I mean, is applyForce the force at any given time, meaning dt is irrelevant, or is applyForce the force per second in which case, dt becomes important?
Current project: https://togfox.itch.io/hwarang
A card game that brings sword fighting to life. Simple to learn, hard to master. Learn when to advance, dodge, strike and counter. Learn how to strike without being struck. https://discord.gg/HeHgwE5nsZ
The force applied by applyForce should not be multiplied by dt in principle. It lasts the duration of dt that you pass to world:update(); if you want it to be applied for longer, you have to apply it multiple times.