Chapter 4. Net external force on an object (4-1)

Question

H4FpicmsoiT4k3jLZLKveV3Qlr/j/M+pxKs4uzgMlngdmEEIn7/qzsV5sS/hHnftkrp5ajKyHn2ECEY3eVlQfg==

{"title":"The net external force acting on an object","description":"Correct!","type":"correct","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":"Wrong","type":"incorrect","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\"}]"}

Question

2Jg3+bFdsTl7XLNMo/PqPZJ4pRwUTpp9lDqqEudkb+GmKVXrOthbE97pTEpw6qRurxoVwx7H/xiXFpz36XJdqkaehy5Y3kscoM3gkOmtPVYKzPkBBx1e5VY69OCWRePh

{"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\"}]"}

Question

AUpPSB1DVRfBMijyZX1D5jo/Y5Bz4waKyDzHKO/fkuVNuwea/lxdOu3w+XBTPCLJG8Z75zgQ/AkrbKmcHptAvmYtzA9f6n6bdUTeIOBQWz6kMLg4uzLn8hl1SM0=

{"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":"Incorrect","type":"incorrect","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":"Correct!","type":"correct","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: