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

AIM: To determine the acceleration due to gravity on Earth using the drop ball technique.

Extracts from this document...

Introduction

Candidate Name: Session: May 2015 Page | International Baccalaureate Diploma Program (IBDP) Session: May 2015 Physics HL Lab Report Lab Report Title: Determining acceleration due to gravity. Criteria Assessed: * Data Collection and Processing (DCP) * Conclusion and Evaluation (CE) Candidate Name: Candidate Number: International School, Singapore AIM: To determine the acceleration due to gravity on Earth using the ?drop ball? technique. INTRODUCTION: Gravity is one of the four fundamental forces and on Earth, it pulls everything towards the center of the Earth. According to Newton?s second law, since gravity is a force, it will cause any mass to accelerate. The objective of this experiment is to find the acceleration of any mass due to gravity on Earth. Since the Earth has an atmosphere, free fall of a mass is technically not possible due to the constant upward drag caused by wind. However, when the mass itself is many times denser than air, the effect of air resistance on its movement can be neglected. Hence, to find the acceleration due to gravity (g) in this experiment; all the students were given metal bob pendulum. Since a metal bob?s density is many times higher than air and its spherical shape is aerodynamic, the effect of air resistance on its downward descent could be ignored. ...read more.

Middle

0.2610 0.2604 5 41.0 0.2910 0.2906 0.2912 0.2900 Table 1: Raw Data: Time taken for metal bob to drop from each height Uncertainties: * Uncertainty in the Height (H) = = ±0.1cm. * Uncertainty in the Time taken = Uncertainty in instrument = ±0.0001s. Using a spreadsheet, the average time taken was calculated and are displayed in the table below: Serial No. Height / H (cm) ±0.1cm Time Taken (s) Average 1 9.0 0.1352 ± 0.0002 2 17.0 0.1861 ± 0.0005 3 25.0 0.2260 ± 0.0001 4 33.0 0.2604 ± 0.0007 5 41.0 0.2907 ± 0.0006 Table 2: Processed Data: Average time taken for metal bob to drop from each height. Uncertainties: * Uncertainty in Time TakenAverage = Random error = Sample calculation for 1st set of data (H = 9.0cm): ±0.0002s. Note: The higher of the random error and the instrumental error is taken. In case of the 3rd set of data, random error = instrumental error. Thus, uncertainty can be any. To find the value of g, the value of t2 is calculated using a spreadsheet and is displayed in the table below: Serial No. Height / H (cm) ...read more.

Conclusion

The uncertainty, however small cannot be ignored and it must be explored so that if possible, it can be avoided in the future. Firstly, the recording of the height was not done with a very precise ruler. A lot of time and effort was spent to ensure its accuracy in the readings and not let its faults hinder the experimental results. This is could be avoided if a more precise ruler or instrument to measure height could be present. Secondly, although the voltage spike generator (CRO) was undeniably accurate, no information about any time delays in the microphone was known. The possibility of microphone causing a significant lag, in spite of the ball falling close to it is very improbable but nonetheless, it exists. The effects of air resistance were ignored because of their very ignorable influence on the readings. The mild influence on the readings in this experiment might partially be owed to the effect of air resistance. Perhaps, a more aerodynamic object could be used but investing in those are not worth unless the major sources of systematic error such as the imprecise ruler and the doubtful microphone are replaced with reliable, accurate and precise instrument. Ultimately, this experiment serves to remind us of the experimental nature of Physics and in the course of this experiment, many doubts were cleared with regard to instruments and techniques. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Physics 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 International Baccalaureate Physics essays

  1. How does the mass of the paper helicopter affect the drop time of the ...

    force increases to a large enough value to balance the downward force of gravity. Thus the objects (in this case paper helicopter) with a greater mass will continue to accelerate for a longer period of time then a paper helicopter with a lower mass which thus results in a decrease in drop time.

  2. Determining acceleration of free fall by of a simple pendulum.

    My largest problem was the small scatter of data on the graph and the data being skewed to one side of the graph due to a systematic error. This may have been caused by my reaction time in starting and stopping the stop watch, another reason for this could be

  1. In this extended essay, I will be investigating projectile motion via studying the movement ...

    horizontal motion of the dart- vertical motion is independent of horizontal motion. In this extended essay, a spring connected to a container and a metal ball will be used to investigate projectile motion. The research question is "How does the projection height and the compressed spring length affect the horizontal projection range of the metal ball?"

  2. Investigate the Size of Craters in Sand Due to Dropped Object.

    and it is also followed by kinetic energy. The kinetic energy will increase (KE) as potential energy increase. Assuming the energy throughout the dropped is conserved which indicates that PE is equal to KE and no energy loses to the surroundings. The velocity of the slotted mass dropped at each height and it impulse can be obtained.

  1. Energy density experiment - Aim: To determine the energy density of ethanol

    Trial temperature of water (oC � 1oC) 0.5 1 8 2 11 3 10 1.0 1 20 2 17 3 20 1.5 1 29 2 31 3 31 2.0 1 39 2 34 3 39 2.5 1 54 2 53 3 53 Sample Calculation 3.

  2. Bifilar Suspension - the technique will be applied to find the mass moment ...

    it should not move in other directions. * The reaction time should be on par with the oscillations. * The measure should be selected i.e. distance from the string should be selected only after experimentation of all the possible values.

  1. HL Physics Revision Notes

    Fission: A nuclear reaction where large nuclei are induced to break up into smaller nuclei and release energy in the process. Used in nuclear reactors and atomic bombs One such reaction is bombarding a uranium nucleus with a neutron causing it to break up into two smaller nuclei.

  2. Investigation into the relationship between acceleration and the angle of free fall downhill

    As a result, the uncertainty in the length and height of the plane is ±0.0005m. It is to be noted that the time recorded used up to three decimal places, due to the use of a Casio stopwatch which differs from the usual stopwatch that would be used that would only have 2 decimal places.

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