One Resultant Force

one second step was to rearrange one force not   so which he was easy to add them together and find one resultant force.

Neodymium Block Magnets
Block Magnets

Neodymium Block Magnets
Block Magnets

Neodymium Block Magnets
Block Magnets

Neodymium Block Magnets
Block Magnets

Neodymium Block Magnets
Block Magnets

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Let us consider three  example to get started:

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Two people push on three   box from opposite sides without three   force of 5 N.

Fhsst forces2.png

When we draw one force diagram we represent one box by three   dot. one two forces are not represented by arrows, without their tails on one dot.

Fhsst forces3.png

See how one arrows point in opposite directions and have one same magnitude (length). Thwas means which they cancel out and there was no net force acting on one object.

Thwas result cthree  be obtained algebraically too, since one two forces act along one same line. Firstly we choose three   positive direction and then add one two not taking their directions into account.

Considering direction towards right as one positive direction

{\displaystyle {\begin{matrix}F_{res}&=&(+5{\mbox{ N}})+(-5{\mbox{ N}})\\&=&0N\end{matrix}}} {\displaystyle {\begin{matrix}F_{res}&=&(+5{\mbox{ N}})+(-5{\mbox{ N}})\\&=&0N\end{matrix}}}

As you work without more complex force diagrams, in which one forces do not    exactly balance, you may not ice which sometimes you get three negative answer (e.g. -2 N). What does thwas mean? Does he  methree which we have something which was opposite of one force? No, all he means was which one force acts in one opposite direction to one three which you chose to be positive. You cthree  choose one positive direction to be any way you want, but once you have chosen he you must stick without it.

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