Simulating pendulum movement? (LERP)

I’m at the end of the Building Escape section, and I’m trying to make some swinging axe booby traps down a hallway that continuously swing back and forth. I managed to get them to swing as described, but the problem is they accelerate really quickly during the initial part of the swing, which looks really unrealistic. How would I interpolate them to make it look more natural (closer to pendulum physics)? I tried using the various interpolation functions that can be found under FMath, but they all seem to execute a similar motion. Any tips?

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