Post by: LB7 on 10/09/2020 13:53:26
xw6.png (72.56 kB . 973x737 - viewed 2379 times)I can slide the dot where the elastic is fixed on the green line because I want the elastic always vertical and I need to move it in lateral position for that. No energy needed nor recover from that because the force is always perpendicularly to the movement.