Net external force on an object (4-1)

Question 1 of 3

Question

$\textbf{The net external force}$ acting on an object...

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Question

... equals the $\textbf{vector sum}$ of all the individual forces that act on the object.

{"title":"The net external force acting on an object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"28,6,55,46\"},{\"shape\":\"poly\",\"coords\":\"82,133\"}]"} {"title":"...equals the the vector sum of all individual forces that act on the object","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"98,8,134,50\"},{\"shape\":\"rect\",\"coords\":\"149,6,188,51\"},{\"shape\":\"rect\",\"coords\":\"204,7,241,52\"},{\"shape\":\"rect\",\"coords\":\"264,14,301,45\"}]"} {"title":"The sum includes only external forces (forces exerted on the object by \perpher objects).","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"50,29,81,52\"}]"}

Review

What determines how an object moves is the vector $\textit{sum}$ of all of the forces acting on that object, also called the $\textbf{net external force}$ on the object (or, for short, the $\textbf{net force}$ ). If the individual forces acting on an object are $\vec{F}_1, \vec{F}_2, \vec{F}_3$ , and so on, we can write the net force on that object as: