Grommet be used purely decoratively for crafting. When used in sailing and various other applications, they are called cringles. Sometimes field workers refer to them as grunyons. If metal or another hard material has a hole made in it, the hole will probably have sharp edges. Electrical wires, cord, rope, lacings, or other soft vulnerable material passing through the hole can become abraded or cut, or electrical insulation may break due to repeated flexing at the exit point. Rubber, plastic or plastic coated metal grommets are used to avoid this. The grommet could also protect the wiring/cabling from contamination from dirt,
Ant on a rubber rope most of those assumptions explicit. If the speed at which the target-point is receding from the starting-point is less than the speed of the ant on the rope, then it seems clear that the ant will reach the target-point (because it would eventually reach the target-point by walking along the axis, and walking along the rope can only carry it further forward). However, though it does not seem clear at first, the ant will always reach the end of the rope, no matter the ant's speed or the speed of the rope's expansion. This can be reasoned by the following: