**Newton****’s 1**^{st} law:

Inertia, the tendency to continue in a given state.

**Newton****’s 2**^{nd} law:

The acceleration of an object is directly proportional to the net force, and inversely proportional to the mass. F=ma

**Newton****’s 3**^{rd} law:

For every force, there is an equal and opposite force.

**One Newton:**

The force need to accelerate 1kg at 1 m/s/s.

**Normal Force:**

A reaction force pointing perpendicular to the surface.

**Equilibrium:**

When all the forces on an object balance out, or cancel out, the object has a net force of 0.

**Static Equilibrium:**

When an object is in equilibrium, and not moving, this is called static equilibrium.

**Dynamic Equilibrium:**

An object moving at a constant velocity; no net force acting on it.

**Friction:**

A force that always opposes motion.

**Coefficient of friction:**

The ratio between the frictional force and the normal force.