Acceleration is the link to kinematics.

• From $\vec{F}{}_{\text{net}}$, find $\vec{a}$.

• From $a_x$, find $v_x$ and $x$.

$\vec{a}=\vec{0}$ is the condition for equilibrium.

• An object at rest is in equilibrium.

• So is an object with constant velocity.

Equilibrium occurs if and only if $\vec{F}{}_{\text{net}}=\vec{0}$.

Mass is the resistance of an object to acceleration. It is an intrinsic property of an object.

Force is a push or a pull on an object.

• Force is a vector, with a magnitude and a direction.

• Force requires an agent.

• Force is either a contact force or a long-range force.