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

The aim of this experiment is to prove that a falling body has a constant force of gravity on it, no matter what the distance or time taken for the object to fall. The value of gravity or "g" will be determined.

Extracts from this document...

Introduction

AIM

The aim of this experiment is to prove that a falling body has a constant force of gravity on it, no matter what the distance or time taken for the object to fall. The value of gravity or "g" will be determined.

THEORY

The most simple example of linear motion is a body falling to Earth. When the body is dropped from a height we know that the object will always fall directly towards the centre of the Earth. This though will not happen if a feather is dropped as due to its shape and the forces of drag, upthrust and various others act upon it with greater effect. So providing these forces in our experiments and calculations are negligible by using suitable materials it is fair to say an object falls towards the Earths centre.

image00.png

When the plastercine passes through gate A the computer will immediately start the clock.

...read more.

Middle

 
The range of results will be from 0.3m to 0.6m. This is because at a smaller distance the computer is unable to register the speeds fast enough, and at a greater distance the light gates do not connect with the computer. By taking 5cm intervals enough results can be taken to plot a graph. 
In order for my results to be reliable I shall take three readings for each distance. An average can the be taken and error reduced as anomolous results would be illiminated. 
As the computer only displays the velocities the most suitable equation of motion to determine "g" would be V² = u² + 2as or V² = u² + 2gs. This equation can be re-aranged to prove "g" is constant by making gravity the subject.

V² = u² + 2gs

V² - u² = 2gs

V² - u² = g

2s

<ALIGN=LEFTV = final velocity 
u = initial velocity 
s = distance between gates

CONCLUSION

Using the equation would need an average gravity of each reading.

...read more.

Conclusion


Using the line of best fit it can be seen that there is an anomolous result when 2s is equal to 1.0m, which is a distance to fall of 0.5m. This meant that the line of best fit has to be brought down to a lower gradient. So the true gradient should be a little steaper. This would increase the acceleration due to gravity. This could be proved by retaking the readings at this point and calculating a new average.

To further this investigation and prove totally that gravity is a constant force a second experiment could be carried out. Of the several available to measure g, it would be possible to select one which does not rely on linear motion but simple harmonic motion instead. By setting up a simple pendulum it is possible to calculate a value of g by measuring the average time for a single pendulum oscillation. If the length of the pendulum is known, it is possible to plot graphs and get a value for g.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Mechanics & Radioactivity 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 AS and A Level Mechanics & Radioactivity essays

  1. Determination of the acceleration due to gravity (g) by free fall.

    then lightly tighten the thumbscrew to lock the release plate in place. Release the ball by unscrewing the thumbscrew. 4. The height h is measured from the bottom of the ball (held in the Release mechanism) to the top surface of the target pad when the pad is pressed against the metal base of the Receptor Plate.

  2. Experiment to find the acceleration due to gravity using free fall.

    We see that the graph is almost a straight line showing that my initial prediction was correct in that the time squared had a positive correlation with the distance travelled. Let us presume now that we do not know that g is 9.8m/s/s and work it out based upon data on the graph.

  1. Objectives: To determine the center of gravity of a body of irregular shapes

    The definition of the center of mass is the point that all the individual masses seem to be concentrated at. There are two methods of finding out the center of gravity, one is by the mathematical method and another is by drawing lines on the A4 sheets.

  2. To determine the acceleration of gravity in a free fall experiment.

    Instantaneously the line of best fit can reveal results that are inaccurate. A graph is easier to understand and make sense of results. I think my result is good, however the fact that my result is above 9.81 ms(� means the ball was travelling faster than the usual acceleration of gravity, which is quite strange.

  1. Experiment to Find Acceleration due to Gravity

    in free-fall and then measure its time and displacement through the following derived equation S = ut + 1/2 at^2, Initial velocity is zero so, S = 0 + 1/2 gt^2 Therefore g = 2S / t^2. Though for this to be accurate the only force acting on the object must be gravity and the air resistance must be negligible.

  2. Physic lab report - study the simple harmonic motion (SHM) of a simple pendulum ...

    -6.11E-03 2.14E-01 -1.83E+00 <BR />1.10E+01 6.67E-01 1.57E-01 -6.11E-03 1.83E-01 -4.59E-01 <BR />1.20E+01 7.33E-01 1.57E-01 -8.15E-03 0.00E+00 -2.75E+00 <BR />1.30E+01 8.00E-01 1.63E-01 -1.02E-02 9.17E-02 1.38E+00 <BR />1.40E+01 8.67E-01 1.57E-01 -1.02E-02 -9.17E-02 -2.75E+00 <BR />1.50E+01 9.33E-01 1.53E-01 -1.02E-02 -6.11E-02 4.59E-01 <BR />1.60E+01 1.00E+00 1.39E-01 -1.02E-02 -2.14E-01 -2.29E+00 <BR />1.70E+01 1.07E+00 1.22E-01 -8.15E-03

  1. Use of technology in a hospital radiology department. The department of imaging is one ...

    This usually takes no more then 5- 10 minutes. However there are risks involved with X-ray, but a plain x -ray uses such a small amount of radiation, equivalent to that which we all receive from the atmosphere over a period of 2 or 3 days, Which the risk is very small.

  2. Multi-bladed Pumps. Does the number of propellor blades affect the efficiency of a ...

    The water experiences a narrower range of forces with six blades than it would with two or three blades. Time Force B C A More modifications Problem Solution The vibrations from the drill rotation cause the whole apparatus to slide along the work surface.

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