Newton's Second Law of Motion

The net force on a body is equal to the product of the body’s mass and its acceleration.

• From experiments, we saw that the net force on an object is proportional to the acceleration of the object.

$$F\propto a$$

• Turns out the proportionality constant is the mass of the object!

$$\vec{F}=m\vec{a}$$

• $1kgm{s}^{-2}=1N$