Water Rocket Lab Report

Figure 1
Interpretation of the data
Graph 1 indicates that as the dry mass of the water rocket increases, the maximum altitude it can reach when launched decreases. The R2 value, which indicates the strength of the correlation between two variables, where one indicates perfect correlation and zero indicates no correlation, in this graph is 0.989. Moreover, the correlation is negative, which can be seen from the coefficient of the X in the equation (-40.667x+ 30.02). For every gram the rocket’s mass increases the maximum height gets reduced by 0.0407 meters. This specifies that as the dry mass of the water rocket increases, the maximum height it can reach decreases. The relationship can be interpreted as linear.
Water rockets with higher

This correlation is very strong as the R2 value is over 0.95. The vertex of the graph lies in the point (0.69,23.084) where 0.69 is the value of the amount of water and 23.084 is the maximum achieved height. It implies that, if all the other parameters are maintained constant, a water rocket will be able to reach its maximum height when it is filled at around 34%. If it is filled excessively more or less than 34%, the rocket will fail to reach its maximum potential height.
Water acts as the fuel in the water rocket, but unlike other conventional vehicles having too much of it is not recommended. On one hand, having too much water is not good because there is not much water to “push away” and create thrust, on the contrary having too much is not good either because it makes the rocket very heavy and reduces its capability to reach maximum potential height.12 It is recommended that filling the rocket within the range of 33% to 40% produces the best results; in this way, the rocket has enough water to eject for thrust, but is light enough to reach high

The association between these variables are very strong, because the R2 value is almost 1. It can be further understood that that for each unit changed in the launch pressure the maximum height is affected by around 9.44 meters. Fundamentally, it can be taken that as the launch pressure of a water rocket increases, the maximum height it reaches also increases. The relationship between these variables are linear and proportional.
Launch pressure is the pressure level of the compressed air inside the rocket and it is directly related to the thrust which is one of the major forces acting on the water rocket. The higher the launch pressure is at launch, the higher the thrust and therefore, the higher the rocket will reach; this also works in the other way. However, having very high pressure is not necessarily a good thing, it can be potentially dangerous. National physics laboratory from the UK recommends the maximum launch pressure to be no higher than 5 bars, which is approximately 5 atm. Having too much pressure can lead to the rocket exploding or other disastrous consequences, this will be further discussed about in the safety