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Hi I'm investigating pendulums for physics and I was wondering if someone could explain how this equation works and why: T=2π√(L/g) Where T is period, π is pi, L is length of string and g is gravitational force:9.8 m/s. I need to understand the physics for this formula because i was hoping to create an E.E.I. where I investigate the effects of changing length of the string to the period. Thank you for any possible help =], Oh I'm also in year 11 so I'm not very advanced in physics.