When you use a longer tool, you’re effectively increasing the distance from the pivot point where you’re applying your force. Even if you apply the same amount of force, the longer distance multiplies that force, making it much easier to turn the bolt.
You can think of using a tool like a wrench or a breaker bar as similar to using a see-saw. When you sit on a see-saw, if you’re sitting closer to the middle, you need to push harder with your legs to lift yourself up. But if you sit further away from the middle, it becomes easier to lift yourself up. This is due to leverage.
I’m not sure how else to put it but I hope it helps in some way.
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