Gravitation

1. Gravitational force

1.1. F=GM(1)M(2) / r²

2. Terms G=gravitational constant (6.67x10-¹¹ Nm²/kg²) W=weight(mg) g= acceleration due to gravity(9.8m/s²) M= mass of planet m=mass of object R=radius of earth or planet r = total distance from planet surface P=density(mass/volume) T= period of simple pendulum (2π√L/g)

3. Acceleration due to gravity

3.1. At surface g=GM/R²

3.2. At height •g(h)=g(R/R+h)² •g(h)=GM/(R+h)² , If h→R •g(h)=g(1-2h/r), If h←←R

4. Velocity