The clue is in the question.
Isaac Newton, he discovered: -Newton's First Law of motion. -Newton's Second Law of motion. -Newton's Third Law of motion.
F = m a
yea
His First Law and Second Law both do.
Mass
This is because two concepts are derived from the newtons second law. First : Force . F = m * a Second : momentum .. p = m * v
The link at the bottom will help you out, its a video
newtons second law of motion
(Mass) x (Acceleration)
Newton's third law of motion is that for every action there is an equal and opposite reaction. This law is also called reciprocal motion/force or "action-reaction."
Actually, the first one is completely independent on the second one. But the second one doesn't make any sense without the first one.
Force=mass*acceleration