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                                                                         UNIT 1 :    MOTION    ( Lesson 3)          


                                         SECTION 3 , LESSON 1 ( Gravity and free falling motion).

                               (  Free falling object motion or dropping motion  ,  circular motion).




       -  First of all let’s watch a video about what free fall vertical motion is.

          *After watching that video, what do you think are the most important issues
           we have to have on account when approaching and facing a free fall motion
           exercise or situation?.  
          SCAFF 7d :  Fill out the chart .
 
           +Next you’ll find the chart filled in, to check it and correct your answers and
            the way to fill it out. It Will be posted once we achieve yet the activity in class.


                                                 

       -  Link 1:  Free falling motion introduction website.  Motion’s details and gravity.
       -  Link 2:  Read here what GRAVITY is and what gravity’s acceleration is.

       -  Link 3:  This website has really remarkable information, solved exercises, 
                     diagrams and graphs to learn more about gravity and free fall.

       - Let’s watch this video about how to solve a one dimensión MRUA free fall motion
         ( upwards thrown object motion ) exercise and after watching it 
          we’re gonna work it out again by ourselves.  
         This would be the wording about the problem this teacher is figuring out :

         A kid is placed 20m high from the ground and throws an object upwards with a  
         velocity of 15m/s. Find out the time the object takes to fall and  hit the ground  
         and the final velocity it takes just before hitting the ground.  


        - Let’s just do the same exersice as the previous one above but this time the kid 
          is throwing the object from the same high at the same speed but to the down 
          direction, to hit the ground directly.  Watch the video now in class or at home 
          (follow your teacher’s directions) and we do it later on the board.

         


          SCAFF 8 :
       -  Pic Activity   :    Check this pic your teacher’s taken showing the equations 
                                  between MRUA (uarm) and free falling motion. Write on your 
                                  notebook what they both have in common and why they have
                                  something different. You’ll need to read the links 1, 2 and 3 from 
                                  above of this lesson to know well what free falling motion is 
                                  about.
                                  You can also get some HELP from this page from your book.


       -  At this point we do exercises 11 and 12 on page 27 from your student’s book.
          Sol :  11 i 12  


       -  Let’s check : Upward thrown object motion exercise example 8 on page 28.


       -  After checking the example, let’s try this one!! :

          A person standing on the edge of a high cliff throws a rock straight up with an initial velocity of 13.0 m/s. The rock misses the edge of the cliff as it falls back to earth. Calculate the position and velocity of the rock 1.00 s, 2.00 s, and 3.00 s after it is thrown, neglecting the effects of air resistance.  
       sol : within LINK 3 above




       - Watch the following pic about Hulk, Spiderman and gravity and have a small
         talk in groups or in pairs to give your opinion about the studied motions involved.

                                                       
                                       SPIDERMAN’S ROLLER COASTER PIC





       -  Now we do exercises 13, 14 and 15 on page 28 from your book.

           solutions :   ex 13     ,     ex 14     ,     ex 15




        
       -  Link  : Link from the last school years with free falling motion exercises and 
                     examples and videos helping solving this kind of problems.

       -  Link :  Free fall motion complex problem to solve, and solution provided.


                   *  Take a look to this cartoon and discuss what’s involved in it



       - To review the lesson you can try doing the following exercises on page 35 from 
          your book. You are also given the solutions at the following links :

             Exercise 58                           Exercise 59                              Exercise 60
        







                             UNIFORM CIRCULAR MOTION.



       -  Link 1a:    Uniform circular motion video to start.

       -  Link 1b:    Visualize circular motion agains constant acceleration motion.

       -  Link 2:    Circular motion main equation and information.

       -  Link 3:    Circular motion teacher’s website with physics related to circular 
                        motion.

       -  Link 4 :     Circular motion experience 1 done by last years former students.



                      * Choose one of the following experiences to make:

       -  Link 5a:      Uniform circular motion experience 2 to achieve.
       -  Link 5b:      Uniform circular motion experience 3 to achieve.
                              You can also check the same experience as 5b here in 5c.
       
              +  How to transform or convert degrees to radians and vice versa :

               
                                           Link 1           Link 2        Link 3  

                          Link 4 with teacher’s notes about doing conversion
                          factors from degrees to radians and back.





         MAIN TASK :

        - Once you’ve checked all the materials from this blog and you have already organized your 3 or 4 people group, share responsabilities among your group’s members in order to write a general outline for giving a speech later showing your contents about uniform circular motion, linear velocity, angular velocity, differences among them and conclusions. Don’t forget to give experimental data and examples to substantiate your reasons.


         * If needed you can get help to collect vocabulary and structures to write your text from the quizz and all other materials provided at the blog.





       - You do now exercises 16, 17 and 18 on page 30.

         solutions :           ex 16 and 17               ex18




       - Circular motion exercise from the blackboard .  Wording :

         Some friends are skating around in circles holding by their hands in line. A girl
         at the opposite end of the line is 12m far away from the center of the circle they
         are spinning around. One girl’s friend is closer to the center spinning with an 
         angular velocity of Pi/2 rad/s and a linear velocity of 4m/s.

         Find the linear velocity the girl shows at the Edge of the skating line in a certain
         momento and the distance the boy is placed from the center of the circle.


         *Check the solution here on these two pics :

                
                                          PIC 1                             PIC 2





       - Make a lesson summary like this one appearing on page 31. Do it in english 
         language and try to use your own words.








  ORAL PRESENTATION. MOTION ISSUE SPEECH.


        - And now you can check on these files the steps to be followed in order to make  
          and design an oral presentation about one specific motion lesson issue left up
          to you.  On the first file you will find some help, advises and rules to write your
          presentation and some important aspects to keep in mind when you make your
          speech to the audience. At the second one you are provided by information and 
          tips in order to assess your peers’ presentations :


                    1)     First file:   how to prepare your presentation.

                                                        


         - Students’ pics for the MOTION ISSUE speeches :

           Diana :   Foto1   Foto 2   Foto 3   Foto 4

           Raúl :     Foto1

           Wiam :   Foto1

           Marco :   Foto1

           Adrian:   Foto1

           Nicole:    Foto1

           Anna:     Foto1

           Dylan:    Foto1

           Aida:      PowerPoint 1










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