Like any wave, a sound wave doesn't just stop when it reaches the end of the medium or when it encounters an obstacle in its path. Rather, a sound wave will undergo certain behaviors when it encounters the end of the medium or an obstacle. Possible behaviors include reflection off the obstacle, diffraction around the obstacle, and transmission (accompanied by refraction) into the obstacleor new medium.
1. Read carefully,
2. Make a draw for each paragraph, in order to give your ownidea about the reading.
3. When techar indicates, solve the quiz
|Work |Energy |Power |
|refers to an activityinvolving a force and |is the capacity for doing work. You must have |is the rate of doing work or the rate of |
|movement in the directon of the force. A |energy to accomplish work - it is like the |using energy, which are numerically the |
|force of 20 newtons pushing an object 5 |"currency" for performing work. To do 100 |same. If you do 100 joules of work in one ||meters in the direction of the force does 100|joules of work, you must expend 100 joules of |second (using 100 joules of energy), the |
|joules of work. |energy. |power is 100 watts. |
THE CHANGE IN THE KINETIC ENERGY OF AN OBJECT IS EQUAL TO THE NET WORK DONE ONTHE OBJECT.
This fact is referred to as the Work-Energy Principle and is often a very useful tool in mechanics problem solving. It is derivable from conservation of energy and the application of the relationships for work and energy, so it is not independent of theconservation laws. It is in fact a specific application of conservation of energy. However, there are so many mechanical problemswhich are solved efficiently by applying this principle that it merits separate attention as a working principle.
MINI-QUIZ TO CHECK YOUR UNDERSTANDING
(solve it in separated sheet, explain in 50 word why you choose any answer, ask and request the extra sheet to your teacher!)
Top of Form
1. Why work is related to mass and velocity (or speed)?
2. What kind of work is the “Net work”,explain as you understand?
INTRO - How Many Types of Energy are There?
If a psychologist were asked to diagnose energy, she might say it has multiple personality disorder (is there such a disorder?). Our fascinating friend Mr. Energy seems to have a lot of ways to express himself. "Oh yeah," you might ask, "How many types of energy are there?". "Two?, Twenty?, One?". I know, I know.You hear about all kinds of different energy forms. You hear about electrical energy, chemical energy, kinetic energy, mechanical energy, heat, potential energy, work, and others too.
1. Read carefully,
2. Extract the main idea from each paragraph (wathever english or spanish)
3. Make a draw for each paragraph, in order to give your ownidea about the reading.
4. Whentechar indicates, solve the quiz
“Kinetic Energy is Matter in Motion”. Kinetic energy is the energy contained in a moving mass or in a moving particle (a particle is a tiny bit of matter). I think it might be fun to call this "happening energy" (hoping I don't get in trouble with any teachers). If you could look close enough, or small enough, youwould see that when anything is "happening", work is being done, or has been done, and something (mass), or a whole lot of little "somethings", are moving.
Work and Heat are Processes (and Forms of Energy?)
There are just two ways that energy is transferred - by work or by heat. We often use the words work and heat as if they are forms of energy. I do it all the time and I'm not sorry. But...