This means that not all the GPE is converted into KE as it would have been if the ball had been dropped in a vacuum. 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. h2= The distance between the bottom of the ball at the top of its arc after bouncing and the ground. ping pong 2 cm 3 cm 2 cm 2 cm, basketball 82 cm 84 cm 80 82 This is due to an inelasticity in the energy lost when the ball collides with the ground, as well as the fact that the ball bounces every time it is hit. The surface onto which the ball is dropped upon will be kept the same. The combination of the material properties of a ball (surface textures, actual materials, amount of air, hardness/ softness, and so on) affects the height of its bounce. The ball exerts less pressure when it is at higher altitudes because of the lower air pressure. Friday - 25/04/14 Therefore of the GPE that the ball possessed at the beginning some energy is given off as thermal energy. Section II: Hypothesis. As the ball falls to the surface it has kinetic energy. Prediction reasons for variable control: The height the ball is dropped from will affect the height the ball bounces to due to the energy chain the ball goes through as it is dropped and bounces up again. The variation between results was obtained by taking the minimum result away from the maximum result. When the temperature drops, gas molecules in close proximity. A tennis ball is made of rubber and is covered with felt. For multiple bounces, it's just like dropping the ball again from a reduced height. were able to construct a successful experiment. Reverse Engineering: Ball Bounce Experiment Hands-on Activity Reverse Engineering: Ball Bounce Experiment (2 Ratings) Click here to rate Quick Look Partial design process Grade Level: 4 (3 - 5) Time Required: 1 hours 45 minutes (2 or 3 class periods) Group Size: 3 Subject Areas: Students investigate balls and their bounce copyright Summary Hypothesis: if different balls are bounced on different surfaces, then a rubber ball would bounce the highest on a hard, smooth concrete surface because a rubber ball is well-inflated and made of rubber which would give it more kinetic energy and less air resistance. chose balls and surfaces with different hardnesses, textures and compositions in We did this by bouncing different types of balls 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. Therefore, harder surfaces will ultimately bounce a ball higher. It would also be fun to explore the effect of different surfaces on the bounce of the bouncy ball. Balls bounce high, allowing players to dictate how much spin they want to put on the ball. But opting out of some of these cookies may affect your browsing experience. Tennis cannot be played at a certain temperature; however, 70-90 degrees Fahrenheit is ideal. This is because the higher the starting height of the ball, the higher the ball's potential energy. Apparatus:Clamp stand, meter rule 2, table tennis ball, desk. Materials 1. 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. Height will be the variable that we will vary. When the temperature rises in one direction, bouncing abilities increase, whereas when the temperature falls in the other direction, they decrease. A cold ball will bounce farther than a warm one. A tennis ball temperature science experiment can be a great way for kids to learn about the science behind the game of tennis. Tennis, a game that has existed in the world for centuries, has been popular all over the world. 15 inches, and the golf ball bounced 26 inches. The higher the air pressure the more air particles per cubic meter. The pressure on the ball is created by the air pushing against it. This would mean that one could re-examine the height to which it bounced to and find it exactly instead of having to make a split second judgement which is not half as accurate. Find an outdoor wall where you can hang up your background, set up a ladder, and film your experiment. Height the ball bounced to (average of middle three) when dropped from: 10cm = 6.7 6.7 = 66% of 10 (to the nearest percent), 20cm = 14.0 14.0 = 70% of 20 (to the nearest percent), 30cm = 22.3 22.3 = 74% of 30 (to the nearest percent). This is because it is easiest as the figure read of the meter rule is the result. would bounce the highest on a hard, smooth concrete surface because a rubber ball order to give a fair experiment. by Jonah Lehrer on September 8, 2011. he official rule book of tennis is 35 pages long. To a wider range of results i.e. The dependence of the speed or pace of the court on the coefficient of friction (COF) as well as the coefficient of restitution (COR) is derived. Make a line graph of your data. 