Vector Quantity - A quantity that has both magnitude and direction (e.g., force)., Resultant Force - The single force that has the same effect as all the individual forces acting together., Vector Addition - The process of adding vectors together by placing them tip-to-tail., Scalar Quantity - A quantity that has magnitude only (e.g., mass, time)., Equilibrium (for forces) - A state where the resultant force on an object is zero., Triangle of Forces - A closed triangle formed by three vectors, showing the forces are in equilibrium., Newton (N) - The SI unit of force., Coplanar Forces - Forces that act in the same plane., Net Force - Another term for resultant force., Sign Convention - A choice of which direction is positive (+) and which is negative (-).,

4.1 Combining Forces

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