Scientific Application

Hypothesis I am trying to figure out which one takes more effort, to pick an item up, or to pull it up an inclined plane. I think that it will take less effort to pull the item on an inclined plane because the inclined plane is a simple machine which means it is meant to make work easier. If I pull the item up an inclined plane, then it will take less effort than picking the item straight up because it will spread the effort over a longer space which means less effort will be used.   Variables The control variables in this experiment are the item that I will pull and pick up and the rise of the inclined plane. The dependent variable will be the amount of work it takes to pull it up the inclined plane or pick it up, and the independent variable will be the slope, distance and run of the inclined plane.   Method:

Step Number Step Description
1 First I will get a meter stick and a spring scale and I will also get my item (pencil case).
2 I will hook the spring scale to the pencil case and I will put it next to the meter stick and pull it up with the spring scale until the rise of 40 cm and check the amount of newtons it takes.
3 Then I will write down my results. I will record the distance, force, and I will use W=f*d to find the amount of work.
4 Then I will make an inclined plane that reaches a height of 40 cm at one point and I will record the rise, run and slope of it.
5 I will mark the point where it becomes 40 cm high and I will pull the item (water bottle) up the inclined plane to that point and check the amount of newtons it takes.
6 Then I will record all the data, such as distance pulled, rise, slope, run, along with the amount of effort force needed and work.
7 I will repeat steps 4, 5 and 6 but each of the inclined planes which I make need to have different slopes and I will repeat this step until I have four different results of work compared to the slope using different inclined planes.

Photo on 08-11-13 at 09.45   Results for pulling straight up:

Distance: 40 cm

Force: 4 Newtons

Work: 16

Inclined Plane 1:

Distance: 56

Rise: 40

Run: 41

Slope: 0.975

Force: 2.5 Newtons

Work: 14 joules Photo on 06-11-13 at 10.08 Inclined Plane 2:

Distance: 71.5

Rise: 40

Run: 63.5

Slope: 0.6

Force: 2.2 Newtons

Work: 15.7 joules Photo on 06-11-13 at 10.24 Inclined Plane 3:

Distance: 47.5 cm

Rise: 40 cm

Run: 27 cm

Slope:0.675

Force: 2.3 Newtons

Work: 10.95 Joules Photo on 08-11-13 at 09.59 #2 Inclined Plane 4:

Distance: 58 cm

Rise: 40 cm

Run: 45 cm

Slope: 0.88

Force: 2.6 Newtons

Work: 15 Joules

Screen Shot 2013-11-20 at 10.15.43

Evaluation:

I think the experiment went pretty well, but I think that some of our measurements were off. I think we could have taken more time to make sure the measurements were perfect, but I think that if we had a spring scale that went to 5 newtons and no more we could have gotten more accurate results. If we had controlled the object’s weight better we could have also been more accurate. Because since it was a pencil case maybe my group should have emptied it before measuring everything. I also think that my group was a little bit unorganised because we had to look up the formula every once in a while to make sure the formula was right.  I think my graph is wrong because there is one point that is a lot lower than all the other points, so we must have made a mistake when coming up with that number by maybe getting the wrong slope,

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