Conclusion and Discussion This section discusses patterns in the data and draws conclusions about whether your hypothesis is supported or refuted. A well written conclusion is extremely important and should include statements that are substantiated with data from the investigation.
Diagram of apparatus Boman, List as many variables involved as possible in your table above. The ball was raised to various heights; 1m, 1.
The ball was then dropped and the rebound was measured by eye at approximately 90 degrees to the ruler to minimise parallax errors. Experiment was repeated for a total of 3 trials per height and recorded in a table with averages calculated. The tennis ball was then dropped from various heights; 1, 1.
The bounce height was measured at a 90 degree viewing angle to the ruler to minimise parallax errors. The procedure was repeated another 2 times to take the average of the results in a table.
Results Show your data tables here. To see more about how to make a proper table, visit Skills - Tables and Graphs.
Be sure to insert a graph see how herebecause the eye picks up trends and patterns more easily from a diagram than it does from a table of numbers, plus trend lines can be drawn to extrapolate and interpolate data.
Connect the data points that are in succession i. Sample calculations To show ownership of your results and graphs, it's important to show a sample of the calculations that you have used in your experiment.
In this case I have used averages, as well as bounce efficiency calculations. Discussion State the relationship that you were expecting to find before you performed your experiment.
You should be able to find this in your introduction. It was expected that the bounce height will increase as drop height increases, but will not be quite as high as the original drop height and the resulting bounce efficiency will remain relatively consistent throughout the drop height range.
This was because as the ball was dropped from greater heights the gravitational potential energy increased simultaneously, which could then be converted back into kinetic energy as the ball bounced back.
Use them to answer your aim. What do your results show? This trend implies that shorter drop heights are more efficient than larger drop heights.
This could be due to the limits of the tennis ball to store kinetic energy as elastic potential energy because it requires increasingly greater amounts of force is to continue to squash the ball by the same amount when it lands. For example, it is easier to squash the ball a little, than it is to squash the ball to half its original height, due to an increase in air pressure inside the ball when squashed.
How reliable do you think your results were? How could you modify your procedure to make your results more reliable? Since the tennis ball reached its apex height on the rebound at a high speed, it was difficult to measure with adequate precision with sight alone.
Parallax errors were difficult to avoid as the bounce height was slightly different for each trial. To improve the reliability of the results for this experiment, one could use high speed video captures which could be slowed down to measure accurately against the ruler in the background. The original drop height also varied to a degree due to the nature of releasing the tennis ball by hand.
This drop height could be standardised by using a mechanical mechanism in which to drop the ball at consistent heights, such as rolling the ball down an elevated ramp onto the floor. What is one modification you would make to how you conducted the experiment, in light of your experience?
Future experiments should investigate the bounce efficiency over a greater number of drop heights to provide more data points to map out the trend. What are the implications of your findings for commercial wind mills? This could be done by calculating the bounce efficiency of the object at smaller heights, and extrapolated using the efficiency to find the estimated bounce height.
This could apply to space rover landings that use airbags to reduce impact upon planetary surfaces, where bounce height could affect the final landing location.
Conclusion The conclusion very briefly summarises the findings of the experiment and relates these back to the Hypothesis. The findings indicated subtle changes occur in the bounce efficiency of the tennis ball ranging from The results of the experiment support the hypothesis that as drop height increases, so too will the bounce height due to an increase in gravitational potential energy, however the bounce efficiency remained relatively consistent.This report on the starch test on leaves adequately describes the method and likely outcome of the test for green leaves grown in the light.
GCSE exam questions very rarely ask for this method but focus on investigations where the plant has been denied one factor required for photosynthesis. The Three-Step Process. It can quite difficult to isolate a testable hypothesis after all of the research and study.
The best way is to adopt a three-step hypothesis; this will help you to narrow things down, and is the most foolproof guide to how to write a hypothesis.
UNIT Electricity. Energy output of a solar panel Photovoltaics (PV) is a method of generating electrical power by converting solar radiation into direct current electricity using semiconductors that exhibit the photovoltaic effect.
Christopher Bollyn is a well-travelled writer and an investigative journalist who has done extensive research into the events of September 11, , the conflict in Middle-East and the health effects caused by exposure to depleted uranium. answers to a lab report are difficult to write because you have to write if your hypothesis is correct or not and prove it.
from is rezwan haque harvord academy. During the early years of junior high school you may be required to write a practical report for an experiment, or an extended experimental investigation (an experiment that takes you a .