1
.m=10000g=10kg; g=10N/kg
Scrpetele fix schmba doar directia fortei. Deci F=R
R=G greutatea galetii
G=mg
G=10×10=100N
R=100N
F=R=100N
2.
L=1m ; m=75kg; bR=25cm=0,25m; R=? ; F=?
G=m×g
R=G
R=m×75×10=750N
RbR=FbF ⇒F=RbR/bF
bF+bR=L
bR=0,25m
bF=L-bR
bF=1-0,25=0,75m
F=RbR/bF
F=750×0,25/0,75
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