would bounce the highest on a hard, smooth concrete surface because a rubber ball According to the USTA regulations ball is tested for bounce by dropping it from a height of 100 inches (2.54 m) onto ; a bounce between 53 and 58 inches (1.3462 - 1.4732 m) is acceptable. Will the air pressure change the bounciness of a 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 h1 to h2 in order to obtain accurate results. Drag is a squared function of velocity and therefore as the ball drops drag increases a greater amount each second. If you want to make the ball bounce lower, you can try cooling it down by putting it in the fridge or freezer for a few minutes. Drag is a squared function of velocity and therefore as the ball drops drag increases a greater amount each second. The steel snaps back more quickly when it hits the ground. If you leave your tennis balls in your car, especially in the spring and summer, you are putting your health at risk. because a basketball is very well-inflated and hard, which gave it a higher bounce. The cookie is used to store the user consent for the cookies in the category "Performance". (Doherty, 1991). Therefore the height that it reaches is less high. You may print and distribute up to 200 copies of this document annually, at no charge, for personal and classroom educational use. Changes in the area of linoleum floor tile that the ball collided with may have affected the height to which it bounced to thus producing variation between results. The first independent variable that will be tested. Increased energy and movement results in a bounce. Record the new pressure reading in your data table and repeat steps 4 and 5. Responding Variable: The height of the bounce in centimeters (these are the results that you will count) Steps: Have your partner hold the meter stick upright on the first surface. When printing this document, you may NOT modify it in any way. But opting out of some of these cookies may affect your browsing experience. We could have improved this However, you may visit "Cookie Settings" to provide a controlled consent. The bounce of the ball is a major factor in the game of tennis. Therefore the energy that the ball hits the floor with = mh, The proportion of energy lost when ball hits the floor = The Coefficient to the restitution of the two objects (C, All of the energy that the ball leaves the floor with is converted back into GPE, If dropping a ball in a vacuum all you need to know in order to know how high the ball will bounce to is h, can be found out by looking at a graph, the gradient, as a percentage of 1 gives the amount of energy conserved and therefore C. The clamp stand will be clamped down to the desk using a g-clamp to prevent it falling over and causing possible injuries. Concrete will help bounce a ball the highest as it's hard and balls and surfaces will ultimately be the best combination for bouncing a ball high. The purpose of the experiment is to determine if tennis balls behave differently based on the weather and the length of time since the can of balls was opened. During the research fraction of the experiment, it was Balls lose up to a gram even after minimal use (if 30 bounces and throws by a ball machine count as minimal). Balls change shape during play. Balls bounce up to 5 . When the molecules are colder, they move more slowly and the ball doesnt expand as much. Which surface bounces a ball the highest? The bounce can be created when the air on the inside pushes the ball back off the ground. "Under Pressure: Ball Bouncing Dynamics.". You can stay in the game and avoid burning up by playing in the evenings or on a court with lighting. From dropping the ball we can see how high the ball will bounce to after having a loss or gain of energydue to sound or movement of the ball as it hits a hard surface. Hypothesis: if different balls are bounced on different surfaces, then a rubber ball It might be a good idea for students to experiment with a variety of balls to determine which one is most effective. METHOD: 1. concrete, in which we were incorrect. Bouncing is what makes playing with a ball so much fun. This means that the higher h1the more h2will differ from the height that the ball would have reached had it been dropped in a vacuum. were able to construct a successful experiment. rubber ball would bounce the highest on concrete. The tennis balls bounce in different ways. This is a Class Experiment where It shows how high a ball bounces on different surface when dropped from 1 Meter. The exact interval will be determined after the preliminary experiment, as will the number of heights that the ball will be dropped from. 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. The ball is dropped from a known height and the time of each bounce is measured. Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01. . ping pong 2 cm 3 cm 2 cm 2 cm, basketball 82 cm 84 cm 80 82 If you know that it will be freezing, you can adjust the tension of your string. For any other use, please contact Science Buddies. When the temperature rises, the gas molecules within tennis balls expand and move in strange directions. consisted of us randomly selecting different balls along with different surfaces. The higher the ball goes, the more GPE it ends up with. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Apparatus:Clamp stand, meter rule 2, table tennis ball, desk. Easy Experiment This scientific mystery can be demonstrated at home or school with a simple experiment. This did not happen in my experiment however. This still took us time and we still couldn't catch the Then draw a line to connect the dots. This would allow one to find the terminal velocity of the ball. When the ball is pulled toward the ground, gravity slows it down so that it doesn't bounce as many times. 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. . Take your class outside, to an area with a smooth, flat surface. Warm up the ball before it is used to increase its bounce. energy a surface absorbs, the more of it will remain for a ball to bounce. 1. GPE=Mass (kg) Gravitational Field Strength (N/Kg) Height (m). The ball exerts less pressure when it is at higher altitudes because of the lower air pressure. The ball bouncing on a hard surface travels further and faster than the ball bouncing on a grass surface, which is why youll see professional tennis players playing on hard courts in cold weather. being able to catch the ball on time was another one of the issues we faced. 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. Also the difference between the force of air resistance acting upon a ball travelling at 1ms, and the force of air resistance acting upon a ball travelling at 2ms, is far smaller than the difference between the force of air resistance acting upon a ball travelling at 20ms, and the force of air resistance acting upon a ball travelling at 21ms, , the faster the velocity that the ball reaches. 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. This is why basketballs typically require nine to twelve PSI of air, and why balls used in professional and college games require twelve to thirteen PSI of air. Why do marbles bounce so high? It is also necessary to warm a ball, because the energy inside it is released. 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. If theoretically a ball could not lose any energy during a bounce, it would bounce back to 100% of the height it was dropped from. 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. When the ball deforms, its molecules are stretched apart in some places and squeezed together in others. Push it against the measuring tape, careful to keep it at the same height. Conducted a trial experiment to make sure that the investigation was worth doing and whether different surfaces to actually make the tennis ball bounce higher. The average variation between results was 3cm. What do you think this means about your results? the higher it popped up into the air. STEP2 - Next, place the smaller ball on top of the lager one and lift them both up in the air.. STEP3 - Drop em'!. concur, which was catching the small balls. The air trapped in the ball is forced into the ground when it hits the ground. Hard court tennis demands a lot from your joints! Then when it bounces up, it returns to its original shape. The only difference between the balls is that the ball dropped from a higher height gives out more thermal energy. Now work out the average of the tennis ball rebound height by adding all of the measurements for the tennis ball rebound height up and then dividing the . Fully pump up the basketball and check the pressure with the pressure gauge. High bounce ball 2. These both support my prediction and show that my prediction was correct. Does it slope up or down? A glass ball will bounce higher than a rubber ball if it doesnt break. Most of the points on grass are very short. Note whether the ball and surface showed more of an elastic or inelastic collision. This is due to two factors. This also proves the accuracy of the experiment. Place the video camera on a level that will be able to clearly record the experiment, whilst a person sits beside the tape measurer 4. 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. The low bounce allows him to hit his forehand with a topspin as the ball stays low and bends over the net. A decrease in bounce is caused by a colder temperature. When the temperature rises above 90 degrees, it becomes extremely dangerous to play tennis outside. Improvements that could be made to the experiment if future work was to be done: To provide additional relevant evidence I would conduct further work as follows; I would like to conduct the same experiment in a vacuum. To find out what affects the height to which a ball bounces. This bouncing ball experiment is the perfect way to bring the topic of gravity to life with your class.
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