... describedwith symbols such as x, y, and z (for position), r (for radius), a, b, and c (for the legs of a right tri-angle), ᐉ (for the length of anobject), d (for a distance), h (for a height), etc.Quick ... for the object? (a) A single force acts on the object. (b) No forces acton the object. (c) Forces act on the object, but the forces cancel.Quick Quiz 5.3 An object experiences a net force and ... theelectron and proton that form a hydrogen atom. A third example of a field force is theforce a bar magnet exerts on a piece of iron (Fig. 5.1f). The distinction between contact forces and field forces...