Changes

: A '''resultant force''' can be calculated by taking [[force]]s that act along the same line and add them together.: If the [[force]]s are in the same direction as each other, then they have a [[Positive (Number)|value]].: If one [[force]] is acting in the opposite directions direction to another one of the [[force]]s is given a [[Negative (Number)|negative]] value. {| class="wikitable"|-|[[File:ForceNumberLineVertical.png|center|200px]]| style="height:20px; width:300px; text-align:center;" |If the 'up' direction is chosen to be [[Positive (Number)|positive]] then any [[vector]] pointing 'up' has a [[Positive (Number)|positive]] value and any [[vector]] pointing 'down' has a [[Negative (Number)|negative]] value. In this [[diagram]] the green [[vector]] has a value of +2 while the red [[vector]] has a value of -4. If the number lines represent the number of [[Newton]]s [[force]] then the [[Resultant Force]] is the two values added together. F_Resultant = (+2N) + (-4N) F_Resultant = -2N upwards|} {| class="wikitable"|-|[[File:ForceNumberLineHorizontal.png|center|400px]]|-| style="height:20px; width:400px; text-align:center;" |If the 'right' direction is chosen to be [[Positive (Number)|positive]] then any [[vector]] pointing 'right' has a [[Positive (Number)|positive]] value and any [[vector]] pointing 'left' has a [[Negative (Number)|negative]] value. In this [[diagram]] the blue [[vector]] has a value of +3 while the yellow [[vector]] has a value of -2. If the number lines represent the number of [[Newton]]s [[force]] then the [[Resultant Force]] is the two values added together. F_Resultant = (+3N) + (-2N) F_Resultant = 1N to the right|}  {| class="wikitable"|-|[[File:ForceNumberLineVertical.png|center|200px]]| style="height:20px; width:300px; text-align:center;" |If the 'up' direction is chosen to be [[Positive (Number)|positive]] then any [[vector]] pointing 'up' has a [[Positive (Number)|positive]] value and subtracting one from any [[vector]] pointing 'down' has a [[Negative (Number)|negative]] value. In this [[diagram]] the green [[vector]] has a value of +2 while the red [[vector]] has a value of -4. If the number lines represent the number of [[Newton]]s [[force]] then the [[Resultant Force]] is the two values added together. F_Resultant = (+2N) + (-4N) F_Resultant = -2N upwards|} {| class="wikitable"|-|[[File:ForceNumberLineHorizontal.png|center|400px]]|-| style="height:20px; width:400px; text-align:center;" |If the 'right' direction is chosen to be [[Positive (Number)|positive]] then any [[vector]] pointing 'right' has a [[Positive (Number)|positive]] value and any [[vector]] pointing 'left' has a [[Negative (Number)|negative]] value. In this [[diagram]] the blue [[vector]] has a value of +3 while the yellow [[vector]] has a value of -2. If the number lines represent the number of [[Newton]]s [[force]] then the [[Resultant Force]] is the othertwo values added together. F_Resultant = (+3N) + (-2N) F_Resultant = 1N to the right|} ===Examples=== 

: 7[[N]] F_Resultant = (+4N) + (- 4[[N]] 7N) F_Resultant = 3[[N]].: The '''resultant force''' is 3[[N]] down.-3N up

: 4[[N]] F_Resultant = (+3N) + (- 3[[N]] 4N) F_Resultant = 1[[N]].: The '''resultant force''' is 1[[N]] left.-1N right