When we move one surface over another, the rough uneven parts rub together. This force is called ____ ____ Friction ____ objects down. For example, ____ between your shoes and the floor stop you from slipping over. We can reduce friction through lubrication (e.g. adding oil to gear parts), by adding rollers or ____ like those on a train or ____ and by adding an air cushion, like on a ____ Friction between an object and the air is called ____ Car engineers try to minimise this force by making cars rounder and lower, a method known as ____ This method also allows cyclists that wear lycra to move quicker.

Friction

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