system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why is a long screwdriver "stronger" than a short screwdriver?

I was trying to remove several wood screws that I could hardly turn at all when using a 5” long screwdriver (and a lot of physical effort). 

Switched to an 8" long screwdriver and I could easily turn the screws with a lot less effort. 

My father, who was a craftsman, told me when I was younger that longer screwdrivers are stronger than shorter ones. What physics principle explains this?
gpt
Theres no mechanical advantage gained from simply using a longer shaft without also a larger handle. The advantages are mostly ergonomic. A large part of the impression just comes from longer screwdrivers also having longer and wider handles in general. But assuming the handles are identical:

A longer shaft gives you room to get a good palm grip on it with your hand fully around it, hold the screwdriver closer to your body to be able to apply more torque, and let you elbow move downward, and helps with maintaining alignment with a longer shaft meaning less angle change from the same horizontal displacement.

Also the shaft being longer is more springy, which gives you a softer/better feel for how much force you are applying.