strength is the law of beat, which is divided into single, complex, transformation, interleaving and mixing. The relative time signature is different, so is the law of strength.

The common beats are as follows:

2/4 beats-only two beats per bar, and that's the law: strong and weak.

3/4 beats-there are only three beats per bar, and that's the law: strong, weak and weak.

4/4 beats-there are only four beats in each bar (but it can be divisible by two), so the rules are: strong, weak, sub-strong and weak.

6/8 beats-there are only six beats per bar (but it can be divisible by two), so the law is: strong, weak, weak, sub-strong, weak, weak.