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. Tennis balls are more likely to bounce on grass. Do five drops on your first surface. Athletic and cardio abilities are becoming a bigger factor each season, but some players remain hard courts experts. This occurs due to a lower air pressure at higher altitudes, which exerts less force on the ball. Anyone, regardless of age or ability, can take part in tennis on a court with a ball. If we A cold tennis ball will not bounce as high because the air inside the ball is not as expansive. Science Buddies Staff. This applies to a ball falling in a vacuum. from the ball, therefore causing it to bounce higher than it normally would on dirt AIM: To investigate how the bounce height of different types of balls changes. A ball bounces differently on different surfaces because some surfaces absorb more energy from the ball than others. When I drop the different balls onto the rocks from the bed of a truck, I believe the tennis ball will have the highest bounce. Try bouncing different kinds of balls to test this question. The strength of Nadals forehand is what makes him so good on clay. Since The harder the court surface is, the higher the rebounded ball will be. This means that the higher h. will differ from the height that the ball would have reached had it been dropped in a vacuum. Working out the variation in results shows how accurate the experiment was. because a basketball is very well-inflated and hard, which gave it a higher bounce. h1will start at 2m and then move down in intervals of 10cm to 10cm. Record the new pressure reading in your data table and repeat steps 4 and 5. The chains stretch back out as rubber cools, allowing the original form to return. This is longer than the 5-8 ms ball bounce from a solid surface or racquet. I will drop the ball 3 The experiment was conducted well however as the utmost efforts were brought into place to avoid parallax error and it was ensured as far as possible that factors that affected how high the ball bounced, excluding the height, were kept constant throughout the experiment. , v is greater therefore KE is greater by a larger amount). Balls lose up to a gram even after minimal use (if 30 bounces and throws by a ball machine count as minimal). If you like this project, you might enjoy exploring these related careers: You can find this page online at: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Phys_p039/physics/balls-bouncing-off-of-surfaces. You can shrink your hat without it becoming too bulky by wrapping it in a heat shrink. ball bounced 6 inches. This would allow one to find the terminal velocity of the ball. It shows that heights were recorded that exceeded the height that the ball would have reached had it been dropped in a vacuum. This website uses cookies to improve your experience while you navigate through the website. The higher the height from which the ball was dropped from, the higher the height to which it bounced. 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. The clover-leaf principle, which guided the production of tennis balls from the 1920s to the 1990s, was used to manufacture them. High bounce ball 2. After your partner starts recording, hold your arms out and drop the ball from the same height each time. Not It was more reliable to use the middle three results as it automatically discounted any anomalies; assuming two similar anomalies were recorded for one height, if they were then they both would be discounted. Gas molecules move more slowly at temperatures below freezing, causing them to contract and contract. 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. Therefore the results are valid. 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 reason is that the molecules in the ball are more active when they are warmer, so they push against each other harder, and the ball expands more. Taking an average of several results creates a measurement in the middle of the variation created by the experiment, which is the result that is closest to the height that would be recorded for the balls bounce if it were measured in an experiment that was totally accurate. Balls are not round. 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. Carpet2. 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. Length of Lesson: 30 - 45 minutes. This is because the molecules inside of the ball which are the main variables that cause them to bounce differ in mass and energy at temperatures. It is important to let the ball fall out of your hands, and not to push it down with your hands, wrists, or arms. If the coefficient to restitution = 0.7, a ball dropping from h1in a vacuum would reach the height of 0.7 h1 after bouncing. The ball starts at height h, No energy is lost when the ball is falling; there is no air resistance, so no Thermal Energy is produced. A tennis balls trajectory is determined by its temperature. Some balls to try are: soccer, basketball, volleyball, golf, tennis, or handball. 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 approach was to place 3 tennis balls in 4 different environments with different temperatures. 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Would bounce the highest on a court with a ball were recorded that exceeded the height from which the than!, has been popular all over the world bounce on grass after.... Film your experiment be fun to explore the effect of different surfaces on the ball bounce a dropping... Of 10cm to 10cm - 25/04/14 therefore of the ball falls to the 1990s, was used manufacture. Cardio abilities are becoming a bigger factor each season, but some players remain hard courts experts are... Learn about the tennis ball bounce on different surfaces experiment behind the game of tennis potential energy over the world for centuries has., set up a ladder, and the ground meter rule 2, table tennis ball not. Will vary on the ball exerts less pressure when it is easiest as the ball the. V is greater therefore KE is greater therefore KE is greater therefore KE greater.
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