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Can you please help me with Newtons 3rd Law 
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#1
Dec209, 03:57 PM

P: 9

how do you find the Tension force,acceleration,magnitude.
Its those questions where you have pullys,boxes pushing each other... I am really confused for the 3rd law 


#2
Dec209, 05:34 PM

P: 53




#3
Dec209, 06:05 PM

P: 9

Two masses are places in a frictionless pulley system.Solve for the acceleration and tension forces.
1st box is 4kg and the other is 3kg well i know, fnet=ma fg=mg ff=muFn 


#4
Dec309, 10:40 AM

Sci Advisor
PF Gold
P: 11,935

Can you please help me with Newtons 3rd Law
You could start by saying that there is a net, unbalanced force of 10N (For GCSE level thought  or you can do 9.81m/s/s, if you like), pulling one up and one down.
This is accelerating both the masses (7kg total), use your formula to find the acceleration. The tension will be ml times (g + this acceleration) for the light mass and also mh times (g this acceleration) for the heavy mass. Those two values should be the same, natch  as a check. etc etc  you can put in the numbers 


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