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Title: Measure Ball Launch
I. Introducción

We chose “Measured Ball Launch” because we are interested in aerodynamics and physics. We play with different balls in different sports. Why is this so? The shape and material of balls influences their capacity to move and bounce. The goal of this project is to measure and calculate which ball goes highest and farthest so we can learn howthe material and shape affect the movement of the object through air. Based on the different shapes and materials of different balls, our hypothesis is that the golf ball will go the farthest and the football will go the highest distance In the experiment we are going to launch different balls using similar amount of force and the launching method will be same. We will measure the distance theball travel from the launching point to the place it touches the ground for the first time, and the time it takes the ball to hit the ground. The information obtained will be used to calculate the height. Based on the results we will check if our hypothesis was accepted or rejected.

II Problem:
Which type of ball goes the farthest and highest, a football, a base ball, a tennis ball or a golfball?

III Hypothesis:
The golf ball will go the farthest, the foot ball the highest.

IV Literature Revision:
The topic of this science fair project (launching balls and measuring their trajectories) was chosen to learn more about aerodynamics. Aerodynamics is the study of forces and other factors that affect movement through air. The information researched described that the purpose ofthe depressions on golf balls is to decrease aerodynamic drag. A force on an object that resists its motion through an object or liquid is called drag. When the fluid is a gas, it is called aerodynamic drag. Footballs are made of leather for durability and better grip. They are shaped like ovals to decrease the aerodynamic drag. Newton’s laws will be used to describe the movements of the balls. Thefirst law is that every object stays the same until force is applied. The second law is there is a relationship between the mass of an object, its acceleration and the force that pushes it. The third law is that for every force there is an opposite and equal force. All objects are submitted to gravitational pull on earth

Graphs will be used to show the balls journey. Newton’s laws will beapplied to explain the forces producing the balls movements (rolling, accelerating or decelerating). The composition of the ball is also an influencing factor on the ball’s movement.

V Materials:
a tennis ball
a football
a baseball
a golf ball
a skate board
a weight of 10 lb.
a large flat grassy area
Masking tape
Measuring tape
stopwatch
digital weigh

VI Procedure:
1.-Mark thespot to place the skateboard with duck tape marking the placement of each wheel, ensuring the same placement of the skateboard before the launching of each ball. Mark the spot where to place each foot upon standing to drop the weight for the ball launching with duck tape. The same person will drop the weight for each ball launching.
2. Place skateboard on the flat ground with wheels on the marks.3.-Stand on the mark for dropping the weight next to the skateboard and hold the weight with arm stretched straight down.
3.- Place the center of the ball on the back edge of the skateboard at the level of the back wheel.
4.-Release the 10 pound weight so it falls onto the board and forces the opposite end of the skateboard to move upward making the ball launch forward.
5.-A second personmeasures the time the ball flies in to the air by starting the stopwatch when the ball is launched and stopping it when it hits the ground the first time. The time is recorded in seconds.
6. Using measuring tape measure the straight distance from the launching point to the spot where the ball first touched the ground. The measurements is made in centimeters.
7.- Repeat steps 2 to 6 for each...
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