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Static Friction Required to Keep the System from Moving (Two Boxes)
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[QUOTE="Steve4Physics, post: 6836151, member: 681522"] Agreed. This is the tension when A and B are both accelerating. It is less than the tension when A and B are not accelerating. The above equation is wrong. The left side of the equation, “9.8 * x * 0. 3”, is the limiting static frictional force. It is the (maximum) magnitude of the frictional force on block A when A is just on the point of slipping but [U]still has zero acceleration[/U]. The right side of the equation is the tension in the absence of any friction, when the system [U]has maximum acceleration.[/U] There is no justification for equating the two quantities, they apply to very different situations. In fact the left side is always bigger than the right side. ________ PS. If you want to display equations using LaTeX, enclose the LaTeX code between a pair of double hash signs, ##\#\#LaTeX code\#\###, or between a pair of double dollar signs, ##\$\$LaTeX code\$\$##. For example, \frac {19.6} {x + 2} x, with hashes, renders as ##\frac {19.6} {x + 2} x##. And with dollar signs it renders as $$\frac {19.6} {x + 2} x$$The preview toggle button on the right side of the edit toolbar (top of edit window) lets you check how it looks before you post. For more detailed LaTeX help, try the link at the bottom left of the edit window. [/QUOTE]
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Static Friction Required to Keep the System from Moving (Two Boxes)
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