It will be vinyl tiling. It pushes downward on the floor and the floor pushes upward on it. ", " My husband and son came with me for the tour. At the moment of impact, the ball also experiences deformation and the coefficient of restitution, which depends on the bounciness of the ball. Gravitational potential energy means energy that an object has based on where it is located in a gravitational field. WebVariables. You are now ready to enter your data on a spread sheet and get to work. The higher the ball goes, the more GPE it ends up with. Controlled: - Same ball. The last term is also known as the nth term of a geometric progression; n is the number of terms and a is the first term while Sn is the sum of the terms in the sequence as shown in the equation below. We felt the magic immediately.". The acceleration on the ball is the acceleration of gravity, which acts downwards on the ball. Studying tables and graphs, we can see trends that tell us how different variables cause our observations. The ball did not reach terminal velocity however as it did not have enough time to accelerate to its terminal velocity. Yes, as the ball receives a force from the ground due to collision, which causes the ball to bounce off the ground. 2. tennis and baseball) includes the CoR test. This would mean that one could re-examine the height to which it bounced to and find it exactly instead of having to make a split second judgement which is not half as accurate. As elasticity and hardness decreases, part of the ball energy will be used to permanently dent or misplace or vibrate the surface, so ball will have less energy to bounce. Grades: Preschool and K-2 Length of Lesson: Approximately 45 minutes Related Video: The Hawk Factor episode Learning Goals: This means that the faster that the ball travels the larger the force of air resistance upon it. Create beautiful notes faster than ever before. Earn points, unlock badges and level up while studying. The coefficient of restitution is the ratio of the final to initial speed between two bodies after the collision. The equipment necessary to generate these conditions was not available and as a result the results obtained were not one hundred percent accurate. Constants are the release height, the bouncing surface, the type and the size of the ball. Height will be the variable that we will vary. Writing Quality. This is because the experiment is a very short and simple one to carry out and if conducted efficiently can be completed easily within the time span allowed for collecting evidence. 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. This applies to a ball falling in a vacuum. To do that use the scroll button to start, then use arrow keys to move your wave 0.1 second left or right. Several balls, medium-sized super balls, hollow rubber balls, solid rubber balls, tennis balls, golf balls, baseballs, and whatever other types of balls are available. The ball rebounds to 72 percent of its previous height and continues to fall. Hypothesis: Based on your gathered information, make an educated As a general rule, when the ball is travelling in the positive direction (upwards), the velocity can be assumed to be positive. 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. (Their ideas might include surface texture, colour, size, what its made of, squashiness, opacity, weight, air pockets, temperature, cost, shininess/dullness, hardness/softness, age, layers of materials.) Use a uniform surface to drop the ball onto. The results of the experiment were obtained with a method that ensured that every drop was under similar conditions which ensured a fair test. Measure the height the ball reaches after the first bounce and record. This is because it is the easiest and quickest variable to alter. This causes thermal energy to be given off. KE = 1/2mv where m = mass and v = velocity, 1/2mv = mhg - thermal energy (lost as a result of drag). Our lab group was able to determine the relationship between drop height and bounce height. Also it will affect its bouncing properties. These are illustrated below. \[S_{\infty} = \frac{\alpha(1-r^{\infty})}{1-r} = \frac{\alpha(1-0)}{1-r} \qquad S_{\infty} = \frac{\alpha}{1-r}\]. Perform this test in a Gym or anywhere else where you have a hard surface and an accessible wall. Therefore the height the ball bounces will be proportional to the height that the ball is dropped from up to a certain point, where the ball begins to show signs of reaching its terminal velocity before it reaches the ground. 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? If the ball is elastic in nature, the ball will quickly return to its original form and spring up from the floor. H is the height of the ball before it is dropped. After the ball reaches terminal velocity, no more GPE is converted into KE is the ball cannot get any faster. This will hopefully discount any anomalies automatically and leave us with three accurate and reliable results. Variables are his the height of the balls bounce. My hypothesis is based on my observation of balls that are not well inflated. I called School Time and my husband and son came with me for the tour. If the common ratio of the sequence is between 0 and 1, then the term r would approach zero. Procedure: One group member drops a tennis ball from a specific height, while the other group member notes how high the ball bounces. It provided me with five repeats so that the maximum and minimum results could be discounted and a reliable average could be taken. Therefore the results are valid. 