# Evalute the value of extension

• Oct 21st 2010, 11:03 PM
r-soy
Evalute the value of extension
Attachment 19412

evaluate the value of extension ( x) which elongate under the action of load (w) of 6 N ? [Use your results obtained from rest 1 ]

Experience as follows :

First, we put spring on the board and a paper under spring to measure the distances between each point from the beginning to the end point of extension for each weight

Then we increased laod to ( 0.2 n ) the measurement was between the starting point until end point of extension is 51 mm (( same steps for all load ))

Then we've decrease the weights ( Every time one ) from end ( 0.5 ) to (0,1 ) we got same measurements

then We calculated the average by calculat increases and decreases and divide by 2

For information, there is a Positive relationship between weight and extension
plese help me
• Oct 22nd 2010, 02:26 AM
sa-ri-ga-ma
First of all you have to find spring constant. For that use readings 5 and 3, and 4 and 2.

$k = \frac{(0.5 - 0.3)}{(135 - 78)10^{-3}}$

Similarly calculate k for the readings 4 and 2. Then using f = - kx find x foe 5 N.
• Oct 22nd 2010, 03:26 AM
r-soy
plese I fon'r undertand

see the test (1 )

http://www.mathhelpforum.com/math-he...n-dkm30822.jpg
• Oct 22nd 2010, 03:28 AM
r-soy
k = mg/x

0..04/1 = 6 / X

x = 6.6X10^-6 cm

plese help me