Answer:
1. Isaac Newton formulated the laws of motion.
2. Friction is a force that slows or stops motion.
3. Inertia is the tendency of an object to resist changes in its state of motion.
4. Equilibrium: the state of body at rest or in uniform motion, the resultant of all forces on which is zero.
5. Newton's First Law of Motion states that a body at rest will remain at rest unless an outside force acts on it, and a body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force.