Concept:Ball bearings reduce friction by using rolling elements, while friction between surfaces can never be fully eliminated on Earth.
Explanation:Ball bearings are designed to reduce rotational friction, not increase it. So statement A is false.
Friction always exists between two surfaces in contact on Earth, so statement B is true.
Rolling friction is less than sliding friction, making statement C true.
The friction force on an object moving through a fluid depends on its shape (drag), so statement D is true.
Answer:Option A – Ball bearings are used to increase friction between parts of a machine. (Incorrect statement)