*HEADING
.INP  Distributed load tests of GRAV, CENTRIF, and ROTA for
MASS elements.
*NODE
1,10.
*ELEMENT,TYPE=MASS,ELSET=MASS
1,1
*MASS,ELSET=MASS
100., 
*BOUNDARY
1,1,6
*STEP,PERTURBATION
*STATIC
*DLOAD,OP=NEW
MASS,GRAV,32.2,0.,1.,0.
*NODE PRINT
RF, 
*OUTPUT,FIELD
*NODE OUTPUT
RF,
*OUTPUT,FIELD
*ELEMENT OUTPUT
LOADS,
*EL PRINT,FREQ=0
*END STEP
*STEP,PERTURBATION
*STATIC
*DLOAD,OP=NEW
MASS,CENTRIF,300.,0.,0.,0.,0.,0.,1.
*END STEP
*STEP,PERTURBATION
*STATIC
*DLOAD,OP=NEW
MASS,ROTA,10.,0.,0.,0.,0.,0.,1.
*END STEP