Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 6th Edition
4
Dynamics: Newton's Laws of Motion
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4-4 to 4-6: Newton's Laws, Gravitational Force, Normal Force
4-7: Newton's Laws and Vectors
4-8: Newton's Laws with Friction; Inclines

Problem 34
A
3.93m3.93 \textrm{m}
Giancoli 6th Edition, Chapter 4, Problem 34 solution video poster
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COMMENTS
By dorfte on Fri, 9/14/2012 - 9:49 PM

how do you know g is positive?

By Mr. Dychko on Thu, 9/27/2012 - 8:43 PM

Hi dorfte, "g" is technically always positive. It's meant to represent the magnitude of the acceleration due to gravity. This means the acceleration due to gravity (not just its magnitude), in a traditional coordinate system where down is negative, is -g (note the negative in front of the "g").

In my re-drawing of the Attwood machine in this video, I made left negative, and right positive, which is conventional. I like to make negatives 'explicit', which means I put them directly into the equation, instead of having them hidden within variables, which is why I wrote F2F1=m2gm1gF_2 - F_1 = m_2g - m_1g at about 2:15 in the video.

By eandb17 on Wed, 10/24/2012 - 1:58 AM

Why don't you take Force Tension into account. ANSWER QUICKLY PLEASE. Thank You

By kathya on Tue, 3/11/2014 - 4:59 AM

Where video plz???

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