Factors affecting the resistance of a wire Essay Example for Free

Factors affecting the resistance of a wire EssayTheory When an object is lift up, work is done. Once the object is in the raised position, it has gravitational dominance vital force. The heartiness it is has is the equivalent as the work done to get there. When the glob is lift to the height it forget be dropped from it exit, therefore, gain gravitational potential zip. This instrument that when my clustering is in the raised position it will lease gravitational potential energy. The equation for this is Potential energy = Mass x gravity x height When the ball is dropped this is converted into K. The equation for this is Kinetic Energy = 1/2 x mass x velocity2.However, the energy transfer is not perfect. Some of the energy will be wasted as non-useful energy, mainly heat and hygienic. This means that when the ball spring eras upwards again, it will not bring in as much energy as when it was dropped and will therefore not leap up to the same height. Because some of the energy is wasted as heat and sound. The amount of kinetic energy at the end is always less than the amount of potential energy you had to start with. This means that the ball will not flinch up as high, and therefore not have as much potential energy as it started with.Prediction In this investigation I will investigate the percentage energy loss when a ball bounces. The variables that could affect the amount of energy bewildered are The height the ball is dropped from. The type of ball used The size of the ball The temperature of the ball. The type of surface the ball is dropped on. The height the ball is dropped from will affect the energy lost because the higher the ball is dropped from the more than force it will it the surface with, and therefore the more power it will lose through with(predicate) sound, vibrations, and heat.The type of ball I use will effect my results, because some balls will have more elasticity than others, causing them to bounce higher. Also, ba lls 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 area would withal cause a change in force. The temperature of the ball will effect my results because if there is a higher temperature and then the molecules will affect 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 ensure a fair test I will choose one variable to change, and keep the others con stant throughout the investigation. in that respect 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 overly 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 merely 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 in addition a constant variable (unlike, type of ball or type of surface dropped on), which will help me when recording 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 differ ent heights, I will be able to see if there is a relationship between 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 calculate the ball will bounce up to the same height as it is dropped from.I think that the percentage of energy lost will remain nearly 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 proportional to the gravitational potential energy the ball has to start with. Method I will drop my balls from various heights up to a meter. (The high school I will use will be 40cm, 60cm, 80cm and 100cm) I will then record how high they bounce up on the next bounce. I will do each experiment 3 times and take an average to ensure I have accurate results. I will time all my experiments using a stopwatch.I learnt in my preliminary wo rk, 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 try 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 sorrowful 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 find the percentage of energy they have lost using the formula.