Here's the question you clicked on:
TMA76
Which of the following will happen? Assume all the mass is distributed at the end of the seesaw arm and that the mass of the seesaw itself is negligible.
The seesaw will rotate counter-clockwise. The seesaw will rotate clockwise. The seesaw will remain balanced. You cannot tell from the information provided.
if moments about the fulcrum are equal the seesaw will remain balanced are you familiar with moments ?
the moment is the weight of the mass time distance from the fulcrum
So its 10kg*1m = 10 and 2kg*5m=10? so they are equal?