1. Net Force: A greater net force acting on an object will result in a greater acceleration. This is described by Newton's Second Law of Motion: F = ma (Force equals mass times acceleration).

* Example: Pushing a heavy box with more force will make it accelerate faster.

2. Mass: The more massive an object is, the less it will accelerate under the same force. Again, this is due to Newton's Second Law.

* Example: A car will accelerate faster than a truck if the same force is applied to both vehicles.