We felt the magic immediately. Dependent Variable: The Bounce (How height is the ball going to Bounce) because of the Materials:-Carbon Paper-Goggles-Golf WebThere are many different variables that would affect the bounce height of a ball. Your assistant will record the bounce. The coefficient of restitution is the ratio of the final to the initial relative speed between two objects after they collide. Kinetic energy is energy of motion. This will be repeated five times, possibly more (for accuracy), for each height and the top and bottom results will be discounted. As it did so the downward force was partially balanced out by the upwards force of drag, increasingly so the closer the ball got to its terminal velocity. However the conditions were kept the same for each drop of the ball. TurnItIn the anti-plagiarism experts are also used by: King's College London, Newcastle University, University of Bristol, University of Cambridge, WJEC, AQA, OCR and Edexcel, Business, Companies and Organisation, Activity, Height and Weight of Pupils and other Mayfield High School investigations, Lawrence Ferlinghetti: Two Scavengers in a Truck, Two Beautiful People in a Mercedes, Moniza Alvi: Presents from my Aunts in Pakistan, Changing Materials - The Earth and its Atmosphere, Fine Art, Design Studies, Art History, Crafts, European Languages, Literature and related subjects, Linguistics, Classics and related subjects, Structures, Objectives & External Influences, Global Interdependence & Economic Transition, Acquiring, Developing & Performance Skill, Sociological Differentiation & Stratification. What you have learned may allow you to answer other questions. As the ball flattening upon impact with the floor is not visible as it happens so quickly it would be almost impossible to measure the size of the ball on impact with the floor. Dependent: - Height at which the tennis ball bounces. Materials: -Carbon Paper -Goggles -Golf Balls This denting extracts energy from the balls motion and stores much of it in the elastic surfaces of the floor and ball. Control Variable: Simple Definition - Statistics How To This will be a table tennis ball. As drag is a squared function, proportional to the square of the velocity, it is impossible to calculate the velocity that the ball hits the floor at. As there is more KE, more energy is converted into elastic potential energy, As there is more elastic potential energy, more energy is converted back into KE energy. So if we double the release height, we will get double bounce height. Use the same point on the ball (top) or (bottom) when judging both the height of the drop and the height of the bounce. This calculation is shown in the data analysis section above. Please note that many online stores for science supplies are managed by MiniScience. " Hence the formula for the sum of the infinite number of terms can be rewritten as seen here. 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. Often, mathematical equations can be made from graphs. This slope tells us how bouncy the ball is. The acceleration due to gravity causes the ball to change direction and start moving downwards at stage 2. h1and h2are 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. , v is greater therefore KE is greater by a larger amount). As in both cases the main form of energy is GPE it follows that the higher the ball is dropped from, the higher the ball will bounce. This proves that the higher h1the more h2will differ from the height that the ball would have reached had it been dropped in a vacuum. Use a racquetball, a golf ball or any kind that bounces well and makes a nice crisp sound when it bounces. The coefficient of restitution is the ratio of the final to initial speed between two bodies after the collision. Yes, as the ball is oscillating about the equilibrium position (in height) and goes back to its initial position after a period of time. Conveniently enough, this fraction of returned energy is nearly independent of how much energy the ball had to begin with. will differ from the height that the ball would have reached had it been dropped in a vacuum. Experiment 2 is for testing the effect of air pressure. For a dropped ball, the total mechanical energy is defined as the sum of its kinetic energy and its gravitational potential energy. Using the graph above, we can find the displacement by using the area under the graph, which is equal to the displacement. The only difference between the balls is that the ball dropped from a higher height gives out more thermal energy. With no net force, the acceleration = 0 and the ball falls at a constant velocity. This is a sample on how to write the results, conclusion and make charts. In this experiment there are FOUR VARIABLES. h1 = The distance between the bottom of the ball before it is dropped and the ground. I plan to collect at least ten results as this will make the conclusion and graph I am able to draw from the experiment more accurate than if I had less results than ten. For the higher heights the distance from h1 to h2 was almost a meter which meant it was difficult to get eye level from h1 to h2 to accurately in a short amount of time. When the ball rebounds, its stored energy reappears and it leaps higher into the air than it would have had you dropped it a shorter distance. Read books, magazines or ask professionals who might know in order to find out the factors that affect the movements of a dropped ball. They identify variables to be changed, measured and controlled. A bouncing ball is an example of oscillatory motion as the ball is oscillating about the equilibrium position. Therefore the results are valid. 