# Atwoods machine Problem.

1. Oct 10, 2007

### maxxed

Using this site as a reference: http://hyperphysics.phy-astr.gsu.edu/hbase/atwd.html

Can somebody show me how to solve this:

Suppose you dont have a watch, or a timer, and you want to use an Atwood's machine as a timer to give an accurate time interval (for the vertical fall) of t = 10.0s. Suppose the vertical fall, y, is 1.30m. Determine values of M and m which would make t - 10s.

Some formulas

a = (2h)/t2
g= a x ((2M+m)/m)/m

2. Oct 10, 2007

### learningphysics

Find the acceleration using the formula you have.

Then set this acceleration = $$\frac{M-m}{M+m}*g$$ (taking M as the heavier mass and m as the lighter mass of the atwood machine).

this will only give a relationship between M and m. is there any more information for the problem?

3. Oct 10, 2007

### maxxed

nope just that. Im guessing it might be sufficient just to have the relationship

i'm assuming g= 9.80
?