FORCE ANALYSIS - FORCE ANALYSIS External Constant Radial...

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FORCE ANALYSIS External Internal Constant Variable Radial Tangential Contact Field Action/active Reaction/passive Real Fictitious Conservative Non-Conservative The above list can serve as a reminder and aid when diagnosing force related problems. Whether a force is outside or external to your choice of system is important because only external forces can cause acceleration. The same force can be external in one system but internal with respect to another. We can choose our system(s) to eliminate unknown forces in the problem by making these unknown forces internal forces with the correct system choice. Internal forces are important because an internal action can cause an external reaction. We push down on the arms of the chair to rise and the chair reacts and pushes up on our arms. Solving tension problems for multiple strings utilizes the system technique to eliminate unknown tensions. (See supplement on tension.)
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