Lab Motion in Air

TABLE: Time (s) taken by the projectile to reach the ground depending on the angle of release (º)

Angle of release (º)	Time taken to reach the ground (seconds)
	1st Trial	2nd Trial	3rd Trial	4th Trial	5th Trial	Average
10	1,45	1,52	1,44	1,62	1,59	1,52
30	1,39	1,41	1,40	1,38	1,33	1,38
50	1,28	1,31	1,28	1,19	1,21	1,25
70	1,09	1,12	1,15	1,09	1,09	1,11
90	1,03	1,06	0,94	1,02	0,96	1,00

GRAPH:

Conclusion:

As we can see in our results, there's a slight drop of time taken to reach the floor as the angle of release increases. This is caused due to the direction of the forces that take place during the movement of the projectile. Gravity is a force that pulls everything down to the core of the Earth, however, there are other forces that act in the opposite way in order to find an equilibrium between them both.  

     
As we incline the ramp, the direction of the force will also incline. Taking into account this and that gravity acts vertically downwards, the force exerted by the ramp acts in the direction against gravity will be weaker, it will start to move from vertical to diagonal. As less force is exerted against gravity, the quicker it will reach the floor.        
In addition, this diagonal force that the ramp produces will move the projectile to the side to which it is inclined.

The R2 value shown in the graph proves that our results were almost completely truthful as if it was 1, it would present the ideal tendency line.

Evaluation:

There were some problems that we observed after doing the experiment which could have affected our results in some way that they could have not resulted totally as they should have been (because our R2 value is not completely 0). These problems were:

-          The speed at which the stopwatch was started and stopped could have added some extra time to the results as there is a reaction time between the ball is thrown and when the stopwatch is started, and the same reaction time exists when the ball touches the floor, This problem could be solved by recording the experiment and this will make us able to notice the exact moment at which the ball reaches the floor by looking at the time interval between the screenshot of the ball left in the air on top of the ramp and when it reaches the floor. Another solution could be to drop the projectile from a higher position so that this time lost between the moment of dropping it and starting the stopwatch would be much more insignificant than if the time was 1 second, as if would correspond to a smaller ratio (if the time was 1 second, the error of time applied to the experiment will be of 0,25 seconds, which will correspond to a 25 % error percentage, however 0.25 seconds would correspond to a 5% error percentage of a 5 seconds trial).

-          The angle of the ramp, as it was hold with our hands to maintain it in the same position, could have changed slightly depending on the firmness of each of us holding the ramp. This could be easily solved by applying something on the bottom of the ramp, like a pile of books, to support the ramp throughout the experiment in the exact same position, as this support will remain completely static.