circular motion
  when a point move on the circle then its motion is called circular motion  or regular motion following are the main characteristics of circular motion
   angular displacement
   angular velocity
   angular acceleration

 angular displacement
  it is a defined as the body moving on circle process angular displacement it directly proportional to Linear displacement trainer. Complete its angular displacement is equal to in and radiation

 angular velocity
  it is obtained as a displacement iron has made by what is that time is called angular velocity

 angular acceleration acceleration is the rate of change of angular velocity is called angular acceleration it is called with Alpha it is  vector quantity and its unit is red/sec

  universal gravitational law
   according to this law the force between two masses is directly proportional to the product of their masses this love makeover the Inverse Square Law so it shows that gravitational force is inversely proportional to the square of distance between them

 mass of Earth
 mass of earth can be calculated forms  gravitational acceleration

 average density of Earth the average density of Earth can be calculated by using the the equation of density
 is that you like is where there for its density is a y p and the volume of the determine