# Homework Help: Question about units

1. Sep 11, 2009

### chelseaalyssa

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

In an equation of the format y=mx + b, where y=(m1-m2)g and x=acceleration (m/s2) ... what are the units for m and b?
(I know that m is the slope and b is the y-intercept, but what do they mean?)

Thanks :)

2. Sep 11, 2009

### Redbelly98

Staff Emeritus
Welcome to PF

Each term, "mx" and "b", must have the same units as y.

So, first question: what are the units of y?

Next question, what units for m would result in mx having those same units?

3. Sep 12, 2009

### chelseaalyssa

The units of y = kg x m/s^2

Therefore, the units of b must equal kg x m/s^2 as well.

In order for mx to have the same units as y, the units of m should be kg right?

4. Sep 12, 2009

### chelseaalyssa

Also - does kg x m/s^2 equal Newtons?

5. Sep 12, 2009

### Redbelly98

Staff Emeritus
Yes, to everything you said/asked in post #'s 3 & 4

That depends on the context, i.e. on the specific details of what x and y are and how they were measured or calculated.

6. Sep 12, 2009

### chelseaalyssa

Ok great, Thanks!!