# Homework Help: Constant force?

1. Oct 6, 2004

### UrbanXrisis

It is true that whether using one rubber band or a bunch, a constant displacement will result in a constant increase in force?

I did this experiment in school and both experiements gave me a linear line for Force vs Displacement.

2. Oct 6, 2004

### Diane_

That's Hooke's Law. To a close order of approximation, as long as you aren't near the elastic limit, yes.

3. Oct 6, 2004

### arildno

I'm not quite sure what you mean by "constant" in this context, urbanXrisis:

We say that we have a LINEAR relationship between force and displacement if (for example) a doubling of the displacement causes a doubling of the force.
In the case of rubber band (or a bunch of them), modelling the force/displacement as a linear relationship is close enough to reality to be called true..(up to a point, that is..)

4. Oct 6, 2004

### UrbanXrisis

yes, thanks for the replys, it helped me out

5. Oct 6, 2004

### Pyrrhus

Urban, also consider

Straight Line Equation

$$y = mx + b$$

Hooke's Law

$$F = kx$$