1. Changes in air pressure could have affected results as could changes in temperature however changes in these two factors would have been small; air pressure would not have changed enough to affect the results in the hour period in which the experiment was conducted, and although the rooms temperature may have increased by a degree or two, due to body heat, over the course of the period temperature was not a major factor that affected the height to which the ball bounced and would not have significantly affected the results. \[S_{\infty} = \frac{\alpha(1-r^{\infty})}{1-r} = \frac{\alpha(1-0)}{1-r} \qquad S_{\infty} = \frac{\alpha}{1-r}\]. Either the coefficient to restitution that was worked out is incorrect, which would mean that the first three results are inaccurate or subsequent results were inaccurate. Bounce/Release is the relation of bounce height to the release height. What purpose does a control serve? By the time the ball comes briefly to a stop, most of its missing energy has been stored in its dented surface. Bouncing Ball This can either be assumed and chosen, or it can be stated in a question.). 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 ball has reached its terminal velocity and cannot fall any faster (unless dropped in a vacuum). The mass is cancelled out in the above equation, and we re-arrange with respect to velocity. Aim:To find out what affects the height to which a ball bounces. This would allow one to find the terminal velocity of the ball. A controlled variable is one which the researcher holds constant (controls) during an experiment. (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.) These two results were excluded when averages were being calculated and therefore the average variation between results used for calculating the average was even less than 3cm. List three. Is a bouncing ball an example of simple harmonic motion? The selection of balls for official games in most sports (esp. The more particles per cubic meter, the more drag acting upon the ball. For the lower heights the flight time of the ball was extremely short and again it was difficult to move ones head over the distance from h. Do a larger amount of results; 1cm, 2cm, 3cm, 4cm etc. Kinetic energy means energy associated with motion. At the terminal speed, the drag force = the gravitational force. The format you use to write your bibliography may look like this: Are you ready for more advanced ball drop projects? Controlling Variables Part 1 ( Video ) | Chemistry | CK-12 Foundation It is always important for students, parents and teachers to know a good source for science related equipment and supplies they need for their science activities. Choose one of the variables you listed in #4, and design an experiment to test it. For this reason, its also known as a controlled variable or a constant variable. Drag is a squared function of velocity and therefore as the ball drops drag increases a greater amount each second. Studying tables and graphs, we can see trends that tell us how different variables cause our observations. Problem: Hypothesis: Experiment: A series of experiments that includes a control is called a controlled experiment.. Bouncing Ball Lab - Warren County Public Schools This will help with your understanding of the investigation and lead you to make a possible hypothesis. Grammar mistakes. Variables Independent variable = drop height Dependent variable = bounce height Controlled variables = ball, surface, measuring tool. This produces a different amount of response in the system. To do that use the scroll button to start, then use arrow keys to move your wave 0.1 second left or right. Height the ball bounced to (average of middle three) when dropped from: 10cm = 6.7 6.7 = 66% of 10 (to the nearest percent), 20cm = 14.0 14.0 = 70% of 20 (to the nearest percent), 30cm = 22.3 22.3 = 74% of 30 (to the nearest percent). It is used to determine what the variable changed. The experiment was conducted well however as the utmost efforts were brought into place to avoid parallax error and it was ensured as far as possible that factors that affected how high the ball bounced, excluding the height, were kept constant throughout the experiment. For an experiment to give answers you can trust, it must have a control. A control is an additional experimental trial or run. This means that not all the GPE is converted into KE as it would have been if the ball had been dropped in a vacuum. Click Create Assignment to assign this modality to your LMS. C) Frozen tennis balls will not bounce as high. WebPhysics Lab 1 - Bouncing Ball - Hardik December 2019 PDF Bookmark This document was uploaded by user and they confirmed that they have the permission to share it. You are NOT going to perform this experiment. Review each step of the procedure to find sources of potential errors. If the drag is less the ball will fall faster and is less likely to reach its terminal velocity. Hold the ball at 6 feet height and release it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. h2= The distance between the bottom of the ball at the top of its arc after bouncing and the ground. Constants: the same person takes all of the measurements, the same materials are used in every trial. We have a new and improved The CoR can be measured directly by velocity measurements but often it is handier to measure the height of rise of the ball after it bounces relative to the height that it fell. If you did not observe a consistent, reproducible trend in your series of experimental runs there may be experimental errors affecting your results. Controlled Variables: Bouncy ball used, surface bounced off of, technique in which ball was dropped (initial height was measured from base of ball). This means that the faster that the ball travels the larger the force of air resistance upon it. The surface onto which the ball is dropped upon will be kept the same. Balls Bouncing Off of Surfaces Your assistant will record the bounce. At the point of maximum height, the ball momentarily has zero velocity, and the direction of velocity is changing from positive to negative. A totally accurate experiment would have a variation between results equal to zero however an experiment that is totally accurate needs to be conducted under conditions where air pressure and temperature remained constant, error produced by the ball falling on different parts of the linoleum floor tile (which was not totally even and thus produces inaccurate results) and human error removed by dropping the ball onto a uniform surface and using machinery to record the height to which the ball bounced to.
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