Newton's Laws

Object: Battery buggy 

Constant motion: Newton's first law states that an object at rest will stay at rest, an object in motion will stay in motion with the same speed and direction unless an unbalanced force acts upon the object. When the battery buggy was off and at rest, it stayed at rest unless it was pushed by someone. When the battery buggy was on, it stayed moving in the same direction and same speed unless we stopped it or added extra force by pushing it. 

Change in motion: Newton's second law of motion says that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. This is shown in the equation F=ma. When the battery buggy was on and moving at a constant speed, the net force was changed when I stopped the car. By stopping the car with my hand, I added an unbalanced force on the buggy. I changed the acceleration and therefore changed the net force. 

Action-reaction force pair: Newton's third law says that for every action pair there is an equal and opposite reaction pair. The reaction pair is the same in magnitude and type yet opposite in direction. The table and the battery buggy were an action-reaction pair. The normal force of the battery buggy pushed down on the table and the normal force of the table pushed up on the battery buggy. The normal force on these objects was the same magnitude but a different direction since they are action-reaction pairs.