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    E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_08
                   \ 17-Nov-2023  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  SurFacE oF objEctS

                  We identify whether a solid can stalk, roll or slide,

                  by observing its faces or surfaces. That means
                  stalking, rolling or sliding of objects depends upon

                  the nature of their surfaces.
                  Let us try to make a stalk of cubical blocks as well

                  as balls.

                  Blocks can be stalked easily but we cannot put a ball on another
                  ball without external support. This is because a cube has a plane
                  surface and a ball has a curved surface.

                  If a solid is made up of only plane faces, it slides.
                  Here, we can see that the pencil box has plane faces. So, the box

                  is sliding.

                                            If a solid is made up of only curved faces or surfaces, it rolls.

                                            Here, we can see that the ball has only a curved surface.

                                            So, the ball is rolling.

                                            Some solids are made up
                                            of both plane and curved

                                            faces. Such objects can
                                            roll as well as slide.

                  Here, we can see that the juice-can has both
                  plane and curved surfaces. So, it is rolling and sliding.

                           Practice time 8d

                  1.  Look at the given objects. Find which can roll, slide or stalk.

                          Object

                            roll

                           Slide

                           Stalk

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