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# Investigate the relationship between GPE (Gravitational Potential Energy) and KE (Kinetic Energy) for a trolley or ball rolling down the slope.

Extracts from this document...

Introduction

GCSE PHYSICS

Coursework

Data Analysis/Handling-Investigation

To investigate the relationship between GPE (Gravitational Potential Energy) and KE (Kinetic Energy) for a trolley or ball rolling down the slope.

Candidate Name: Leah McDonald

Centre Name: Dunraven School

Candidate Number: 7125

Centre Number: 10920

Strategy

We were asked to complete an investigation into the energy associated with a trolley rolling down a slope. At first I wasn’t sure exactly what question I wanted to investigate so I carried out the following preliminary investigations:

Preliminary   Experiment 1:

Time= 1.28 seconds

Average Velocity =50.0/1.28

Using a stop timer still leaves

Human error,-human reaction

Time.

Preliminary Experiment  2:

Time=678.49 ms(milliseconds)

1 second = 0.001 ms

Time=0.67849 seconds

Average Velocity =0.50

0.67849

0.73 m/s

NOTE:  The data logger was set to ‘timing

and then ‘timing from A to B’

Preliminary Experiment 3:

Time= 7.36 milliseconds

Instantaneous Velocity= 0.01

0.00736

=1.20 m/s

NOTE:  The data logger was set as ‘timing’ and then ‘timing at A’ mode

After completing

Middle

0.17081

Average:

0.16516

 Height (m) Length (m) Time (ms) Average Speed (m/s) Final Speed (m/s) 0.15 0.5 3201.70 0.15617 0.31233 0.15 0.5 3214.50 0.15555 0.31109 0.15 0.5 4125.67 0.12119 0.24238 0.15 0.5 3633.79 0.13759 0.27519 0.15 0.5 2488.46 0.20093 0.40185 0.15 0.5 4740.25 0.10548 0.21096 0.15 0.5 5631.79 0.08878 0.17756 0.15 0.5 5434.65 0.09200 0.18400 0.15 0.5 4856.03 0.10296 0.20593 0.15 0.5 3234.97 0.15456 0.30912 Average: 0.26304
 Height (m) Length (m) Time (ms) Average Speed (m/s) Final Speed (m/s) 0.20 0.5 665.00 0.75188 1.50376 0.20 0.5 713.86 0.70042 1.40083 0.20 0.5 758.72 0.65900 1.31801 0.20 0.5 575.50 0.86881 1.73762 0.20 0.5 662.19 0.75507 1.51014 0.20 0.5 574.88 0.86975 1.73949 0.20 0.5 693.07 0.72143 1.44286 0.20 0.5 681.26 0.73393 1.46787 0.20 0.5 657.97 0.75991 1.51983 0.20 0.5 670.39 0.74583 1.49167 Average: 1.51321
 Height (m) Length (m)

Conclusion

For my results, I cannot say that V₂ is proportional to H. I expected to see that V₂ was proportional to H because: KE =GPE

1/2mv₂ =mgh

1/2v₂=gh

v₂=2gh

Evaluation

Throughout the method, the problems I faced were that the timings I got were largely scattered which is not what I expected. This may have been because it was difficult to position the trolley right next to top of the Light Gate without starting the timer (Interrupt Card).

To improve the method in future, it may work better to mark the start point for the trolley, so I know where to position it each time.

Assessing my results, I am confident that Graph 1 is accurate and reliable, because it shows a smooth curve of best fit, which is what I was aiming to see. However, I am aware that Graph 2, is not reliable as it did not show a straight line of best fit.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

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## Here's what a teacher thought of this essay

3 star(s)

This is a reasonable attempt at a report, although the report also lacks detail.
1. The preliminary investigations lay out the practical well but need to be fully explained.
2. The table of results is well presented.
3. The beginning of the report is missing several sections.
4. The conclusion is very brief and therefore incomplete.
5. The evaluation makes claims that are not true.
*** (3 stars)

Marked by teacher Luke Smithen 29/05/2013

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