아주아주 작은 힘 측정하는 방법

아주 작은 힘이나 무게를 측정하려면 어떻게 해야할까요? 머리카락무게 보다 더 작은 것들이나 머리카락을 미는 힘보다 더 작은 힘 말이죠
예를 들면... 레이저 포인터의 힘 정도랄까...?

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Thanks to Rich Press and NIST for the great visit.
Thanks to Dr. Gordon Shaw for showing us around his lab and teaching us about measuring tiny forces.
You can check out all the cool work going on at NIST here: https://www.nist.gov/

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References:

Lee, J. (2016). Measuring Tiny Forces With Light. NIST. – https://ve42.co/Lee2016

Melcher, J., Stirling, J., Guzman, F., Pratt, J. & Shaw, G. (2014). A self-calibrating optomechanical force sensor with femtonewton resolution. Applied Physics Letters. – https://ve42.co/Melcher2014

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Written by Derek Muller
Edited by Trenton Oliver
Animation by Ivy Tello
Filmed by Derek Muller, Trenton Oliver, and Emily Zhang
Additional video/photos supplied by Pond5 & Getty Images
Music from Epidemic Sound
Produced by Derek Muller, Petr Lebedev, and Emily Zhang
Dubbed by Mingi Kwon
Additional Edited by JH, J
Supported by Yuna Lee