Looking for understanding of very basic force questions

[tigger66]

1. Can someone explain how to work out the force on 2 pylons from a steel beam laid between them.
Beam 3mtrs
Pylon A 30cm from end Pylon B 60cm from other end
Beam has 700 N weight



I have the answers of A 300N and B 400N but not sure how to get there.


Sorry but its over 30yrs since I did this and my daughter is just starting to learn.
Any help appreciated

 

[azizlwl]

Since the body in static, there is no rotational or translational motion.
Take moment at any point, CCW moment equal to CW moment.
For traslational motion, upward force equal to downward force.