Is a smack an assault or cruelty?

Assault on a child,

Every one is liable to imprisonment for a term not exceeding 2 years who–

(a)Assaults any child under the age of 14 years; or

Cruelty to a child.

Every one is liable to imprisonment for a term not exceeding 5 years who, having the custody, control, or charge of any child under the age of 16 years, wilfully ill-treats or neglects the child, or wilfully causes or permits the child to be ill-treated, in a manner likely to cause him unnecessary suffering, actual bodily harm, injury to health, or any mental disorder or disability.

At what point does a smack become any; unnecessary suffering, actual bodily harm, injury to health, or any mental disorder or disability.

It is no wonder other countries have come to grief over this stupidity. How will parents cope under the constant scrutiny of the state, while their friends and relatives become front page news for inappropriate child discipline?