The ball weighs exactly 2.5g. The acceleration due to gravity causes the ball to change direction and start moving downwards at stage 2. As the ball hits the floor with less KE than it would have done if it had been dropped in a vacuum it follows that less energy is converted into elastic potential energy and back into KE again. Bounce/Release is the relation of bounce height to the release height. Using the trends in your experimental data and your experimental observations, try to answer your original questions. 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. ", " My husband and son came with me for the tour. Ramp and ball, controlled study lab report What Is The Control Variable In The Bouncing Ball Experiment? It depends only on the elasticity of the ball itselfa super ball returns a large fraction while a beanbag returns a tiny fraction. 2. The higher h1, the faster the velocity that the ball reaches. Bouncing balls AT (Year 8 Course of Theoretical Physics : Mechanics (Course of Theoretical Physics), Engineering Mechanics Dynamics (11th Edition). This would allow one to find the terminal velocity of the ball. How well a ball bounces deals with its coefficient of restitution. This is why it h2will be 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. This is Newtons Third Law of Motion- for every action there is an equal and opposite reaction. Several meter sticks for measuring the height of the bouncing ball or drawing a larger meter stick. A ball falls from 8 metres and rebounds to 52 percent of its previous height. A control variable is any factor that is controlled or held constant during an experiment. As the height from which the ball was dropped from was increased, the GPE energy that the ball possessed before being dropped also increased. Additional list of material can be extracted from the experiment section. An alternative method would be the measuring person holding a video camera level with the approximate height that the ball reaches after bouncing and videoing the ball reach the top of its arc. Also it shows inaccuracies in the experiment as it shows that heights were recorded that exceeded the height that the ball would have reached had it been dropped in a vacuum. Read books, magazines or ask professionals who might know in order to find out the factors that affect the movements of a dropped ball. 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. At the lowest point, the ball has its minimum potential energy, and the velocity changes from negative to positive. It is used to determine what the variable changed. The material ball is made from will affect the ball as if it is smooth then the drag will be significantly less than if it is rough. Therefore any change to the height from which the ball starts with affects the height to which it bounces to. Lerne mit deinen Freunden und bleibe auf dem richtigen Kurs mit deinen persnlichen Lernstatistiken. Bouncing Ball Experiment Our simple experiment is to drop a ping pong ball weighed at 3 grams from a height of 1 metre then 90cm, 80cm, 70cm, For the higher heights the distance from h, was almost a meter which meant it was difficult to get eye level from h, to accurately in a short amount of time. Variables are Set individual study goals and earn points reaching them. WebThere are many different variables that would affect the bounce height of a ball. Without a control you cannot be sure that changing the variable causes your observations. The motion of the ball can be described using velocity, displacement, and acceleration Drop a ball from 1 foot off of the floor, slightly in front of a yardstick. This slope tells us how bouncy the ball is. It is the most basic kind of energy. Physics Ia on Bouncing Ball A) Using the graph above, find the displacement of the ball at 50 seconds. You may now be able to understand or verify things that you discovered when gathering information for the project. When dropped on a solid surface, not even a super ball bounces back as high as its initial height, but some balls do bounce a lot better than others. If you follow the motion of either ball, youll realize that theres a moment halfway through its bounce when the ball is perfectly motionless in contact with the floor. At the terminal speed, the drag force = the gravitational force. Tape the ruler to the wall. Charged Particle in Uniform Electric Field, Electric Field Between Two Parallel Plates, Magnetic Field of a Current-Carrying Wire, Mechanical Energy in Simple Harmonic Motion, Galileo's Leaning Tower of Pisa Experiment, Electromagnetic Radiation and Quantum Phenomena, Centripetal Acceleration and Centripetal Force, Total Internal Reflection in Optical Fibre. WebOn the cardboard, mark the starting point, the point where the marble strikes the wood, and a point along the marble's path as it rolls away from the wood. Materials: -Carbon Paper -Goggles -Golf Balls 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. Removing the maximum and minimum results and taking an average of the middle three results also provided more accurate results. Air resistance exists but does not affect the velocity of the ball significantly. 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. To set up the 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. Hence the formula for the sum of the infinite number of terms can be rewritten as seen here. What is the velocity of the ball at the point of maximum height? The control variable is not part of an experiment itselfit is neither the independent nor dependent variable but it is important because it can have an effect on the results. This would provide evidence on how the height from which the ball is dropped from affects the height to which it bounces without air resistance. the Scientific Method What is the dependent variable in the bouncing ball experiment? In a real-life scenario, the ball will eventually stop moving due to external forces such as air friction. 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. We also noted after we finished the experiment that the student taking measurements sometimes stood above the height when taking the measurement and sometimes kneeled on the floor so they had a different angle on the meter stick, which may have affected the measurement. Keep track of where you got your information from. Use two people to measure the results; one person to drop the ball and one to measure the height to which it reaches after bouncing. Therefore of the GPE that the ball possessed at the beginning some energy is given off as thermal energy. In this experiment you will measure the bounce of a dropped ball for different release heights. Experiment 2 is for testing the effect of air pressure. For this reason, its also known as a controlled variable or a constant variable. where g is the gravitational acceleration (9.8 m/ sec 2 at the Earths surface), and where h is the height of the object, measured with respect to any convenient zero- level. Identifying variables is necessary before you can make a hypothesis. So if we double the release height, we will get double bounce height. 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. In the bouncing ball example, external forces such as air resistance are assumed to be zero. Balls Bouncing Off of Surfaces Therefore the ball dropped from the higher height must give out more thermal energy in order to end up with the same amount of energy as the other ball. Repeat this test from 2 ft, 3 ft, and 1/2 ft. Do this test for each ball and record data. Choose one of the variables you listed in #4, and design an experiment to test it. The energy chain is as follows: Therefore as energy cannot be created or destroyed the energy the ball starts with must be directly proportional to the energy the ball finishes with, at the top of its bounce, and so if the ball starts with more energy it must therefore finish with more. WebA bouncing ball in an ideal scenario will continue this oscillatory motion. Control Variable? Definition and Examples Design an experiment to test each hypothesis. These both support my prediction and show that my prediction was correct. Being precise as the we drop the ball from a very big height the ball will bounce back at a very big height by Newton's Air pressure will affect the balls fall slightly as the concentration of air particles per cubic meter varies with air pressure. If you choose to study on the effect of air pressure inside the ball, your variables will be defined like this: Independent variable (also known as manipulated variable) is the balls air pressure. A decrease in h1, assuming g and m stay constant, results in a decrease in m g h1which results in a decrease in GPE. 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. This causes the amplitude of the height to reduce over time and eventually come to a stop due to friction forces like air resistance, which are assumed to be zero in an ideal scenario. The more particles per cubic meter, the more drag acting upon the ball. The relative height of the bounce should be h/h = CoR2 = 0.72 = 0.49. 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. By the time it reaches the floor, the ball is traveling quickly and it hits the floor hard. It provided me with five repeats so that the maximum and minimum results could be discounted and a reliable average could be taken.

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