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. However, the tennis ball we used may be a very old one, and to definitely prove that our hypothesis is wrong for most tennis balls we would need to repeat the experiment with many different tennis balls. Materials:-Carbon Paper-Goggles-Golf Once the ball hits the ground, its displacement is momentarily zero. The purpose of our lab was fulfilled. With no net force, the acceleration = 0 and the ball falls at a constant velocity. Then when dropping the ball again eye level was kept level with the blue tack. This means that the higher h1the more h2will differ from the height that the ball would have reached had it been dropped in a vacuum. the initial height of your ball when you released it. http://wings.avkids.com/Curriculums/Tennis/index.html. You will need an assistant, so one person will drop the ball and the other person stands about 20 feet away and records how high it bounces. The same square of tiling will be used throughout the experiment so that inconsistencies between different floor tiles do not affect results. Thus a typical ball bounces to 60% of its original height because it stores and returns 60% of the energy it had before the bounce. Therefore the energy that the ball hits the floor with = mh, The proportion of energy lost when ball hits the floor = The Coefficient to the restitution of the two objects (C, All of the energy that the ball leaves the floor with is converted back into GPE, If dropping a ball in a vacuum all you need to know in order to know how high the ball will bounce to is h, can be found out by looking at a graph, the gradient, as a percentage of 1 gives the amount of energy conserved and therefore C. The clamp stand will be clamped down to the desk using a g-clamp to prevent it falling over and causing possible injuries. The controlled variables in this experiment are the surface the ball is rolling on, the material the ball is made of, the size of the ball, the measuring devices being used, the distance the ball travels, and the method being used to release the ball each time, for example the position of the hand. Use a racquetball, a golf ball or any kind that bounces well and makes a nice crisp sound when it bounces. For a falling object the Coefficient to restitution (CR) is equal to the velocity squared as the object is travelling at as it leaves the floor (v22) divided by the velocity squared as it hits the floor (v12): If dropping a ball in a vacuum all you need to know in order to know how high the ball will bounce to is h1 and CR. Both potential and kinetic energy have units of Joules (J). Method: To set up the The positive and negative directions must be stated in each example. For example, we could have used a ruler on the top to help us read how high up the tennis ball bounced, and we could have made sure the partner taking measurements did so from a consistent height. 30% of the energy that the ball hits the floor wit is lost. , v is greater therefore KE is greater by a larger amount). The ball did not appear to reach its terminal velocity which also supports my prediction. This list is called an experimental procedure. where m is the mass of the moving object, and v is the velocity of the moving object. Review each step of the procedure to find sources of potential errors. The maximum height will have to be less than two meters as that is the maximum height that the equipment allows. The Particular experiment is about : How does the drop height of a ball affects the bounce height of the ball. Then when dropping the ball again eye level will be kept level with the blue tack thus avoiding parallax errors. Prediction reasons for variable control: The height the ball is dropped from will affect the height the ball bounces to due to the energy chain the ball goes through as it is dropped and bounces up again. This is in accordance with Newton's second law. The ball is not performing a simple harmonic motion, as the acceleration is not proportional to the displacement from an equilibrium position. It goes back to its initial vertical position after a period of time. Drop a ball from 1 foot off of the floor, slightly in front of a yardstick. Is a bouncing ball a simple harmonic motion? From this I am able to determine that the experiment was very accurate. Identifying variables is necessary before you can make a hypothesis. Variables are the factors that are changed, measured or controlled. As the ball has less KE and is travelling slower it becomes stationary faster at the top of its arc.
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