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- Newton's first law

- has a tendency to maintain the current situation. 

- When the substance moves, it has a force to move.

- When the substance don't move, it has a force to not move.

 

- Newton's second law

- well known as a F = ma

 

- weight and mass

- weight is a force which the gravity pull the substance.

- mass is a substance's original, not a gravity force. 

 

- speed and velocity

- speed is always positive number. 

- velocity is not always positive number. It has a direction.

- Newton's third law

- every action there is an equal and opposite reaction.

- when something is pushed, it pulled back. So the force between them are 0.