• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9

Efficiency of energy transfer on a rolling object

Extracts from this document...


Holly O’Nione 11HO

 Aim: To investigate the efficiency of energy transfer on a rolling object.

To do this I will investigate the input variable which is the factor we’re changing. I shall change the height of the slope, which therefore means the input variable is the gravitational potential energy (G.P.E) as the height moved affects it.


I predict that the transfer of energy will be more efficient the steeper the slope gets. This is because as the slope gets steeper, the marble will rotate less and less (so less rotational energy) and make less and less contact , and when the slope has a gradient of 100%, the marble will not rotate at all, but just fall straight down.  


The marble’s energy changes from G.P.E, as it falls vertically, to kinetic energy. However, as it comes down the slope it rotates. Some energy is lost as rotational energy.

G.P.E = K.E + Rotational Energy

Therefore I will need to measure the velocity at the bottom as there is no Kinetic Energy (K.E) or rotational energy is at the top.

I will need to find out the efficiency of the energy transfer from G.P.E to K.E. The formula is:

Efficiency = Useful energy transferred (KE) x 100

                   Total energy supplied (GPE)

To work this out I need to know the G.P.E the marble has at the top (therefore the maximum G.P.E)

...read more.


th of a second and the time I will repeat the timing five times for each height and use the average of these five results. This will make the investigation reliable as it will reduce the effect of anomalous results.  

When I record the time it will be made to two decimal places as the stopwatch limits me by only showing this amount of accuracy.  For length and height it will be measured in metres to the nearest millimetre (three decimal places) because this is quite easy to see on the ruler. This is as accurate as the ruler will allow.

Before I do my actual investigation, I shall carry out a preliminary experiment in order to see if I need to make changes to my plan.  The preliminary procedure will include three heights:

0.200m, 0.400m and 0.600m

I shall do 5 repeats for each and work out an average and the efficiency which should not exceed 100%.

Results for Preliminary Procedure

Height (m)

Time 1 (s)

Time 2 (s)

Time 3 (s)

Time 4 (s)

Time 5 (s)

Avg Time (s)

Efficiency (%)

























This shows what I expected as the efficiency increased each time. Therefore I should keep the same amount of repeats. However, I should do more measurements with a greater range (8 measurements) and smaller interval (0.100m). In my actual investigation I shall use the following heights:






...read more.


This is probably because I was more alert at the beginning of the experiment and so my reaction time was shorter. Apart from this I cannot see any reason why the first readings I took were anomalous.

However, I do think that my evidence is valid because I kept all factors which could affect the experiment constant apart from the input variable of the height.

 I do not think that I have collected enough evidence to fully support my conclusion.  In order to do this, I must do the experiment again. Next time I shall use a larger range of heights so I can see if the trend continues.  Also, if there is a larger range, an anomaly will not show up as obviously on the graph.  I would not repeat the experiment any more than I did this time as more repeats wouldn’t affect the average much more.

I did not have many difficulties in this experiment except with the timing. If I were to do this experiment again, I would use light, motion or pressure sensors which are connected to a computer to record the times. I would do this because a computer’s reaction time is very accurate.

 To obtain more evidence to support my conclusion, I would use a greater range of heights. Another way to do this is to shorten the intervals. The experiment would still have a range of heights from 0.100m to 0.800, but it is conducted every centimetre instead of every ten centimetres.  This would make the trend much clearer. Therefore, this would make the trend and therefore my conclusion clearer.

...read more.

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. Marked by a teacher

    Investigate the relationship between GPE (Gravitational Potential Energy) and KE (Kinetic Energy) for a ...

    3 star(s)

    It also showed me that keeping the length of the starting point on the ramp the same was a reasonable decision.

  2. To investigate how the angle of a slope affects the acceleration of a marble.

    9.81m/s The new graph is as I predicted and shows my data follows the same basic curve as the theoretical results. However all of my data is slower accelerating than the theoretical set. This is because the theoretical set ignores friction.

  1. Factors Affecting the Speed of a Car after Freewheeling down a Slope

    EVALUATION Analysis of my results shows my procedure to be fairly accurate as it follows the general pattern seen in the theoretical results used. However as the results plotted on the graph in my experiment has shown certain readings outside the line of best fit indicating errors in my recorded results.

  2. Investigation into the range of a ski jump

    In these circumstances we can say that air has the properties of a liquid, when an object is pushed through a liquid, the liquid pushes back against the object with a force as the object moves through the liquid. The liquid is pushed to the sides of the object, this pushing requires force, so energy is lost from the ball.

  1. Investigation into factors affecting the speed of a car rolling down a ramp

    Also to keep it fair, I must make sure that the ticker tape is always equidistant from the sides of the ticker timer as the car rolls down the ramp.

  2. The aim of this experiment is to obtain the efficiency of a supplied catapult.

    By conducting a small experiment on the elastic used in my catapult in which I will measure values of force against extension, I will be able to plot a graph and calculate the area underneath in order to obtain a value that will represent the elastic energy in the material.

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

    of a ramp, the summit being 20cm from the ground, and then is released. It rolls all the way down the ramp, of 2 metres, before it collides with the wall at the bottom. A couple of keen scientists thought it would be interesting to record the time taken for

  2. Investigate a factor that might affect the size of a crater made by a ...

    so it's size was increased by 50g to 200g which seemed a good weight as the crater was then neither too small or too big. The pre - testing proved that using plasticine with wet sand was a bad choice unless something could be done to eliminate some of the

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