Arre, Newton sahab's formula works fine: to stop a 5 kg apple crate sliding in my van from 10 m/s in 2 seconds, force comes to -25 Newtons. That minus sign? It’s just the van’s brakes pushing opposite to motion, like when I jam my foot on the pedal going downhill to the mandi.
But here’s the thing—real stopping force is always more. My maths says 25N, but on that wet road last Tuesday, I needed double the pressure. The minus sign is neat, but friction never reads the textbook, yaar.
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