DETAILED LESSON PLAN IN PHYSICS OBJECTIVES: At the end of the lesson 1005 of the student should have at least 85% level of mastery should be able to: Analyze the concept of resonance using mathematical methods and physical observations. Give examples of real world application of resonance Apply the concept of resonance in electricity Subject Matter: Topic Unit: Chapter: Lesson: Materials Modified variable/ invented inverter, modified oscillator, quiz visual aids Concepts Resonance is when a wave matches a natural oscillation frequency of a material that causes the atoms of the material to vibrate stronger and accumulate a large amount of energy. Skills Manipulation of the instructional material, manipulation and gathering data using a multi tester Values Team work References University physics 11th edition Developmental Activity Routinely activity Prayer ( the teacher will play a prayer recite by an old woman) Will you please bow your heads and let us pray Greeting the class Good morning Juan dela Cruz!!! Alright I can sense that all of you are still energetic up to this point. Checking of attendance Kindly check who among your seatmates are not inside the room and when you spot somebody missing kindly yell “Juan is missing”~!!! Is that clear? I am glad that we only have a few absentees for today Do you have homework’s? , okay let us proceed to a short recall of the lesson that we had have discussed last meeting which is about waves. You have under your table a miniature picture of a wave kindly bring it out. Now we are going to do the “wave de estorya “activity each one of you will recite a certain concept that you have learned from our discussion of waves and whenever you are able to give a correct concept you will pick one partner and will attach your wavelets to his wave lets and keep the ball rolling in that manner the group that can create the biggest wave will have the wave of blessings. Let us start in three partitions of the class. ( the teacher will choose a student who will initialize the activity) I am happy that you call still recall what we have studied yesterday. Can you describe the wave that is formed by the team that won the wave of blessings? How did it arrive to that size? Right! Can this event/ phenomena can occur to the real world when in terms of real waves? How do say so? Yes that is true. That is called interference but we will concern our selves in resonance. Would you like to learn something about resonance? So that topic “resonance will be our topic today” SHARING OF LESSON OBJECTIVES Analyze the concept of resonance using mathematical methods and physical observations. Give examples of real world application of resonance Apply the concept of resonance in electricity There are questions behind this paper> can you gues what can those be? Well later we will know, but first let us concern ourselves in answering your questions. Resonance is a phenomenon that occurs in a material when a wave matches the normal oscillating frequency of the medium. (It creates bigger amplitude on the part of the vibrating material and hence the molecules vibrate far from each other gathering elastic energy from the inter molecular forces that holds it. Since the wave transfers additional energy to the system oscillation continues and the energy increases indefinitely.) How will this happen in the waves, what might be the factor that affects resonance? Right elasticity of the material is another factor and same is true for the speed. Both of them have something to do with resonance. Let us study this in detailed/ Speed of the wave is connected to the frequency of the wave by the formula;φ=vf When the velocity increase the wave The students will bow their heads and they will pray. Good morning mabuti!! Sir yes sir! None sir!! ( student will do the activity) Their wave is big. The group added their wavelets together to form the big wave packets. Yes sir!! Waves on the ocean get bigger when they join together. Yes sir!!! What is resonance? How does resonance occur in a material? Waves are flexible they can pair easily. They must have the same speed. To do this, I have here an instructional material which can simulate the standing wave emitted using a controlled oscillator. (the teacher will explain what will be done) All you have to observe is the amplitude and frequency of the waves in the two strings, in particular the emitted frequency and the size of the standing wave being produce. Can you deduce a relationship between the frequency and the amplitude of the two waves? What frequency or frequency combination does the resultant standing wave reach its maximum amplitude? ( student might not be able to jot it down in that case teacher will simulate frequency 30and 60Hz.) In the circular motion we can say that the frequency is related to the phase angle. Then we can induce the fact that the frequency of the two waves are in phase. Do you agree with me? Given the length of the string we can get the wavelength for a certain frequency. The ideal formula for the wavelength having a normal mode is L/2. Two here is a constant representing the node and the antinodes of the wave. Let us see what will happen if the node and anti- node of the string is altered by altering the length or the frequency of the oscillator. ( use the instructional material) Can you explain why did this happen? When we mention the momentum we equivalently mean energy so that in the concept of resonance between waves and, matter interaction it involves energy. Thus the change in amplitude of the wave means a change in energy of the entire system. Let us try to change the wavelength by setting the node and the anti- node of the wave. (The teacher will set the instructional material. What can you say now? In what cases/ conditions will the wave reach the maximum amplitude with respect to the wavelength or to the position of the node? All right! Are you still with me? Think pair share. (the teacher will show a picture of a trumpet and a goblet) Grab a partner and then think of an explanation about the picture, you must resonate to the power of two because two0 heads are better than one. The frequency of the trumpets sound matches one of the normal frequency of the goblet and due to resonance energy is deposited to the particles enabling it to brake the mechanical force holding each particles together Is the reason how the goblet was broke into pieces. Values edu! The wall of Jericho was put to the ground! Let us apply the concept of resonance in a physical electrical system. A genius is trying to build an energy expander using the concept of resonance. Will this be probable? Let us try to see if your assumptions are true. ( show the inverter) Whose assumption is correct? Right because electricity can be regarded as a wave phenomena and all waves have the ability to resonate provided they meet the requirements. ( uncover the mystery questions) Recall your question a while back and give your answer to that question right now and tell me the things the you’ve learned today. The student will observe while manipulating the instructional material. The frequency when vary change the resulting wave in the resultant string? The frequency is close to 60 and 120 Hz. Yes sir! There is a change in the resultant wave, (student might not know the answer) The momentum of the particles in the standing wave of the string counter acts so the resultant wave gets smaller. The change in the nodal points changed the amplitude? If the wavelength combination of whole number not a fractional part of the other> ( possible explanation) The sound emitted by the trumpet is very loud that it was able to break the goblet. The sound emitted by the trumpet so high in pitch that it was able to break the goblet. The frequency of the trumpets sound matches one of the normal frequencies of the goblet and due to resonance energy is deposited to the particles enabling it to break the mechanical force holding each particle together. Yes sir! Because the energy of the two waves will add up. No sir! The energy input equals the energy output so that the law of conservation of energy will not be violated. It is probable due to the rate of motion of the electrons at higher frequency is faster that is there will be a large number of electrical current passing the system per unit time. It is probable due to the rate of motion of the electrons at higher frequency is faster that is there will be a large number of electrical current passing the system per unit time. ( student will recall and answer their own questions) Assessment and Evaluation 1.0 What set of wavelength will yield a good resonant frequency? The energy increase in a physical pendulum oscillated by an oscillator, can there be resonance in the system? None> the pendulum will keep on swinging to the momentum and to the law of motion stating that a body will keep on mo0ving and a body is arrest will remain at rest unless otherwise acted upon by a force. None> it is induced by gravity alone Yes> the increase in amplitude is an increase in momentum coupled by the conservation principle of gravity yields a timing creating a nearly perfect resonance. 3. Does radio broadcasting uses resonance? 4.0 How does the antenna pick up the signal from the space? 5.0 describe the formula for frequency and relationship to velocity and wavelength give 5 descriptions. Prepared by Edgardo N.ANNNgeles
Posted on: Tue, 10 Sep 2013 06:09:00 +0000
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