mosra -mos- gismu

x1 is friction [force opposing motion] due to contact/rubbing between x2 and x3; (fe) x2 rubs x3.

Also x2 scrubs/wipes/brushes (against) x3 (= seltermosra); non-agentive rub (= termosra). See also sakli, sraku, jabre, satre, guska, pencu, spali.

In notes:

guska
x1 blade/scraper/erosive scrapes/erodes/abrades x2 from x3.
jabre
x1 brakes/causes to slow motion/activity x2 with device/mechanism/principle x3.
pencu
x1 (agent) touches x2 with x3 [a locus on x1 or an instrument] at x4 [a locus on x2].
sakli
x1 slides/slips/glides on x2.
satre
x1 (agent) strokes/rubs/pets x2 with x3.
spali
x1 (agent) polishes object/surface x2 with polish x3, applied using tool x4.
sraku
x1 [abrasive/cutting/scratching object/implement] scratches/[carves]/erodes/cuts [into] x2.
zalvi
x1 [individual or mass of hard surfaces] grinds/pulverizes/crushes x2 into powder x3.
mosycpu
l1 drags/hauls l2=m2 by handle/at locus l3 along surface m3.
mosyjgita
j1 is a bowed string instrument using bow m2.
mosyvi'u
v1=m2 rubs off v2 from v3=m3 leaving remainder v4.
simtermosygau
x1 rubs x2 together.
termosra
m3 (non-agentive) rubs/brushes/scrubs against m2 with frictional force m1.
termosygau
g1 rubs m3 against/with m2 using frictional force m1.