Quoting SPHLC:
1.4.2.8. 60 Newtons? To fire the seat by pushing the handle forward. Is that broadly similar to a force of 60kg? 75% of his bodyweight? (I know about force and mass etc, but broadly speaking for the man in the street)
No... Approximately 10 Newtons per Kg. Kg is a downwards (weight) force, influenced by gravity. Newtons are a measure of force, in any direction. 60 Newtons would be about 6 Kg of force.