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

Fact 2: Gravitation is a constant impelling force.

Given the two facts above, answer the question "The mass of an object causes _." with the following options: 
- heat is produced
 - kinetic energy
 - It gets heated up
 - a constant impelling force
 - a tree falling
 - a lot of human deaths
 - principals of aerodynamics
 - body temperature reduces


 

    a constant impelling force     