controlled variables in bouncing ball experiment

In this project we will try to find out what factors affect the bounce of a dropped ball. Questions lead to more questions, which lead to additional hypothesis that need to be tested. A geometric sequence is a progression where each term is related to the previous term, and it is related to the previous term by a number r, which is known as the common ratio of the sequence. The decision for the size of interval and the amount of results collected will depend upon the time taken to conduct the experiment and any other factors that may become apparent during the preliminary experiment. These inaccuracies could have been caused by external factors or parallax error even though efforts were made to avoid parallax error occurring - by dropping the ball one time that was not measured and placing a blob of blue tack onto the meter rule at the approximate height it bounced to. What principle describes the bouncing motion of a ball? The slope of the line in graph 1 was found to be 0.5. 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. About a foot above the table top is plenty. If the drag is less the ball will fall faster and is less likely to reach its terminal velocity. This means it will be travelling the same speed when it hits the ground. Use the pencil and ruler to connect the incoming and outgoing trajectories of the marble to the point where the marble bounced off the wood. While these variables are not the Set individual study goals and earn points reaching them. Create flashcards in notes completely automatically. The force that causes a ball to bounce is the reaction force described by Newton's third law of motion. It was difficult to accurately measure the height of the bounce. Use a uniform surface to drop the ball onto. What Effects the Bounce of a Dropped Ball When you think you know what variables may be involved, think about ways to change one at a time. 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. We have a new and improved So if we double the air pressure, we will get double bounce height. You may need to calculate the average of bounce height. Draw a graph of bounce height Vs drop height. Is a bouncing ball a simple harmonic motion? Make a step-by-step list of what you will do to answer each question. It was decided that the first drop would start at 2m off the floor and then move down in intervals of 10cm to 10 cm off the floor. What purpose does a control serve? The ball weighs exactly 2.5g. The balls finish up with the same amount of energy and the only energy given out is thermal energy. Create and find flashcards in record time. Such variations in the bounce of a dropped ball rise questions that demand some research and investigation. A series of experiments is made up of separate experimental runs. During each run you make a measurement of how much the variable affected the system under study. WebRamp and ball, controlled study lab report. 70% is retained. If you are author or own the copyright of this book, please report to us by using this DMCA report form. The exact interval will be determined after the preliminary experiment, as will the number of heights that the ball will be dropped from. This is in accordance with Newton's second law. So if we double the release height, we will get double bounce height. If you did not observe anything different than what happened with your control, the variable you changed may not affect the system you are investigating. The terminal speed is the maximum speed reached when an object is dropped from a great height. (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.) This denting extracts energy from the balls motion and stores much of it in the elastic surfaces of the floor and ball. A) scientific method. The relative height of the bounce should be h/h = CoR2 = 0.72 = 0.49. An elastic surface such as rubber and a very hard surface such as concrete will result the highest bounce level. For each height repeat the test 3 to 5 times and record the most reliable result. 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. Both potential and kinetic energy have units of Joules (J). The only difference is that no experimental variables are changed. The distance in centimeters from bounce 1 to bounce 2. The mass is cancelled out in the above equation, and we re-arrange with respect to velocity. For each run, a different amount of change in the variable is used. 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. The results of the experiment were obtained with a method that ensured that every drop was under similar conditions which ensured a fair test. The last stage is the point at which the ball has reached its maximum displacement, decelerates, and changes the direction of motion from upwards to downwards. You will be able to precisely measure the time intervals between bounces. Heres an example of an Excel spread sheet that analyzes whats going on: Heres a graph of energy vs. bounce from the spread sheet: Purpose: To determine how high a tennis ball will bounce when dropped from a specific height. As the ball falls it hits against air particles. the Scientific Method A ball falls from a height of 3 metres. 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. Variables - The Tennis ball experiment Based on these trends, we can draw conclusions about the system under study. This list is called an experimental procedure. Therefore the results are valid. Aim:To find out what affects the height to which a ball bounces. The CoRs apply to balls dropped or thrown at a rigid wooden surface. Control Variables: Definition, Uses & Examples - Statistics By Jim When the ball travels in the negative direction (downwards), the velocity can be assumed to be negative. Is a bouncing ball an example of simple harmonic motion? ThatQuiz These polymers are tangled together and stretch upon impact. Your assistant will record the bounce. Air resistance exists but does not affect the velocity of the ball significantly. Specifically, you are tasked to determine: B.) 