Force is a Vector

Force has magnitude and direction

Force is a vector quantity, which means it has size (magnitude) and direction.
Example: Pushing a box with 10 N to the right.

SI unit: Newton (N)

The standard unit of force is the Newton (N).

Balanced forces

When two equal forces act in opposite directions, the object does not move or continues moving at constant speed.

Unbalanced forces

When one force is stronger than the other, the object starts moving, stops, or changes direction.