A) scientific method. An elastic surface such as rubber and a very hard surface such as concrete will result the highest bounce level. This calculation is shown in the data analysis section above. Variables - The Tennis ball experiment WebControlled Variables: Bouncy ball used, surface bounced off of, technique in which ball was dropped (initial height was measured from base of ball). You may now be able to understand or verify things that you discovered when gathering information for the project. Averages are more reliable than using one result as they take into account variation between results. Why or why not? A bouncing ball is an example of oscillatory motion as the ball is oscillating about the equilibrium position. The weight and material of the ball will be kept the same throughout the experiment by using the same ball. If the drag is less the ball will fall faster and is less likely to reach its terminal velocity. This means that the faster that the ball travels the larger the force of air resistance upon it. CoR = coefficient of restitution = (speed after collision)/(speed before collision). The ball weighs exactly 2.5g. We use the conservation of energy. 15 inches, and the golf ball bounced 26 inches. = The distance between the bottom of the ball at the top of its arc after bouncing and the ground. Perform this test in a Gym or anywhere else where you have a hard surface and an accessible wall. WebVariables: Height from which the ball is dropped Mass of the ball Material ball is made from External factors, i.e. Dependable controls are sometimes very hard to develop. At first, try to choose variables that you think act independently of each other. The ball rebounds to 38 percent of its previous height and continues to fall. Control variable - Wikipedia In a real-life scenario, the ball will eventually stop moving due to external forces such as air friction. C) Frozen tennis balls will not bounce as high. This means that if a heavier ball is to be used then it will need to be dropped from higher to reach its terminal velocity. If you have any questions or need more support about this project, click on the , If you are new in doing science project, click on . Following are some sample information that you may find: Everyone has played with balls that bounce, but few people truly understand the physics behind a bouncing ball. In this experiment you will test the bounce of a dropped ball for different surface hardness. These stages can also be represented graphically using three plots including a displacement, velocity, and acceleration vs time graph. Your assistant will record the bounce. It shows that heights were recorded that exceeded the height that the ball would have reached had it been dropped in a vacuum. Once the drag force equals the gravitational force all forces are equal and acceleration stops. What Effects the Bounce of a Dropped Ball The more KE that the ball possessed as it hit the floor, the more that was transferred into elastic potential energy and back into KE. B) If this is an ideal scenario where energy is not lost and the ball continues to bounce infinitely, what is the distance of travel? It was more reliable to use the middle three results as it automatically discounted any anomalies; assuming two similar anomalies were recorded for one height, if they were then they both would be discounted. Method: To set up the WebControl Variable: Simple Definition. Calculating the coefficient to restitution of ball hitting the floor: The coefficient to restitution can be found out from a graph of h1against h2. This will mean that I will have to have the interval between the different heights from which the ball is dropped from less than 20cm, probably at 10cm. Writing Quality. h2= The distance between the bottom of the ball at the top of its arc after bouncing and the ground. GPE=Mass (kg) Gravitational Field Strength (N/Kg) Height (m). They identify variables to be changed, measured and controlled. These are parts of the experiment that you try to keep constant throughout an experiment so that they won't interfere with your test. What is the dependent variable in the bouncing ball experiment? Variables are If you did not observe a consistent, reproducible trend in your series of experimental runs there may be experimental errors affecting your results. The ball then rebounds: it undents and tosses itself up into the air to a good fraction of its original height. Drag is a squared function of velocity and therefore as the ball drops drag increases a greater amount each second. From this it can be seen that using the average of the middle three results is more accurate than using the average of all five, as it automatically discounts most anomalies. This coefficient of restitution, e, is actually the ratio of the velocity of recession (upwards after the bounce) to the velocity of approach (downward before the bounce). During the preliminary experiment it was established that time was not an important factor that had to be taken into account when deciding how many different heights to drop the ball from and the interval between those heights. Advanced levels of experimental science rely heavily on graphical and mathematical analysis of data. the Scientific Method Hence, the only force acting on the ball is gravity. Grades: Preschool and K-2 Length of Lesson: Approximately 45 minutes Related Video: The Hawk Factor episode Learning Goals: This will be called the average of the middle three repeats. This is because it is the easiest and quickest variable to alter. What factors affect the bounce of a dropped ball? A bouncing ball follows a projectile motion which is moving near the surface of the earth in a curved path due to the effect of gravity. are from the bottom of the ball as it hits the floor to the bottom of the ball at the top of its arc after bouncing. Since v2 = 2gh, the CoR = v/v = sqrt(h/h) where h is the height of the bounce and h is the height from which the ball is dropped. WebThe Bounciest Ball Experiment Overview: In this lesson, students conduct a series of experiments with different balls to observe which bounce the highest and to see how they could make balls bounce higher. What is the control variable in the bouncing ball experiment? The acceleration on the ball is the acceleration of gravity, which acts downwards on the ball. \[S_{\infty} = \frac{\alpha(1-r^{\infty})}{1-r} = \frac{\alpha(1-0)}{1-r} \qquad S_{\infty} = \frac{\alpha}{1-r}\]. More thermal energy is also produced. My hypothesis is based on my observation of balls that are not well inflated. This is because it is easiest as the figure read of the meter rule is the result. A ball falls from a height of 6 metres. his the height of the balls bounce. The ball did not reach terminal velocity however as it did not have enough time to accelerate to its terminal velocity. You measure this response, or record data, in a table for this purpose. The reason for our error was that we thought that the tennis ball might be specially made to bounce to the same height.
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