Drag is a squared function of velocity and therefore as the ball drops drag increases a greater amount each second. The ball did not reach terminal velocity however as it did not have enough time to accelerate to its terminal velocity. When the ball was dropped from the higher heights the ball began to show signs of reaching its terminal velocity before it reaches the ground. By the time it reaches the floor, the ball is traveling quickly and it hits the floor hard. The formula for kinetic energy is KE=1/2 mv 2 , where m is the mass in kg and v is the velocity in m/sec 2 . Discuss specifically how you developed your e and initial height values. Even a specific ball may bounce different heights at different times or different locations. Stop procrastinating with our study reminders. It goes back to its initial vertical position after a period of time. A ball falls from a height of 3 metres. 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. Test your knowledge with gamified quizzes. C) Frozen tennis balls will not bounce as high. The force that is received by the ball from the ground from the collision causes it to rebound, which converts the potential energy to kinetic energy. The higher the ball goes, the more GPE it ends up with. The purpose of our lab was fulfilled. A ball that is dropped in air however is subjected to air resistance which affects the height to which it bounces. The Particular experiment is about : How does the drop height of a ball affects the bounce height of the ball. Drag is a squared function of velocity and therefore as the ball drops drag increases a greater amount each second. The energy that the ball hits the floor with is kinetic energy. Grammar mistakes. 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. When you think you know what variables may be involved, think about ways to change one at a time. What is the control variable in the bouncing ball experiment? Your assistant will record the bounce. where m is the mass of the moving object, and v is the velocity of the moving object. The second stage is the point at which the ball decelerates, changes direction once it has reached the peak point, and starts falling to the ground. WebThere are many different variables that would affect the bounce height of a ball. Also the ball flattening upon impact doesnt have to be taken into account whereas if one was measuring from the top of the ball as it hits the floor to the top of the ball before dropping it or at the top of its arc after bouncing or the middle of the ball as it hits the ground to the middle of the ball before dropping it or the middle of the ball at the top of its bounce then the fact that the ball flattens momentarily on impact with the floor would have to be taken into account. Therefore the ball goes higher. Is a bouncing ball an example of Newton's third law? Finally, we need to multiply the distance found by 2, as one bounce of the ball includes both a rise and fall. Our dependent variable was. When a ball drops in air there is air resistance to which the ball loses energy in the form of thermal energy. 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. WebHave them list all the variables they think will affect ball bounce. 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. \[S_{\infty} = \frac{\alpha(1-r^{\infty})}{1-r} = \frac{\alpha(1-0)}{1-r} \qquad S_{\infty} = \frac{\alpha}{1-r}\]. For instance result 3 from 200cm was an anomaly but was not taken into account when taking the average of the middle three. The more energy that the ball possessed before being dropped, the more energy was converted into KE while the ball fell. Bouncing Ball Experiment - GCSE Science - Marked by Preparation: Draw a ruler with high visibility on a roll of paper about 8 inches wide and 6 feet tall. 70% is retained. 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. Independent Variable: The height from which the ball is dropped. In the bouncing ball example, external forces such as air resistance are assumed to be zero. The coefficient of restitution is the ratio of the final to initial speed between two bodies after the collision. Bouncing balls experiment Another experiment would be necessary to determine this for certain. 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. This is Newtons Third Law of Motion- for every action there is an equal and opposite reaction. WebAll experimental investigations involve variables. Its 100% free. It shows that heights were recorded that exceeded the height that the ball would have reached had it been dropped in a vacuum. it seems the ball is experiencing an oscillatory motion. Sign up to highlight and take notes. Your challenge will be to find a way to determine your balls e, and the initial height of the ball when you first dropped it. = The distance between the bottom of the ball before it is dropped and the ground. Hypothesis: Based on your gathered information, make an educated The ball then rebounds: it undents and tosses itself up into the air to a good fraction of its original height. This will be repeated five times, possibly more (for accuracy), for each height and the top and bottom results will be discounted. 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. 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. 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. Instead, as the ball is still always loosing GPE so long as it is still falling, all GPE is converted into thermal energy. Bouncing Ball Lab - Warren County Public Schools 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. 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 Purpose The bounce of a dropped ball has a direct relation with the air pressure inside the ball. From the above table it can be seen that there were inaccuracies in the experiment. The higher h1, the faster the velocity that the ball reaches. Is the measurement method questionable or unreliable? Several smooth hard flat horizontal surfaces suitable for bouncing ballsfloors, lab tables, sidewalks, and the like. The longer it takes to stop, the higher it bounces to. his the height of the balls bounce. Find the infinite distance of travel. Aim The aim of this experiment is to investigate the efficiency of a bouncing ball, and the factors which affect its efficiency. Repeat this test from 2 ft, 3 ft, and 1/2 ft. Do this test for each ball and record data. When a player dribbles a basketball, as Kobe Bryant does here on the 2012 U.S. men's Olympic team, the ball actually transfers some of its energy on each Tape the ruler to the wall. 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. The WebThere are many different variables that would affect the bounce height of a ball. The balls are shown at rest, about to bounce back up. The acceleration on the ball is the acceleration of gravity, which acts downwards on the ball. The area of the triangle can be found using the formula below. GPE also changes as the ball falls. As gravity remains the same the amount of work acting on the ball remains the same (apart from slightly more air resistance due to the ball travelling faster and so hitting more air particles per second, but the effect of this is negligible) and the ball travels further before stopping. The push which the ball receives from the floor at the moment of impact causes it to bounce up from the surface. 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 Effect of Dropping a Bouncy Ball from Different Heights on The motion of the ball can be described using velocity, displacement, and acceleration graphs, or geometric sequences. Variables - Working scientifically - KS3 Science - BBC Bitesize Controlled Variable We use the conservation of energy. 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. The exact interval will be determined after the preliminary experiment, as will the number of heights that the ball will be dropped from. changing air density, temperature The surface onto which the ball This means that the faster that the ball travels the larger the force of air resistance upon it. This is also reflected in the velocity graph; the velocity is at its maximum at the minimum displacement and goes through zero at its maximum heights. Using the slope and graph, we can estimate that the ball would bounce to 0.75 m if dropped from 1.5 m and bounce to 1 m if dropped from 2 m. It is difficult to say with certainty that a ball dropped from 100 m would bounce to 50 m. That is because the heights we dropped the tennis ball from were all under 1 m, and at a much greater distance there may be other factors that would contribute to the bounce height. Its height gradually decreases until it eventually stops moving. The dependent variable is how high the ball bounces. Control variables include the type of ball, the surface that it is dropped onto and the size of the ball. 3. Testing reaction times can be investigated by dropping a ruler and seeing how quickly someone can grab it. The independent variable is the person who is trying to catch the ruler. List three. Draw a graph of bounce height Vs drop height. A control variable is any factor that is controlled or held constant during an experiment. This can be in the form of a table of processed numerical data, or graphs. 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. These polymers are tangled together and stretch upon impact. Hold the ball at 6 feet height and release it. 2. A ball falls from 8 metres and rebounds to 52 percent of its previous height. This help to greatly increase the accuracy of the experiment. When raw data gets processed mathematically, for example, it becomes results. You will be able to precisely measure the time intervals between bounces. Its high order and functions achieved with differential and integral operations can't fit any circle, because circles must cover constant speed in simple harmonic motion. External factors, i.e. Additional list of material can be extracted from the experiment section. If the coefficient to restitution = 0.7, a ball dropping from h1in a vacuum would reach the height of 0.7 h1 after bouncing.
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