• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

"Does the pulling force increase as the weight of the box increases and, if so, is the pulling force directly proportional to the weight of the box"

Extracts from this document...


DRAGGING THE BOX INVESTIGATION "Does the pulling force increase as the weight of the box increases and, if so, is the pulling force directly proportional to the weight of the box" The design Prediction based on Scientific Knowledge When I apply the brakes on my bicycle a larger force from my hand produced a larger force on the brake blocks. This produces a larger frictional force on the wheel and I decelerate more quickly. The weight of the box is the force pushing down and so I predict that a larger weight will produce a larger frictional force. When pulling the block at constant speed the pulling force equals the force of friction and so I predict that a larger weight of box will produce a larger friction and need a larger pulling force. Proportionality means that if the weight of the box is doubled, the pulling force needed is doubles. I do not have any knowledge that would enable me to predict this. ...read more.


Diagram of the apparatus See separate sheet. The basic idea of the method Start with a weight on the wooden block and then start to pull the spring balance so it will then start to slip or you could just give it a gentle push to release it and then you take the reading straight away. The range of values for the weight of the box and how I decided on this range I did a preliminary experiment, I put 30N on the wooden block but I couldn't measure the pulling force with a 10N metre so I decided the range will go from 5N to 25N, going up in 5N Newton each time. The measurements to be taken 0N 0.7 0.6 0.7 0.6 0.7 0.7 5N 2.2 2.2 2.5 2.5 2.0 2.2 10N 3.3 3.5 3.6 3.6 3.7 3.6 15N 5.1 5.0 5.3 5.2 5.4 5.2 20N 6.8 6.8 6.8 6.9 6.7 6.8 25N 8.4 8.6 8.4 8.5 8.4 8.3 Observations Results table and calculation of averages (table from excel or a hand drawn one) ...read more.


The conclusions do agree with my original predictions because the graph I predicted is a straight line, the graph is a straight line therefore it suppors my predictions. Evaluation In carrying out the experiment I found it difficult to get the reading because it kept on wobbling. I found that the boards weren't long enough. If you pulled it along you don't have much time to take the reading. I tried to overcome this by taking a lot of repeat readings and the taking an average. I could improve my procedure by redesigning the apparatus. Comments about the reliability of the evidence The results on the graph are closely grouped along a straight line and there is no other line that can be drawn. I think that my evidence is reliable and that my results support the conclusion I have made. The results on the graph so a wide variation. Although a straight line can be drawn which passes through the origin can be drawn, there are others which can be drawn which do not. I think it is likely that the line passes through the origin but it is not absolutely certain. Homan Wan ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Forces and Motion essays

  1. How does the weight of an object affect the friction it has on the ...

    I could also have made a mathematical error, or a measurement error. However the apparatus is the most responsible factor in the experimental error, as the apparatus available was not precise. For example the weights were not precise, and the smallest weight was 5g, and the surfaces were damaged.

  2. Investigate how the weight of an object affects the force required to overcome friction.

    and the total mass will then be converted into the total weight and noted. o Steps 3, 4 and 5 will then be repeated several times until all of the weights have been used, making sure only one is added at a time for each separate set of results.

  1. In this experiment I aim to find out how the force and mass affect ...

    to find out how long it will take the trolley to reach the finish line and actually produce a theoretical result prior to conducting the experiment. Obviously, this won�t be necessary for a simple prediction, but it shows that the higher the ramp is raised, the higher the velocity of

  2. "Oh My Elbow - Investigation Into Force Applied To Elbow Joint".

    Friction - Friction will play a major part in my investigation as it involves moving parts. There will be friction on both nails and also in the spring balance. As I found when conducting my preliminary investigation, the ruler sticks on the nail and so this means that a certain

  1. Investigate the relationship between pulling back an elastic band and how much force it ...

    This would make the tub travel less. However, it is out of the scope of this report to investigate the exact frictional force applied by the table. Method: I am going to put a stool on a desk and attach an elastic band to two legs of the stool.

  2. Prove that "Frictional Forces are Surface dependant".

    to overcome friction is proportional to the total perpendicular force pressing one surface against the other. E.g.: when the weight of a box being pulled across the floor is doubled, the force pulling the box must be doubled. The ratio between the weight being pulled/pushed, and the force required is called the coefficient of friction.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work