controlled variables in bouncing ball experiment

Nie wieder prokastinieren mit unseren Lernerinnerungen. These balls do not bounce as well as balls with high air pressure. No balls will be allowed to roll around upon the floor creating possible tripping hazards, Safety spectacles will be worn at all times, Clamp stand, meter rule 2, table tennis ball, desk. The results of our experiment show that this probably is not the case. With no net force, the acceleration = 0 and the ball falls at a constant velocity. D (60%) In this experiment you will drop a ball on a hard surface such as table and record the sounds it makes when it bounces using a computer and any sound recorder program. 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. This will hopefully discount any anomalies automatically and leave us with three accurate and reliable results. What is happening to the balls energy with each bounce? , v is greater therefore KE is greater by a larger amount). As there is more GPE more energy is converted into KE (The ball is going faster, KE=1/2mv. Your assistant will record the bounce. A single experiment may contain many control variables. 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. Several smooth hard flat horizontal surfaces suitable for bouncing ballsfloors, lab tables, sidewalks, and the like. Identify your study strength and weaknesses. WebThe independent variables in the experiment are the heights that the balls are dropped from, the surface that the ball bounces on, the type of ball used, ball is dropped vertically, and that when dropping a ball no force is applied. Find sections related to potential energy, elasticity and springs. 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. Five repeats were done as it was deemed that an average of the middle three was reasonably accurate. The difference between the predicted height and the actual height will provide evidence as to how air resistance affects the flight of the ball. 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. As the ball falls through the air, the Law of Conservation of Energy is in effect and states that energy is neither gained nor lost, only transferred from one form to another. Therefore the height that it reaches is less high. In this experiment the only variable that we modify is the type or flexibility of bounce surface and we keep all other variables unchanged. On a molecular level, the rubber is made from long chains of polymers. 7. Figure 1. The format you use to write your bibliography may look like this: Are you ready for more advanced ball drop projects? WebA bouncing ball in an ideal scenario will continue this oscillatory motion. Create flashcards in notes completely automatically. 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. Preparation: Draw a ruler with high visibility on a roll of paper about 8 inches wide and 6 feet tall. The drag force increases as the ball goes faster. As the ball falls it hits against air particles. WebAll experimental investigations involve variables. Constants are the release height, the bouncing surface, the type and the size of the ball. Choose one of the variables you listed in #4, and design an experiment to test it. Maybe you are reading a scale incorrectly, or maybe the measuring instrument is working erratically. This list is called an experimental procedure. Therefore the coefficient to restitution = 0.7. The distance in centimeters from bounce 1 to bounce 2. Type your answer here: The independent is the variable you change, The dependent variable is the variable you observe to determine the impact of the independent variable, and control variable is the constant, which is something that is assigned a value, and it will not change in the experiment. The results of the experiment were obtained with a method that ensured that every drop was under similar conditions which ensured a fair test. As it falls, the ball converts energy stored in the force of gravitygravitational potential energyinto energy of motionkinetic energy. StudySmarter is commited to creating, free, high quality explainations, opening education to all. It tells us that the ball consistently bounced to half of its drop height. The Graph on page 23 shows that all of the results were very close together. 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. In a real-life scenario, the ball will eventually stop moving due to external forces such as air friction. A ball falls from 8 metres and rebounds to 52 percent of its previous height. Method:The apparatus will be set up as shown: H is the height of the ball before it is dropped. Height will be the variable that we will vary. of the users don't pass the Bouncing Ball Example quiz! = The distance between the bottom of the ball at the top of its arc after bouncing and the ground. Use the same point on the ball (top) or (bottom) when judging both the height 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. Locate the peaks and record the time for each peak. So an imperfect ball loses some energy on each bounce. 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. 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. When the ball collides with the floor, the ball becomes deformed. Air pressure will affect the balls fall slightly as the concentration of air particles per cubic meter varies with air pressure. This will help with your understanding of the investigation and lead you to make a possible hypothesis. Gravitational potential energy means energy that an object has based on where it is located in a gravitational field. The ball showed signs of reaching terminal velocity because the drag force began to approach the force gravity exerts upon the mass of the ball. Hypothesis. Hence, the only force acting on the ball is gravity. If you choose to study on any other variable, following are samples of hypothesis. Ball What are the variables in the ramp experiment? It could also be a written statement of what occurred during experiments. We have a new and improved The Effect of Dropping a Bouncy Ball from Different Heights on In the bouncing ball example, external forces such as air resistance are assumed to be zero. A series of experiments that includes a control is called a controlled experiment.. 