How does rolling in parkour videos help them feel no pain at all? How does it not break their knee or ankle?
In: Physics
Force = mass times acceleration. It’s important to remember that acceleration doesn’t mean “speeding up”, even though that’s how people often think of it: “acceleration” means “how quickly your speed is changing”.
So, if your speed changes very quickly – say, from “falling down” to “completely stopped” – then you experience a lot of force. But if your speed doesn’t change much – say, from “falling down” to “rolling forwards *almost* as quickly as you were falling” – then you experience a *lot* less force.
Have you ever heard the joke “it’s not the fall that kills you, it’s the sudden stop at the end”? It’s pretty much true. If you roll instead of just landing, though, then there *is no sudden stop*.
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