m=9 kg
α=45 °
new=0,5
F=?
Gm=mxgxsin α
Gt=mxgxcos α
ox: F-Gt-Ff=mxa(corpul e in repaus, deci a=0)
oy: N-Gm=0 N=Gm=mxgxsin α
Ff=new x N = new x m x g x sin α
F=Ff+Gt
F=new x m x g x sin α + m x g x cos α
F=0,5 x 9 x 10 x √2/2 + 9 x 10 x √2/2
F=45√2/2 + 45√2
√2=1.41
F=63,45/2+63,45
F=31,72+63,75
F=95,47 N
Succes!
