gravitation

• satellites-

  • projectiles with horizontal and vertical motion
  • horizontally travelling at a constant speed
  • vertically accelerating as the satellites direction is always changing
  • accelerates at a constant speed
• gravitational field strength -

  • the force on a unit mass at a point in the feild
  • $g=$$F/m$
  • g- $N/KG^-1$, f - $N$, m - $KG$
• newtons law of gravitation -

  • when objects aren't in uniform gravitational field we cant use f=gm
  • gravitational constant that effects everything - $G=$$6.67*$$10^-11m^3kg^-1s^-2$
  • every object in the universe attracts one another with a force directed along the line of centres for the two objects that is proportional to the separation between the two objects
  • $F=$$G( m1m2/r^2)$
  • r = distance between objects