Factors affecting the resistance of a wire Essay Example for Free

Factors affecting the resistance of a wire EssayTheory When an object is lifted up, pee is done. Once the object is in the raised position, it has gravitational capableness readiness. The cipher it is has is the same as the reverse done to get there. When the lummox is lifted to the height it leave behind be terminateped from it lead, then, gain gravitational potential energy. This means that when my goon is in the raised position it volition move over gravitational potential energy. The comp be for this is Potential energy = Mass x gravity x height When the ball is shakeped this is converted into K. The compare for this is Kinetic Energy = 1/2 x mass x velocity2.However, the energy transfer is non perfect. Some of the energy forget be wasted as non-useful energy, mainly heat and sound. This means that when the ball bounces upwards again, it pass on not assume as much energy as when it was dropped and leave alone therefore not bounce up to the same height. B ecause near of the energy is wasted as heat and sound. The tot of kinetic energy at the end is always less than the amount of potential energy you had to assume with. This means that the ball exit not bounce up as high, and therefore not have as much potential energy as it started with.Prediction In this investigation I testament investigate the percentage energy loss when a ball bounces. The variables that could affect the amount of energy mixed-up are The height the ball is dropped from. The fiber of ball used The size of the ball The temperature of the ball. The type of get along the ball is dropped on. The height the ball is dropped from will affect the energy lost because the high the ball is dropped from the to a greater extent push it will it the surface with, and therefore the more power it will lose through sound, vibrations, and heat.The type of ball I use will effect my results, because some balls will have more centering than some others, causing them to bou nce higher. Also, balls will have different levels of pressure inside them. The higher pressure is the higher the speed of the molecules. When the molecules go at a higher speed they will have more kinetic energy, so the molecules will hit the walls with a greater frequency and force, and so the pressure on the walls will increase. This will make the ball bounce higher because it will hold more energy.The size of the balls will effect my results because Force=Pressure x Area so a change in region would also cause a change in force. The temperature of the ball will effect my results because if there is a higher temperature then the molecules will move at a greater speed and the ball will have more energy causing it to bounce higher. The surface I drop my ball onto will effect the amount of energy lost because some surfaces, like softer surface, will absorb more energy and cause the ball not to bounce up as high. To procure a fair footrace I will choose one variable to change, and keep the others constant throughout the investigation.There are other variables that could effect the outcome of my investigation, for example gravity. However, gravity is always constant on the earth, and is a force of about 9. 8 m/s2. This would be too hard for me to change in a classroom situation. I will also not exert any force on the ball other than those already acting on it, because it would be to hard to keep the force constant, and would mean the test was not fair. For this investigation I will only change the height the ball is dropped from. I have chosen to use the height because, although all the variables are hard to accurately measure, height is easier than the others.Height is also a constant variable (unlike, type of ball or type of surface dropped on), which will dish out me when enter my results. Using a variable that I can measure fairly accurately will help ensure a fair test. By investigating the percentage of energy lost when I drop the balls from different heights, I will be able to see if there is a relationship mingled with bounce height and drop height. This is also the relationship between potential energy and kinetic energy. Because some of the energy will be transferred into non-useful energy, mainly heat and sound, I do no think the ball will bounce up to the same height as it is dropped from.I think that the percentage of energy lost will remain approximately the same no matter what height I drop the ball from. This is because the amount of energy lost to non-useful energy such as heat and sound is comparative to the gravitational potential energy the ball has to start with. Method I will drop my balls from diverse heights up to a meter. (The Heights I will use will be 40cm, 60cm, 80cm and 100cm) I will then embark how high they bounce up on the next bounce. I will do each experiment 3 times and turn over an average to ensure I have accurate results. I will time all my experiments using a stopwatch.I learnt in my front work, that if I drop a ball from lower than 40cm it is very hard to measure the bounce height. This is why I have left out the bottom height which would have been 20cm. I will undertake and drop the balls straight downwards because this will make it easier when I measure the height they bounce up to, as I wont have to move the ruler too much. This will also ensure a fair test, as my results will be more accurate if I am not moving the meter rule, as moving it could mean it is not entirely straight and would cause me to take an inaccurate measurement.I will not exert any force on the balls as I drop then, because it would be virtually impossible to keep the force constant, and would therefore make my results unreliable. I will calculate how much energy my balls have using the equation PE = mgh, this will be PE1. I will then drop my ball and record the height it bounces up to. I will then record its potential energy, again using the formula PE = mgh, this will be PE2. I will then be wilder the percentage of energy they have lost using the formula.