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Physics Mechanics- connected particles

Shah 72

Member
Apr 14, 2021
193
A horizontal bar of mass 1kg hangs from a pair of parallel vertical rods of negligible mass, attached to either end of the bar. A third vertical rod is connected to the middle of the bar and a 4kg mass hangs from this below the rod. Work out the tension in each of the rods.
I got the tension in the third vertical rod= 40N. I don't know how to find the tension of the other two rods.
 

skeeter

Well-known member
MHB Math Helper
Mar 1, 2012
935
did you sketch a FBD?

forces acting on the 1 kg bar …

$T_1+T_2$ up, $1g + T_3$ down
 

Shah 72

Member
Apr 14, 2021
193

skeeter

Well-known member
MHB Math Helper
Mar 1, 2012
935

Shah 72

Member
Apr 14, 2021
193

skeeter

Well-known member
MHB Math Helper
Mar 1, 2012
935
yes, but that’s not the “physics” reason … what do you know about translational and rotational equilibrium?

recommend you look them up if you haven’t heard those terms before
 

Shah 72

Member
Apr 14, 2021
193
yes, but that’s not the “physics” reason … what do you know about translational and rotational equilibrium?

recommend you look them up if you haven’t heard those terms before
Sure. Thanks!