Challenge 1a.
Prove the following example is wrong.
Example: A object rests on the surface of the earth. The object is in a vacuum. Since the object is at rest, there is no motion. There is a downward force acting on the object, which is exerted by gravity. Since the object is at rest, there is an opposite force acting on the object in the opposite direction. This force is called the normal force. Since the object is in a vacuum, there is no force exerted by air. The only forces acting on the object are the force due to gravity and the normal force. The forces are balanced, so the net force is zero. As long as the net force is zero, the object will stay at rest.
Once again, prove any part of my example is wrong. Simply saying that I'm wrong doesn't count. You must clearly prove I'm wrong, with an example citing your sources and reasoning.