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Question Number 111235 by aurpeyz last updated on 02/Sep/20

Commented by aurpeyz last updated on 02/Sep/20

$Pls explain why T_{1} is negative in equation 1$ $but Positive in equation 2 .$ $i j u s t w a n t t o u n d e r s t a n d t h a t s c e n e r i o . p l s$
	Answered by Rio Michael last updated on 02/Sep/20

	$This is by your assumption, that if a force has a direction to the$ $right relative to another force, it is positive .$ $This is how the whole system works .$ $The force F_{N} is applied on m_{1} which is connected to m_{2} by$ $a string (of negligible mass) . This string consequently gets tensioned T_{1 .}$ $when looking at the m_{1} mass, the F_{N} force is to the right, while the T_{1} force$ $is to the left (trying to slow down m_{1}) so by your assumption that$ $forces to the right are positive$ $F_{N} - T_{1} = m_{1} a (N ewtons law) .$ $Now examining m_{2} with forces T_{1} and T_{2} acting, we noticed that$ $T_{1} tries to acceleratd m_{2} while T_{2} tries to slow it down$ $\Rightarrow T_{1} - T_{2} = m_{2} a$
	Commented by aurpeyz last updated on 03/Sep/20

	$t h a n k s i n o w u n d e r s t s n d w e l l . t e n s i o n i s a$ $p u l l i n g f o r c e$
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