Se muestran los artículos pertenecientes al tema 4ESO FQ 2018-2019.



                                                                      UNIT 1 :    MOTION               9/13/2018  Friday

        -  Subject introduction, units, class organization and working class issues.

                                                                                                                           9/17/2018  Monday

         Speed :  Just as distance and displacement have distinctly different meanings (despite their similarities), so do speed and velocity. Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time. Contrast this to a slow-moving object that has a low speed; it covers a relatively small amount of distance in the same amount of time. An object with no movement at all has a zero speed.

        Velocity :  Velocity is a vector quantity that refers to "the rate at which an object changes its position."
                         Velocity is a vector quantity. As such, velocity is direction aware. When evaluating the velocity of an object, one must keep track of direction. It would not be enough to say that an object has a velocity of 55 mi/hr. One must include direction information in order to fully describe the velocity of the object. For instance, you must describe an object’s velocity as being 55 mi/hr, east. This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity and is direction aware.

       - Write down now at your workbook or binder the difference between speed and velocity. Just try to use your own words to highlight the difference.

        - What position is :
                             Position is a place where someone or something is located or has been put. In physics, position is usually a number on an axis.
                             Position is a vector, because direction matters. But distance is a scalar. Distance is how far you’ve traveled. In order to know the posicion an object takes we need a fixed frame of reference to compare different points or spots,  starting point with final point.

                                                                - Frame of reference 1.

                                                                - Frame of reference 2.

                                                                - Reference frame video.

                                                                - Video about what position is.

    - As homework or for you to review these concepts, just check the following link at home, watch the videos and rewrite the main issues on your workbook or binder :      

                                                    Link to review position, distance and displacement.