#### Title

The Effects of Adding Divots to the Hull of a Boat on its Drag

#### School Name

Heathwood Hall

#### Grade Level

10th Grade

#### Presentation Topic

Physics

#### Presentation Type

Non-Mentored

#### Oral Presentation Award

1st Place

#### Abstract

The purpose of this experiment is to identify the effects on the drag of a boat caused by adding small divots across the hull. This experiment was performed by having two boats made out of metal using the same proportions, one with small divots placed evenly across the hull and the other having a flat hull. These boats were then connected to a string that ran from the boat to a weighted pulley that would pull the connected boat through water. The amount of time it took for the weight to hit the ground was measured using a stopwatch. The speed of the weight falling would correlate to the speed of the boat moving through water. The faster the weight fell, the faster the boat traveled. The speed of the boat would be determined by how well it traveled through the water. This means that a boat with a lower drag would go faster than a boat with a higher drag. Although the ANOVA analysis of the data suggests variation between the two data sets, the difference was not enough to be considered statistically significant. Thus the results of the experiment support my null hypothesis, Adding Divots to the hull of a boat does not seem to decrease drag.

#### Recommended Citation

Heaton, John, "The Effects of Adding Divots to the Hull of a Boat on its Drag" (2017). *South Carolina Junior Academy of Science*. 180.

https://scholarexchange.furman.edu/scjas/2017/all/180

#### Location

Wall 307

#### Start Date

3-25-2017 10:00 AM

#### Presentation Format

Oral and Written

#### Group Project

No

The Effects of Adding Divots to the Hull of a Boat on its Drag

Wall 307

The purpose of this experiment is to identify the effects on the drag of a boat caused by adding small divots across the hull. This experiment was performed by having two boats made out of metal using the same proportions, one with small divots placed evenly across the hull and the other having a flat hull. These boats were then connected to a string that ran from the boat to a weighted pulley that would pull the connected boat through water. The amount of time it took for the weight to hit the ground was measured using a stopwatch. The speed of the weight falling would correlate to the speed of the boat moving through water. The faster the weight fell, the faster the boat traveled. The speed of the boat would be determined by how well it traveled through the water. This means that a boat with a lower drag would go faster than a boat with a higher drag. Although the ANOVA analysis of the data suggests variation between the two data sets, the difference was not enough to be considered statistically significant. Thus the results of the experiment support my null hypothesis, Adding Divots to the hull of a boat does not seem to decrease drag.