Newton got the idea of forces from change in motion, acceleration. Aristotle had the idea no force no motion, Newton recognized inertial motion without force.
The newton is a unit of force. Examples of forces are gravitational force, electric forces, magnetic forces, forces caused by pressure.
He didn't
I would say Issac Newton is best known for getting hit in the head with an apple and coming up with the idea of gravity. Newtons 3 laws
Newton
because he as a cow
newton meter
Forces are a natural phenomena, no one invented them! Isaac Newton was one of the first to describe them using physics and mathematics
Unbalanced forces cause acceleration.
Equal and opposite forces was Newton's recognition of equal anti-parallel forces, or the sum of the forces is zero in Equilibrium.
Isaac Newton
Calculating forces.
Isaac Newton