# Hookes law question need help

1. Oct 17, 2011

### antphany

1. The problem statement, all variables and given/known data

given a spring constant of 2.1 x 10^6 N/m, calculate the amount of force needed to stretch a steel rod 0.001m

2. Relevant equations

f=kx

3. The attempt at a solution

dont know

2. Oct 17, 2011

### atisundar

its plug and chug problem........... you can't do it ? k and x is given.........find f

3. Oct 17, 2011

### QuarkCharmer

Hookes law states that the force required to stretch/compress a spring is proportional the the distance it stretches. That is where F = kx comes from, since the proportionality statement implies that they differ by a constant. If the constant k was 1, the force would equal the distance and so on. You are given k (the coefficient of proportionality aka spring constant) and x the distance, you simply need to solve for the force right?

4. Oct 17, 2011

### antphany

correct but idk

5. Oct 17, 2011

### NewtonianAlch

Let's say A = b*c

b = 10
c = 10

What is A equal to?

6. Oct 17, 2011

### SammyS

Staff Emeritus
Given a value for k, and a value for x, can you calculate f ?