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

Investigation on ‘The Law of Conservation of Energy’

Extracts from this document...

Introduction

Investigation on 'The Law of Conservation of Energy' Background Information The Law of Conservation of Energy states that energy can neither be created nor destroyed: it is always changed from one form to another. If an object is raised above the ground it acquires Gravitational Potential Energy (GPE). The amount of GPE depends upon the mass (m), the force of gravity (g) and the vertical height the object is lifted (h), where: GPE (in joules) = mass (in kilograms) x force of gravity (10N/kg) x height (in metres) or GPE = mph If an object is allowed to fall under the influence of gravity, it acquires Kinetic Energy (KE). The amount of KE depends upon the mass (m) and the velocity (v) where: KE (in joules) = 1/2 mass (in kilograms) x velocity2 (in metres per second) or KE = 1/2mv2 Plan I have to use a dynamics trolley in order to investigate and prove the Law of Conservation of Energy. To do this I will set up a ramp and a let the dynamics trolley roll down it, measuring the energy at the start, and at the end of its movement. The Law of Conservation of Energy states that energy is not lost when we do something, it is merely changed from one form to another. ...read more.

Middle

I can then use this (and the mass) to find the KE of the trolley. Results Note: All units have been converted so that they fit the original equation. (e.g. centimetres to meters) Height of ramp (h) 10cm 20cm 30cm GPE at start (in J) 0.540 x 10 x 0.1 = 0.54 0.540 x 10 x 0.2 = 1.08 0.540 x 10 x 0.3 = 1.62 Distance between dots (d) 2.5cm 3.5cm 4.5cm Velocity of trolley (in m/s) 0.025 / 0.02 = 1.25 0.035 / 0.02 = 1.75 0.045 / 0.02 = 2.25 KE at end (in J to 2d.p) 0.540 / 2 x 1.252 = 0.42 0.540 / 2 x 1.752 = 0.83 0.540 / 2 x 2.252 = 1.37 40cm 50cm 0.540 x 10 x 0.4 = 2.16 0.540 x 10 x 0.5 = 2.7 5.5cm 6.5cm 0.055 / 0.02 = 2.75 0.065 / 0.02 = 3.25 0.540 / 2 x 2.752 = 2.04 0.540 / 2 x 3.252 = 2.85 Analysing Here is a graph to show the relationship between the height of the ramp and the trolley velocity. This graph shows us that as the height of the ramp increases then so does the velocity of the trolley at the end of the ramp. ...read more.

Conclusion

The only explanation I can come to for this result is that there was a gust of wind which pushed the trolley, or that when I was releasing it I accidentally pushed it slightly. There are factors that you could change in order to obtain a more accurate result these include: 1) Do the experiment in a vacuum. This would avoid any chance of wind affecting the trolley, and also eliminate air resistance. 2) Make the wheels and bearings of the trolley so smooth that there is no friction. This is highly implausible, but it would increase the accuracy of the result. 3) Use a laser timing system so that the ticker tape cannot cause friction as it passes through the ticker timer, or air resistance as it lags behind the trolley. 4) Measure all results to a large degree of accuracy. This would obviously improve results. All these methods could be used, although they are very extreme and somewhat irregular. They would also need very sophisticated equipment, which could probably be used for a better purpose. Considering the equipment I used, and the circumstances in which I worked, I believe that my results are adequate to prove that energy is converted from one form to many others, as the trolley moves down the ramp. Mike Games GCSE Physics Coursework ...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. What affects the acceleration of a trolley down a ramp?

    the experiment I did to be fairly accurate and to provide enough evidence to support a firm conclusion. I know that my results are accurate because I could compare them to my predicted results to see whether they were right or not.

  2. Physics Lab - Conservation of momentum

    Even though momentum is conserved in inelastic collisions, one cannot track and measure the kinetic energy as it is converted into other forms. Therefore the momentum may have been conserved, but just not measured as it was converted possibly into heat & sound energy.

  1. An investigation into the acceleration of a trolley up a ramp.

    How will the equipment be set up and used? Method * Use Books or stand to increase incline of ramp to 15�. Measure the incline using protractor. * Attach pulley to edge of ramp, ensure that this end is placed off the edge of bench so that the mass has a decent distance to fall.

  2. An investigation into factors that effect the braking distance of a trolley

    is rolling down the ramp from a certain height where it has G.P.E. to a height where it has K.E, the G.P.E. at the top of the runway should equal the K.E. at the bottom. This equation can be used to work this out: Maximum kinetic energy = maximum gravitational

  1. Squash Ball and Temperature Investigation

    o The height at which the ball is dropped. Even though a metre rule was used, holding the ball exactly at a metre was difficult as the metre rule was set up on the bench and we could just barely reach above the metre point.

  2. Investigating the Factors Which Affect the Motion of a Trolley Down an Inclined Plane

    It prevents objects moving or slows them down; ii) It produces heat when two objects rub against each other. iii) It wears things out as surfaces rub together. In our investigation we hope to reduce friction by using a dynamic trolley, however this is not 100% possible. However, friction can be reduced by the use of: - Bearings, - Lubrication, - Streamlining.

  1. invetigation:Principle of conservation of energy in terms pe and ke

    by the law of conservation of energy, height, h, at which trolley is placed from the reference point represents the gravitational potential energy possessed by the body. When the trolley is rolled down the ramp, the gravitational potential energy is converted into kinetic energy, where the kinetic energy is calculated from the velocity of the trolley down the ramp.

  2. Observing The Law of Conservation of Momentum

    Time Reading 2 (� 0.01 s) Average Time Distance (� 0.05 cm) Velocity Mass (� 0.01 g) Momentum A 2.25 2.44 2.345 161 68.65672 0.5 34.3283582 B 2.25 2.44 2.345 51 21.7484 0.5 10.8742004 Total Momentum (2 d.p.): 45.2025586 After the Collision Trolley Time Calculation Time Distance (� 0.05 m)

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