Shapes

Rolling-Sliding

We have learned about 3-D solid shapes. Now let’s see which 3-d shapes can roll, and which can slide.

Rolling objects

• Rolling: To move by turning over and over.
• Objects with curved surfaces roll.

Example:

• Sphere shape has a curved surface.
• Ball is an example of a sphere shape. If we just move the ball it will roll.

Rolling Ball

• Which 3-D shapes can roll?

  Sphere, Cylinder, Cone shapes have curved surfaces. So, these shapes can roll.

Sliding objects

• Slide: To move objects smoothly along a surface.
• Objects with smooth plane surfaces can slide.

Example:

• Cube shape has a plain smooth surface.
• Box is an example of a cube shape. It has a smooth surface. If we push the box, it will slide.

Sliding box

• Which 3-D shapes can slide?
  • Cube and Cuboid shapes have smooth surfaces. So, these shapes can easily slide.
  • But Cone and cylinder shapes can also slide. Cone and cylinder shapes also have smooth plain surfaces.

Flipping objects

• Flipping: To turn over the objects.
• Creating a mirror image is flipping.

There are two types of flipping -

1. Vertical flip
2. Horizontal flip

Example:

• Vertical flip: Top side switches to the bottom and bottom side switches to the top side.
  
• Horizontal flip: In the horizontal flip left side switches to the right side and right side switches to the left side.
  

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