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 WebA) If a tennis ball is frozen, it won't bounce as high as one that is not frozen. changing air density, temperature The surface onto which the ball The surface onto which the ball is dropped will affect the height to which the ball bounces because for any two objects that collide, the properties of both determine the percentage of the kinetic energy either possesses approaching the collision that is conserved subsequent to the collision taking place (Coefficient to restitution) discounting the effects of air resistance. Variables Independent variable = drop height Dependent variable = bounce height Controlled variables = ball, surface, measuring tool. These balls do not bounce as well as balls with high air pressure. 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. B) Using the conservation of energy, find the velocity of the ball before it hits the ground from a height of three metres. You may now be able to understand or verify things that you discovered when gathering information for the project. Then when dropping the ball again eye level was kept level with the blue tack. In this experiment you will test the bounce of a dropped ball for different surface hardness. WebThis experiment,is an investigation into the maximum height of the bounce of a ping pong ball when it is first released.This is because of the unpredictability of the bounce not always reaching the same height.This we can assume their are many factors effecting the bounce of the ping pong ball.The following experiment will determine how different WebThis experiment,is an investigation into the maximum height of the bounce of a ping pong ball when it is first released.This is because of the unpredictability of the bounce not always reaching the same height.This we can assume their are many factors effecting the bounce of the ping pong ball.The following experiment will determine how different In air considerations have to be taken into account such as air resistance but even so the rough height to which it will bounce to can be predicted before dropping the ball. How well a ball bounces deals with its coefficient of restitution. You will then take your bounces and their respective time intervals to a spread sheet. What Is The Control Variable In The Bouncing Ball Experiment? As the ball is accelerating due to gravity, at 9.81m/s2it is constantly getting faster and therefore the drag force gets bigger and bigger. tennis and baseball) includes the CoR test. Yes, as the ball receives a force from the ground due to collision, which causes the ball to bounce off the ground. Studying tables and graphs, we can see trends that tell us how different variables cause our observations. Parallax error will be avoided by dropping the ball one time that will not be measured and placing a blob of blue tack onto the meter rule at the approximate height it bounced to. We use the conservation of energy. Your assistant will record the bounce. You are now ready to enter your data on a spread sheet and get to work. Have all your study materials in one place. GPE also changes as the ball falls. Repeat this test from 2 ft, 3 ft, and 1/2 ft. Do this test for each ball and record data. At the lowest point, the ball has its minimum potential energy, and the velocity changes from negative to positive. In this experiment you will measure the bounce of a dropped ball for different release heights. When you drop a ball from a greater height, it has more kinetic energy just before it hits the floor and stores more energy during the bounceit dents farther as it comes to a stop. 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 . WebBouncing balls. The results of our experiment show that this probably is not the case. Vacuum pump, rigid plastic cylinder, two large rubber bungs to fit over the two ends of the plastic cylinder, table tennis ball, Two meter stick rulers. Constants: the same person takes all of the measurements, the same materials are used in every trial. For an experiment to give answers you can trust, it must have a control. A control is an additional experimental trial or run. Bouncing Ball will differ from the height that the ball would have reached had it been dropped in a vacuum. WebControlled Variables: Bouncy ball used, surface bounced off of, technique in which ball was dropped (initial height was measured from base of ball). The purpose of our lab was fulfilled. 30% of the energy that the ball hits the floor wit is lost. The equipment necessary to generate these conditions was not available and as a result the results obtained were not one hundred percent accurate. 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. To set up the Often, mathematical equations can be made from graphs. Specially look for parts that discuss the gas pressure and physical properties of gases. Measure the height the ball reaches after the first bounce and record. 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. This causes thermal energy to be given off. WebBouncing Ball Experiment - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Earn points, unlock badges and level up while studying. This is correct unless the ball shows signs of reaching terminal velocity. Data table 2 indicates that on average tennis ball bounced to a lower height than it was dropped from. If you are using windows sound recorder program, you can view the recorded waves with an accuracy of 0.01 second. Find sections related to potential energy, elasticity and springs. Additionally we were able to practice reading a lab, taking data and making a graph. Readings: Carrying out an investigation Therefore the height that it reaches is less high. The most valuable resources for teachers and students. 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. What Effects the Bounce of a Dropped Ball Free Bouncing Ball Experiment Essays and Papers | 123 Help Me It goes back to its initial vertical position after a period of time. 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. A real-life bouncing ball example would experience an oscillatory motion which would gradually lose energy, causing the height of the bounce to reduce over time until eventually, the ball came to a stop. For instance, air resistance would slow down the tennis ball much more when it is dropped from 100 m than when dropped from 1 m. This difference in impact speed would probably affect the bounce height. 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