# Homework Help: Newton's second law lab graph

1. Feb 3, 2008

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Graphs Of Acceleration And Force

Hi!!!

We did this lab....on Newton's Second Law. we are trying to prove the formula F=ma...

Now i drew this graph of acceleration vs time and force vs time....they look similar..how can i interpretate them?

someone help!!!! MY lab is due tomorrow!!!

2. Feb 3, 2008

### Staff: Mentor

They are supposed to look similar, they are only different by a scaling factor (mass). In fact, if instead of plotting each against time, if you were to plot force as the y axis and acceleration as the x axis then you should get a straight line with slope equal to m.

3. Feb 3, 2008

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ok..thas true...but now the problem is that....i have plotted force on y axis and acceleration on x-axis....and i calculated their slope and found an equation....the slope is suppose to be the mass of the object rite?
but I am getting smthing slightly different.
Actual mass is 1.04kg and the mass that i calculated was 1.13kg. Why are they different?

4. Feb 3, 2008

### pixel01

Your measurements need to be more precise. I think acceleration measurement is not easy.

5. Feb 3, 2008

### fact file

oh thanks....

what am i suppose to do here?

Compare the graphs of force vs. time and acceleration vs. time for a particular trial.

What do i do here...i am confused :S

6. Feb 3, 2008

### Staff: Mentor

<10% experimental error is probably quite good for the kind of experimental setup you would usually have at a typical school lab.

7. Feb 3, 2008

### fact file

oh thanks...dale and pixel

8. Feb 3, 2008

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HOw do u compare acceleration vs. time and force vs. time graphs?

PLz help pplz