Thanks for the reply's.
I believe that the integral idea from your experiment should be that weight has no effect on acceleration.
My research question is measuring energy released. So going to calculate the potential energy and kinetic energy on the incline.
Also my values are similar with the weight ontop of car. So I don't think I'm doing anything wrong just yet lol.
On a side note I'm going to calculate the components (perpendicular and parallel) acceleration (as said before) and the energys. Should be enough I think.
For a larger mass, the force is greater. So F/m is constant (on the same incline). It's like that experiment with the feather and the heavy ball, they both fall at 9.8 m/s2 (neglecting air resistance). So, you're right in that the acceleration just depends on the angle You could take into account friction but again that wouldn't be different for different weights (N=mgcos(theta) on an incline so F/m = gcos(theta)).
Also, for your experiment you should compare your experimental values (using the data from the experiment) to theoretical (a=g sin(theta)). You could find reasons for why your experimental values different from theoretical - eg friction as mentioned above, or air resistance etc
Hope this helps
Thanks for the detailed answer but I just got completely confused. So do I go and use a=gsin(theta) or my partners method (a=v/t^2)
So which method is correct for 30°
Method 1) a=gsin(theta) therefore a=9.8sin(30)=4.9
Therefore acceleration= 4.9ms^-2
Or
Method 2)v=s/t therefore 1.5/0.86=1.74 therefore a=v/t^2 therefore 1.74/0.86^2=2.35
Therefore acceleration= 2.35ms^-2
Which method is correct 1 or 2?
Edit those were some of my results so don't get confused by numbers.