Asupra corplui actioneaza forta F=4 N care are componentele Fx= F cos α,
Fy= Fsin α, reactiunea N si forta de frecare Ff
miscare rectilie unif deci a=0
Fx-Ff=0 Ff= Fcosα=4*[tex] \sqrt{3} [/tex]/2=2[tex] \sqrt{3} [/tex]=3.46 N
N-G=0 N=G
Ff=coef frec*N =coef frec*G coef frec=Ff/N= 4/8= 0.5