Margarine Tub Essay

Investigate how the aggregative allow for affect the distance travelled by a weighted margarine tub when it is tripled on a runway by a perverted rubber ringing Planning A Hypothesis I predict that as the flowerpot of the margarine tub increases, the distance travelled by the tub leave decrease. I think this because as the mass increases the surface rubbing result besides increases this increase friction result cause the purpose to slow deplete and stop quicker and therefore in a shorter distance. The ruler for kinetic nix is Kinetic energy = mass x swiftness squ ard.When any mass is propelled along a runway, it travels a certain distance. When the mass is heavier then travels a shorter distance, and when it is lighter it travels a hourlong distance because of the forces acting on it. It volition also travel a longer distance because of the increased momentum. I expect that the graph provide not be a straight nervous strain because of the velocity squared part of the formula this will pull up stakes the gradient of the line of best fit. The gradient will change because you are not multiplying the velocity by a constant, but by itself so the large the velocity, the more than the number will increase by when squared.This is why the gradient is steeper at the get down of the graph. Variables Controlled variables The controlled variables here are the length that the rubber lap is stretched at, and the distance from the floor till the beginning of the runway. main(a) variable The independent variable here is the mass of the margarine tub because I want to reveal how the mass affects the distance traveled. Dependent variable The dependent variable here is the distance travelled by the margarine tub. Expected resultsMass (g) placego travelled (cm) 15 Planning B Apparatus 1. maven elastic band- to propel the object off. 2. A meter ruler- to stones throw the distance travelled. 3. A margarine tub. 4. Sand- to vary the mass of the object. 5. A stool- to hold the elastic band. 6. Scales- to amount of money the mass of the margarine tub. 7. A rhythmment sheet- to measure how cold I pull back the elastic band.8. A smooth surface- to carry out the experiment on. Method To investigate how mass affects the distance travelled by a projectile when propelled of an elastic band I am going to experiment with a margarine tub filled with sand. I will vary the amount of sand I put in the tub to create different populace I will use masses 50g to 500g, experimenting every 50g. I decided on this range because it will produce a large range of results which can be easily analyzed and plotted on a graph. I will stretch the elastic band around two of the legs of the stool this will hold the elastic band taught, so I can propel the tub off of it.I will stand the stool on a large sheet of paper with curium measurements on it running in the direction of the elastic band so I can measure, in centimetres how farthest I pull back the tub on the elastic band. I will measure from the outdoor stage of the tub to make it more undefiled. I will position the 0 end of the ruler at where I pull back the tub and elastic band on the measurement sheet, this way I will be measuring the complete distance travelled by the projectile. I will measure from the same end of the tub when I pull back the elastic band and when I measure how far it has travelled.I will measure to the nearest centimetre because it is the most appropriate degree of accuracy, and I will measure across with another ruler to make the measurement readings more undefiled. I am using a measurement sheet rather than a nitrogen metre to measure how far back I pull the elastic band, because the Newton metre only went up to 10 Newtons and this force didnt pull back the elastic band far enough to propel the projectile a sui evade distance to measure. This would make it hard for me to collect an appropriate range of accurate results.I need to make sure I dont stre tch the elastic band too much that I reach the elastic limit of the elastic band. If I do stretch the band beyond its elastic limit, as stated in Hookes Law, the elastic band will behave inelastically so it wont return to its original shape. Data Collection Mass (g) Distance Travelled 1 (cm) Distance Travelled 2 (cm).Distance Travelled 3 (cm) Average (cm) The table above shows my results I measured to the nearest half centimeter whilst I was collecting my results and worked out the bonny to the nearest millimetre. As you can see there is an anomaly, (81 cm for 50 grams) you can tell this is an anomaly because it is almost double of the other two experiments. This anomaly will make a difference to the average, so I will not include it in my final graph. Data ProcessingThis graph shows my results and the anomaly, I plotted the points using the averages. The point at 50g is higher than it should be, so there must have been a factor which affected this result when I was doing my exper iment. This graph does look similar to my expected graph that I explained, and this shows that my prediction was lay out. I took out the anomaly from my table and then calculated the average of 50g using the number one two results of the 50g experiment. I then plotted another graph, but this time without the anomalyThe trend in the graph shows that as the mass of the margarine tub increases, the distance travelled by the tub decreases. This is correct because as the mass increases the surface friction also increases this increased friction causes the object to slow down and stop quicker and therefore in a shorter distance. Conclusion and Evaluation The formula for kinetic energy is Kinetic energy = mass x velocity squared. As the kinetic energy is a constant, the line of best fit is not a straight line because of the velocity squared part of the formula this will vary the gradient of the line of best fit.The gradient changes because you are not multiplying the velocity by a consta nt, but by itself so the larger the velocity, the more the number will increase by when squared. This is why the gradient is steeper at the start of the graph. The basic trend of the graph shows that the distance decreases, at a decreasing rate, as the mass increases. This is what I predicted would happen, and it was correct. I am pleased with my results and feel that they are as accurate as I could make them.I measured the distances to the nearest half centimetre because this was an appropriate degree of accuracy and made sure the ruler was in the correct position sooner taking each reading. If I did this experiment again, I would perhaps investigate more than one factor, and beget out the effect they have on each other. For example I could investigate how far an object travels when propelled of an elastic band along an oiled or greased surface. Also I would investigate more weights so that my line of best fit is more accurate on my graph, I might also extend the range of weights to see if this made any difference.My percentage error was 14%, I worked this out using my expected table of values and my actual table of values, I used the formula constituent error = (value expected value / expected value) x 100. I had one anomaly whilst collecting my results, so there must have been a factor which affected this result when I was doing my experiment. This was probably a human error of misreading the length on the ruler however it could have been any of the factors explained on the first page. Finally, I am pleased with my results and overall experiment and I feel I produced an accurate set of data.