Fact 1: The mass of an object causes the gravitational force exerted by that object.

Fact 2: All gravitational forces are attractive, there is no repulsive gravitational force.

Given the two facts above, answer the question "the mass of an object causes the what exerted by that object?" with the following options: 
- electromagnetic energy
 - Electrical energy
 - attractive force
 - heat energy
 - friction
 - solid, liquid, gas
 - energy of moving objects
 - kinetic energy


 

   attractive force      