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    E:\Working\Brother_Education\Foundational_Stage_Maths-2_(11-09-2024)\Open_Files\Chap_07
                   \ 02-Nov-2023  Bharat Arora   Proof-1                                    Reader’s Sign _______________________ Date __________

                  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 7D

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

                          Object

                            roll

                           Slide

                           Stalk

                  2.  Name and draw the shape that

                       (a)  can slide and stalk but not roll.                          Project

                       (b)  cannot slide or stalk but roll.                       Take a cardboard sheet/any hard
                                                                                  sheet and try to make an object
                       (c)  can slide, roll as well as stalk.                     with (a) 4 faces (b) 1 face.

                  Mathematics-2                                                                                         141

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