I mean, if you weigh 170 pounds, this would be like pulling three SUVs totaling 12,000 pounds. Ridiculous, right? I’ll give you a hint: It’s not about weight or mass—at least not directly. It’s about friction, which is the resistance to motion between two surfaces that are in contact.
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Scientists attempt to link 3D printed ghost guns to specific filament brands with chemical fingerprinting。关于这个话题，whatsapp提供了深入分析