Mass hanging from the roof of a moving truck. Newtons laws.

AI Thread Summary
The discussion centers on a physics homework problem involving a mass hanging from the roof of a moving truck, analyzed through Newton's laws. Key equations mentioned include the force of gravity (Fg=mg) and the components of tension (Ft) in the string. The participant struggles to determine the acceleration related to the tension force and feels uncertain about the necessary equations for dynamic scenarios. They note that while static problems are manageable, net acceleration introduces confusion. The conversation highlights the complexities of applying Newton's laws in non-static situations.
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Homework Statement


[PLAIN]http://img28.imageshack.us/img28/7341/capturehzm.jpg


Homework Equations


Fg=mg
Ft=ma
Ftx=Ftsin(22)
Fty=Ftcos(22)
Fg-Fty=? I realize this is probably required but I don't know where.


The Attempt at a Solution


I believe the acceleration the question is asking for is the acceleration on the tension force but I have no idea how to figure that out. I also believe I am missing an equation to substitute something else into.

The don't have a problem with static problems because you can always set something to zero but when there is net acceleration I just get confused.
 
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The vertical component of the tension in the string = mg
The horizontal component accelerates the mass forwards.
 

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