# Stiffness

If two springs of stiffness K1 & K2 are in series, the equivalent stiffness is.......................

#### santoshmit Profile Answers by santoshmit

• Dec 13th, 2007

k1xk2/k1+k2

#### vijay.rooney Profile Answers by vijay.rooney

• Jul 11th, 2008

k1.k2/k1+k2

#### Usman Adil Profile Answers by Usman Adil Questions by Usman Adil

• Jan 31st, 2009

It should be noted that when springs are in series then their equivalent stiffeness decreases and when they r in parallel, stiffness increases.so we have to apply a larger force in parallel spring system and lower force in series system.

#### nk

• Aug 5th, 2011

1/k1+1/k2

#### kumarrajesh18587 Profile Answers by kumarrajesh18587

• May 16th, 2012

1.All Springs in series will experience the same force F applied at the end. (F=F1=F2)

2.Total deflection of this system will be equal to deflection of individual spring (L=L1+L2)

As F=KL

THEREFORE

F1=K1 x L1 , F2=K2 x L2
OR L1=F/K1, L2=F/K2
SO L=L1+L2 WILL BECOME
F/K=F/K1+F/K2
OR 1/K=1/K1+1/K2
OR K=(K1 x K2)/(K1+K2)

#### MECHANICAL

• Nov 21st, 2017

K1+K2

#### deepak kumar

• Mar 7th, 2018

k1k2/(k1+k2)  