Forces on an object that do not change the motion of the object

No

Explanation:The three main forces that stop moving objects are friction, gravity and wind resistance. Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion. When you add equal forces in opposite direction, the net force is zero.

6/12=1/2

step-by-step explanation:

measure their densities same density, same sub