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Introductory Physics Homework Help
Solving Free Body Diagrams with 1.9kg Object & F1=5, F2=2
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[QUOTE="Simon Bridge, post: 4547838, member: 367532"] Welcome to PF; The values don't matter - you need to apply the [i]method[/i] not the solution. When you put a set of axis on your diagram, you will find that some forces are at an angle to some axis. In the diagram on the left: [ATTACH=full]164871[/ATTACH] the 3N force is 20deg from the -y axis - which is why the 20deg is important. When you sum the forces in the y direction you get: ##2.82-3\cos(20^\circ)=ma_y## See how the axis in the diagrams have been rotated to simplify the math? In diagram A it was most convenient to rotate the axis 20deg from the usual position because that way most of the forces lined up with some axis - less trig to do. In diagram B there was more choice - they chose a 15deg rotation to line up the force being calculated - so there are fewer steps in the calculation. [/QUOTE]
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Solving Free Body Diagrams with 1.9kg Object & F1=5, F2=2
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