# How does the following variables affects the period of a bifilar pendulum?

Hey everyone, I am a highschool student from New Zealand and I have 4 questions concerning the period of a bifilar pendulum system. It is very much appreciated if you can answer in detailed explanation.

1. Why does increasing the length of strings L increases the period of oscillation?
2. How does increasing the length of rod r increases the period of oscillatiion?
3. How does increasing the seperation D between the two strings lowers the period of oscillation?
4. How does the strength of gravity g affects the period of oscillation?

The equation given is

• What do you need exactly? If the formula you attached is the solution of this strange pendulum, well, it contains already all the answers you need – patta May 27 at 14:00
• Ah you need a "why". I suggest you to make a drawing of this system with the rod a bit rotated; it should clarify all. The only extra brick is the lenght $r$ of the rod, that affect the rotational moment of inertia. – patta May 27 at 14:02