We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

# Plumb Line Mechanics Experiment Essay Sample

• Pages: 2
• Word count: 491
• Rewriting Possibility: 99% (excellent)
• Category: experiment

Get Access

## Introduction of TOPIC

Making Assumptions and relating them to both the model and the experiment

To be able to use the mechanics theory that I know, the following assumptions must be made, listed in order of importance.

* All motion is vertical – Although the horizontal motion could be taken into account, it cannot really be measured with the equipment we have, and since it isn’t wanted anyway it is best just to redo trials that result in some horizontal motion. This requires two further assumptions:

o There is no spin – spin causes the movement of the ball in other directions.

o The floor is perfectly horizontal – As it not being so would cause the ball to bounce in other directions (although in practise this can’t be helped anyway)

* There is no air resistance – As I cannot calculate air resistance using the theory I currently know, and the acceleration would no longer be constant. Since the ball is small, spher

ical and heavy, it should encounter little air resistance and be only lightly affected by it.

Sorry, but full essay samples are available only for registered users

Choose a Membership Plan
style="text-align: justify;">* The ball is uniform and perfectly spherical – The ball could appear to have different values of e because of having different densities or small deformations at different points on the surface, although the chance of these remaining unnoticed is minimal.

* Acceleration due to gravity is constantly 9.8ms-2 – Gravity must be constant so that the constant acceleration formulae can be used. Fortunately the gravity will deviate very little from this value so this assumption makes little difference.

Conducting the experiment

The experiment is set up by attaching two metre rules to a wall using a plumb line to ensure that they are vertical. For the first part of the experiment a ball was dropped from a number of heights, and the height it bounced back up to was recorded. For the second part the ball was dropped from different heights and the time taken for it to bounce three times was measured.

Any measurements in which the ball bounced at an angle of more than 10 degrees were ignored, as were any in which the ball hit the wall or when the person dropping the ball felt that they had accidentally given it some spin. In both parts results were taken for every 10cm between 1 and 2 metres, and 5 results were taken for each height. The heights that the ball bounced to were recorded by the height that the top of the ball reached, as this was easier to measure than the height that the bottom of the ball reached, so the results have been adjusted by 4.38cm, the diameter of the ball.

We can write a custom essay on

Plumb Line Mechanics Experiment Essay Sample ...

Order an essay

## You May Also Find These Documents Helpful

Designing an Osmotic Potential Experiment with Potatoes

Osmosis is used throughout the kitchen in various countries. In France, aubergines and cucumbers are often soaked in salt to create a nicer texture, however chefs lack understanding of why this happens, as they would have forgotten about it after they finished school, they only know that it happens. Therefore, this experiment is designed to explain to the millions of chefs around the world why the water is “sucked” out of a vegetable when it is dipped into a salt or sugar solutions. I believe that having knowledge over the reason for something can open up new ways of thinking; this is why I think it is so important to explain the reason behind this phenomenon. Famous chefs are also known to be under time pressure; for example, every cooking show on TV includes some sort of time pressure scenario, weather it is a ticking clock or waiting customers. For...

Investigating the Effects of Salt on Seed...

PROBLEM/RESEARCH QUESTION In this investigation, we are researching and investigating whether the concentration/percentage of NaCl (salt) in water affects the germination rate of seeds and if so, which concentration germinates the most seeds. We will formulate our research by conducting an experiment in which we will observe the germination of seeds in various concentrations of salt water and evaluate the results gathered. In particular, we will measure the percentage of seeds germinated in one week and formulate our conclusions from there. HYPOTHESIS I hypothesise that the highest percentage of seeds will germinate in the petri dish that contains the lowest percentage of NaCl in water- 0.5% salt salinity and the percentage will decrease as the percentage of salt in the solution increases. I predict this because I know from prior knowledge that seeds need to be able to absorb H2O to germinate and salt prevents this. So if we increase...

Investigating the Effect of Sodium Fluoride on...

Graph Showing the effect different volumes of Sodium Fluoride has on the average rate of production of H+ ions as measured by the colour change of resazurine Comment on Graph: The graph depicts a positive trend, as the amount of Sodium Fluoride increases the average rate of H+ ions as measured by the colour change of resazurine also increases. This increase is consistent with each 5 mL increase of Sodium Fluoride resulting in an increase of one assigned numerical colour. This steady increase plateaus at 15mL with no further colour change. Conclusion and Evaluation Conclusion In our experiment we tested whether changing the amount of Sodium Fluoride effects the rate of respiration as measured by the colour change of resazurine. Our experiment indicates that there is a relationship between sodium fluoride and the rate of respiration. In our experiment the more sodium fluoride that was added the less colour change,...

## Popular Essays

Emma Taylor

online

Hi there!
Would you like to get such a paper?
How about getting a customized one?