only when force causes a change in the position or the motion of an object in the direction of the applied force. Work is calculated by multiplying the force by the distance over which the force is applied. Because work is calculated as force times distance, its measured in units of newtons times meters. These units are also called joules. Running up a flight of stairs doesn't require more work than walking up slowly does, but it is more exhausting. Power is the rate at which work is done, that is, how much work is done in a given amount of time. Power is measured in SI units called watts. A watt is the amount of power required to do 1 J oule of work in ! s. Machines help us do work by redistributing the work that we put into them. Machines can change the direction of an input fore. || [] ||