Rolling friction is easier than sliding friction. Using ball bearings is an example of creating rolling friction instead of the surfaces sliding against each other. Here option D is correct.
Rolling friction is generally lower than sliding friction. This is due to the fact that when an object rolls, only a small portion of its surface is in contact with the surface it's rolling on, reducing the frictional force. In contrast, sliding friction involves more surface contact, leading to higher frictional forces.
Using ball bearings is an example of creating easier-rolling friction instead of the surfaces sliding against each other. Ball bearings are designed to reduce friction by replacing sliding motion with rolling motion. The small balls inside the bearing facilitate smooth rolling, minimizing contact points and frictional resistance.
This makes it easier for objects to move, and it is particularly advantageous in various applications such as machinery, vehicles, and industrial processes where efficiency and reduced friction are essential for optimal performance. Here option D is correct.
Complete question:
Rolling friction is _______ than sliding friction. Using ball bearings is an example of creating ________ friction instead of the surfaces sliding against each other.
A - easier fluid
B - harder-rolling
C - harder-fluid-
D - easier-rolling