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. At 3ft, the basketball bounced 20 inches, the tennis ball bounced. 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. Try to find more information from physics or mechanics books. Soccer Science Fair Project: Air Pressure & Distance - Education The ball pushes on the floor and the floor pushes back on the ball, causing it to rebound. This is because it is easiest as the figure read of the meter rule is the result. What is the velocity of the ball at the point of maximum height? The third stage is the point at which the ball is momentarily deformed, and bounces off the ground in an upward direction until it reaches its maximum height. For an infinite number of turns, another geometric sequence formula can be used. Variables Independent variable = drop height Dependent variable = bounce height Controlled variables = ball, surface, measuring tool. Potential energy is the energy of position, and it depends on the mass of the ball and its height above the surface. There you will find helpful links that describe different types of science projects, scientific method, variables, hypothesis, graph, abstract and all other general basics that you need to know. For a falling object the Coefficient to restitution (C, ) is equal to the velocity squared as the object is travelling at as it leaves the floor (v, ) divided by the velocity squared as it hits the floor (v, If a ball is dropped in a vacuum. If a ball reaches terminal velocity at 20cm from the floor when dropped from 2m, it will reach terminal velocity at 10cm from the floor when dropped from 1.9m. 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. This help to greatly increase the accuracy of the experiment. 3. The only difference is that no experimental variables are changed. Bouncing Ball Experiment A control variable is any factor that is controlled or held constant during an experiment. To set up the This can either be assumed and chosen, or it can be stated in a question.). At the lowest point, the ball has its minimum potential energy, and the velocity changes from negative to positive. I do not believe that any ball will reach terminal velocity in this experiment seeing as the maximum height that they can be dropped from is 2m and, as the ball is quite smooth, I do not believe that it will have enough time to accelerate to its terminal velocity before it hits the floor. To a wider range of results i.e. No, the bouncing ball example is not an example of simple harmonic motion. WebBouncing Ball Experiment - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. In this project we will try to find out what factors affect the bounce of a dropped ball. For example a regulation tennis ball is dropped from about 1 meter. External factors, i.e. The mass of the ball will affect the height the ball bounces to because it affects the balls starting energy. 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. If the mass of the ball is heavier the weight is heavier (weight = mg) and downward force acting upon the ball is greater as well. It is always good to have an explanation for choosing any hypothesis. 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. These stages can also be represented graphically using three plots including a displacement, velocity, and acceleration vs time graph. Therefore the results are valid. This is impossible. Is a bouncing ball an example of potential energy? CR can be found out by looking at a graph, the gradient, as a percentage of 1 gives the amount of energy conserved and therefore CRcan be found without knowing v22or v12. By the time the ball comes briefly to a stop, most of its missing energy has been stored in its dented surface. CoR = coefficient of restitution = (speed after collision)/(speed before collision). Also the difference between the force of air resistance acting upon a ball travelling at 1ms-1 and the force of air resistance acting upon a ball travelling at 2ms-1 is far smaller than the difference between the force of air resistance acting upon a ball travelling at 20ms-1 and the force of air resistance acting upon a ball travelling at 21ms-1. This causes thermal energy to be given off. Will you pass the quiz? Air resistance exists but does not affect the velocity of the ball significantly. This will be a table tennis ball. Kinetic energy is energy of motion. changing air density, temperature. If possible, have a scientist review the procedure with you. GPE also changes as the ball falls. Controlled variables are air temperature, air flow, air pressure where you perform your tests. 2. Air density will not change enough to affect the flight of the ball seeing as all the results will be collected during a brief period on one day. This applies to a ball falling in a vacuum. Hypothesis: Based on your gathered information, make an educated Temperature will not affect the balls bounce either as the experiment will be conducted at room temperature, thus not allowing the floor to get cold and in doing so alter its affect upon the ball on impact. If you are new in doing science project, click on How to Start in the main page. Independent: - Type of surface the tennis ball is dropped on. Earn points, unlock badges and level up while studying. It goes back to its initial vertical position after a period of time. WebLearn how to identify types of variables in a simple experiment with bouncing balls. Is a bouncing ball an example of simple harmonic motion? The CoRs apply to balls dropped or thrown at a rigid wooden surface. - Height at which the This did not happen in my experiment however. The first thing to check is how you are making your measurements. Ramp and ball, controlled study lab report ThatQuiz By the time it reaches the floor, the ball is traveling quickly and it hits the floor hard. Materials: -Carbon Paper -Goggles -Golf Balls However, they only stretch for an instant before atomic interaction forces them back into their original, tangled shape and the ball shoots upward. Controlled Variable

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