The mass is constant, and there is a varying force. So would the mass be the dependent value(y-axis) and the acceleration be the independent value(x-axis)?

 

I think the mass is the dependent value so when I graphed it the line went straight across(horizontal). Is this right?

I don't understand. If the mass is constant, why would you be graphing it, and why vs. acceleration particularly? (And yeah, if you did, it would just be a flat line.)

If the mass is constant, then it would make more sense to graph Force vs. Acceleration where the force becomes your independent variable and the acceleration is calculated using [math]F/m[/math].

It would still just be a straight line, though, albeit a diagonal instead of a horizontal.

That would be the point, I guess. We did a lab similar to this my junior year in high school.