Relativity theory assumes that the effect of accelaration on an object equals the effect of this force
[DOC] [TLE] Law of Gravity - Physics [PAR] Newton knew that the force which caused the apple's acceleration (gravity) must 
be ... (We assume the Earth to be spherical and neglect the radius of the object 
relative ... by the Relativity Theory), but weight depends on the location of the 
object.