Enrage conservation
Question:

In the above video we can see Roi sitting on his skateboard on the upper side of the street, when he lift up his legs his skateboard starts to roll down the street, when he wants to stop his skateboard movement, Roi pull down his legs so that they have contact with the side walk and the skateboard stops.

To his amaze, when he teach his shoes, he can feel that they are hotter then they were before he used then to stop his skateboard.

What is the source of energy that caused Roi's shoes to hat up?

3 People tried to answer this question

Potential gravitation energy that transformed to kinetic energy that transferred to hit because of the friction between the sidewalk and Roi's shoes

Kineticenergythat transferred to hit because of the friction between the sidewalk and Roi's shoes

Energy from the sun that caused the sidewalk to hit up

Kineticenergythat transformed topotential gravitation energythat transferred to hit because of the friction between the sidewalk and Roi's shoes



Comments:
1.  gavrieli benny (2005-12-20 15:00:00)
הערכת עמיתים

הי דן,

 

השאלה שהכנת רלוונטית לתוכנית הלימודים של מדעים בחטיבת הביניים,

מאוד אהבתי את הסרטון האישי שהכנת. הסרטון מאוד עוזר להבין את השאלה. סרטון מקורי המציג בעיה בתחום היומיום של תלמידים, אני מניח כי אין תלמיד / ה שלא חוו את תחושת חימום הנעליים כאשר עצרו עם הרגליים את האופניים.

ממליץ לבצע השיפורים הבאים:

1.      לבדוק את האנגלית. לדוגמא השם רוי מופיע בשני אופנים שונים.

2.      סרטון – מכיוון שחימום הנעליים הינו הנושא. ממליץ כי יעשה זום על הנעליים לקראת סוף הסרטון.

3.      נדרשנו להוסיף נקודה רלוונטית על המפה + סרטון אישי בו אנו מופיעים ואומרים משפט רלוונטי באנגלית,

בהצלחה,

 

גבריאלי בני

2.  Taballag Hiba (2010-12-20 15:00:00)
assessment

Hi Dan

Your question is suitable for the middle school syllabus; the video is also good, it illustrates the conversion of energy at day life activities which is very good for students.

In my opinion, you need to review the language of the text, there are many spelling and grammar mistakes such as: the tittle " Enrage conservation" you should write the conversion of energy.

" then he teaches his shoes"  you should write Touch.

" hotter then "  you should write than.

I suggest you to write the answers as a schema with pictures to clarify each type of energy for example:


    

                                                          Kinetic energy

You don't have a point on the map. You should add a point with suitable information. Check the map, I added a new point with nice simulation.


Good luck

Hiba Taballag.







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