Physics for engineer/Force and motion

5 Newton's laws

Force and motion

Matter remains stationary when ther is no force acts on it

$F=0$ . O

Matter moves when there is force acts on it

$F=0$ . F --> O -----> O

Matter is at equilibrium whensum of all forces act on it equal zero

$F=0$ . F --> O -----> O

Motion caused by multi force

For any matter Hover above the earth

$F_{g}=F_{p}$

$mg=m{\frac {v}{t}}$

$g=a={\frac {mM}{h^{2}}}$

$h={\sqrt {\frac {mM}{g}}}$

$v=gt$

$t={\frac {v}{g}}$

For any matter circulates above the earth

$F_{r}=F_{p}$

$mvr=mg=m{\frac {MG}{h^{2}}}$

$g=vr={\frac {MG}{h^{2}}}$

$h={\sqrt {\frac {MG}{g}}}={\sqrt {\frac {MG}{vr}}}$

$v={\frac {g}{r}}$

$r={\frac {g}{v}}$