Margarine Tub Essay

Investigate how the tidy sum give affect the outdistance travelled by a weighted margarin bathtub when it is propelled along a runway by a stretched rubber band training A Hypothesis I predict that as the mass of the oleo margarine tub increases, the distance travelled by the tub go out decrease. I think this because as the mass increases the surface friction provide withal increases this transfigure magnitude friction will cause the object to slow use up and stop faster and therefore in a shorter distance. The approach pattern for energizing energy is Kinetic energy = mass x velocity squargond.When both mass is propelled along a runway, it travels a certain distance. When the mass is heavier past travels a shorter distance, and when it is lighter it travels a longer distance because of the forces acting on it. It will as well travel a longer distance because of the increased momentum. I expect that the graphical recordical record will not be a straight line becaus e of the velocity squ ard part of the expression this will vary 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 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. Variables Controlled variables The controlled variables here are the length that the rubber band is stretched at, and the distance from the floor till the graduation of the runway. Independent variable The independent variable here is the mass of the margarine tub because I want to see how the mass affects the distance traveled. open variable The dependent variable here is the distance travelled by the margarine tub. Expected conductsMass (g) surmount travelled (cm) 15 readiness B Apparatus 1. One bendable band- to propel the object off. 2. A meter formula- to measure the distance travelled. 3. A margarine tub. 4. Sand- to vary the mass of the object. 5. A stool- to hold the tractile band. 6. Scales- to measure the mass of the margarine tub. 7. A measuring rod sheet- to measure how farthermost I rupture bottom the elastic band.8. A smooth surface- to carry out the experiment on. Method To check how mass affects the distance travelled by a roquette when propelled of an elastic band I am going to experiment with a margarine tub filled with guts. I will vary the amount of sand I put in the tub to create different plurality I will use masses 50g to 500g, experimenting every 50g. I resolute on this shake off because it will produce a large range of results which potty be easily analyzed and plot on a graph. I will stretch the elastic band around both of the legs of the stool this will hold the elastic band taught, so I can propel the tub off of it.I will hold the stool on a large sheet of paper with centimeter measurements on it running in the direction of the elastic band so I can measure, in centimetres ho w far I place back the tub on the elastic band. I will measure from the standstill of the tub to forge it more blameless. 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 warm centimetre because it is the most allot stop of accuracy, and I will measure across with another ruler to make the measurement readings more accurate. I am using a measurement sheet rather than a Newton metre to measure how far back I pull the elastic band, because the Newton metre tho went up to 10 Newtons and this force didnt pull back the elastic band far enough to propel the projectile a suitable 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 stretch the elastic band too untold 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 be occupy inelastically so it wint return to its original shape. Data Collection Mass (g) Distance traveled 1 (cm) Distance Travelled 2 (cm).Distance Travelled 3 (cm) Average (cm) The table above shows my results I measured to the nearest half(a) centimeter whilst I was collecting my results and worked out the average to the nearest millimetre. As you can see there is an unusual person, (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 r esult when I was doing my experiment. This graph does look similar to my evaluate graph that I explained, and this shows that my prediction was correct. I took out the anomaly from my table and then mensurable the average of 50g using the first 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 energizing 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 multiply ing the velocity by a constant, 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 successful 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 before taking each reading. If I did this experiment again, I would perhaps investigate more than one factor, and get a line 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 cover or greased surface. Also I would investigate more weights so that my line of best fit is more accurate on my graph, I m ight also extend the range of weights to see if this made each 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 Percentage 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 withal 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 dress circle of data.