Re: PHYSICS HOMEWORK PROBLEM
- From: "PD" <TheDraperFamily@xxxxxxxxx>
- Date: 12 Oct 2005 07:16:47 -0700
jbgibson@xxxxxxxx wrote:
> There are three blocks connected by a string. m1=0.5kg, m2=1.7kg;
> m1 and m2 are connected at the top of a friction-less surface; m3=2.9kg
> and is hanging off the end of a pulley. looks kinda like this:
>
> [ m1 ]----[ m2 ]-----O
> xxxxxxxxxxxxxxxxxxxxx|
> xxxxxxxxxxxxxxxxxxxxx|
> xxxxxxxxxxxxxxxxxxx [m3]
>
> a) find the acceleration of the masses shown in the figure.
>
> I realize that the only force acting on m1: T= m1a, and the force
> acting on m3: m3g-T=m3a. I am cofused about what to do with m2. Any
> help is greatly appreciated.
There are two strings and therefore two tensions. Indeed, if the two
strings had equal tension, what would you know about the acceleration
of m2?
Note that since you'll have three free-body diagrams, you'll have three
equations, with which you'll be able to solve for three unknowns: the
two tensions and the acceleration.
PD
.
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