Science



☒ Not achieved ☑Achieved☑☑Advanced
 * Science Fair Marking Term 2 2011**

☑☑Clear aim/hypothesis carried through ☑☑Method, accurate experimentation ☑☑Accurate experimentation, controls, variables, repetitions ☑☑Results clear, accurate, include appropriate data ☑☑Conclusions are in line with aim/hypothesis ☑☑Results are interpreted and discussed (conclusion)
 * Scientific Process and Background:**

☑Design of the experiment ☑Use of apparatus and materials
 * Technical Skill:**

☑Imaginative/creative ideas ☑New/Unusual application in science
 * Originality:**

☑Colour/form/clarity/graphics ☑Innovative appeal
 * Presentation of Display:**

☑Authentic ongoing record with raw data included ☑Has supporting documentation, bibliography, acknowledgements
 * Log Book:**

Laura I would like to take the opportunity while marking your Science Fair to congratulate you on your consistent effort and hard work. You truly are a quite achiever. Watching you work or helping someone if asked is such a pleasure, I am thankful that you are in Room 41.
 * Teacher Comment:**

You have a well structured Science Fair and have followed the guidelines carefully. It was good to see that you did the experiment more than once and used averages. You also clearly did research that backed up your findings and included this in your conclusion. Well done Laura you should be proud of your effort.

I think my science fair was average. It was better than last years because I wrote more in the conclusion. It was easy and simple but the math equations got a bit confusing at times.
 * Student Comment:**

==I already know that when you drop a ball it never goes as high as what you dropped it. == ==I chose this topic because I have noticed that the ball thats dropped doesn’t go to the height where it was dropped. I was interested in see where the energy goes and why. ==

==In this investigation, I want to find out how much energy is lost when a ball is dropped at different heights on a wooden floor. I also what to know if there is a relationship between kinetic and potential energy. ==

==In this experiment I predict the ball will lose it's most energy at a higher height because there is a longer distance to go, so there is more time to lose energy to air resistance. I think the height that the ball will bounce the highest to the starting point will be 50cm because it is closer to the ground and doesn’t have that far to go. ==

1. Find a wall next to the chosen surface.
==2. Using a measuring tape, measure 2.5 meter up the wall and mark on the wall a 5 centimeter scale. == ==3. Set up a video camera on a tripod so it is positioned in front of the scale, so the numbers can clearly be seen. ==

8. Repeat these steps 3 times and find the average of the results.
==9. Repeat the above at the different heights ( 1 meter, 1.5 meters, 2 meters, 2.5 meters. ==

==//Excellent start to your Science Fair Laura, I am interested in seeing your results. Please begin your experiment as soon as possible.// ==

 (joules) == == ||  Energy loss  == ==  (joules) == == ||  Percentage energy loss  == == ||
 *  Drop Height (m) == == ||  Test 1 Rebound Height (m)  == == || <span style="display: block; font: normal normal normal 9px/normal Helvetica; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: center;"> Test 2 Rebound Height (m)  == == || <span style="display: block; font: normal normal normal 9px/normal Helvetica; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: center;"> Test 3 Rebound Height (m)  == == || <span style="display: block; font: normal normal normal 9px/normal Helvetica; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: center;"> Average Rebound height (m)  == == || <span style="display: block; font: normal normal normal 9px/normal Helvetica; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: center;"> Potential Energy  == == || <span style="display: block; font: normal normal normal 9px/normal Helvetica; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: center;"> Kinetic Energy  == ==
 * ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.5 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.39 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.40 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.40 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.39.6 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.24525 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.194238 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.051012 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">20.8% == ||
 * ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.0 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.77 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.78 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.78 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.77.8 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.4905 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.381609 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.108891 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">22.2% == ||
 * ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.5 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.06 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.08 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.09 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.07.6 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.73575 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.527778 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.207972 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">28.26% == ||
 * ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">2.0 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.39 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.41 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.42 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">1.406 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.981 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.689643 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">0.291357 == || ==<span style="font-size: 130%; font: normal normal normal 9px/normal Helvetica; letter-spacing: 0px; margin: 0px;">29.7% == ||

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">I worked out the percentage of energy loss by using M.G.H (mass, gravity and height). First I multiplied the mass which is 0.05kg by gravity (9.81) times the height of what the ball started at. That answer is how much potential energy is in the ball at the start. Then do the same for the height the ball bounced to, but instead of what the ball started at from where it bounced to, to find the Kinetic energy. Afterwards I found the difference between the numbers and divided the starting number by the difference by 100 to get the percentage of energy loss. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">The graph shows that the higher the ball falls from, the more the energy percentage is lost.When the ball is dropped from a taller height it has more potential energy, so while the ball is falling it turns into kinetic energy, therefore there will be more kinetic energy available to be converted into sound and heat so more percentage of energy will be lost. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">My hypothesis was correct. I predicted that when the ball was dropped at a higher height it lost more energy. At 2.0 meters it lost 29.7% but when dropped at 0.5 meters it only lost 20.9% of it’s energy. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">From this experiment, I have learnt about potential and kinetic energy. Potential energy (PE) is when the object is still and at a certain height. When the object starts to fall it has kinetic energy (KE) which means it is moving. Just before an object has hit the ground it has 100% KE. Also I have learnt that energy doesn’t disappear. It transforms to heat and sound. This relates to the law of conservation of energy which states that “Energy cannot be destroyed nor created, it can only be transformed”. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">My results for all of the test were, for the first test (0.5 meters) 0.39m, 0.40m, 0.40 the average was 0.39.6 the energy percent lost was 20.8%. The second test (1.5m) was 0.77m, 0.78m, 0.78m and the average 77.8 the percentage was 22.2%. The third test (2.0m) was 1.06m, 1.08m, 1.09m and the average 1.076 and the percentage 28.26%. The fourth test (2.5m) was 1.39m, 1.41m, 1.42m and the average 1.406m and the percentage 29.7%. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">A ball being dropped is like a roller coaster cart dropping. When the cart is powered by an electric motor to the top of the drop it is the same as someone lifting a ball in the air. When it gets to the top is has 100% Potential energy (PE). When the cart has fallen it will lose a percentage of its energy and although it will start to climb the next ramp it will never get to the same height unless powered by a motor. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">In the diagram above it shows that it starts off with a lot of PE because of it height. As it falls it will lose some of its energy due to air resistance, heat, sound and friction. Then it will climb to the second height but this is at a smaller height because of the energy losses. Each time it climbs it looses at bit of its energy. In the end it will lose all of its energy and stop all together. ==

==<span style="font-size: 130%; font: normal normal normal 12px/normal 'Al Bayan'; letter-spacing: 0px; margin: 0px;">If I were to do this experiment again I would do it on different surfaces or even using different balls. For the next stage in this experiment I would investigate the energy losses and changes in a roller coaster system. ==

Science board layout