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# The problem that is to be investigated is to see if the mass of a trolley going down a ramp affects the stopping distance.

Extracts from this document...

Introduction

GCSE COURSEWORK PHYSICS

## Planning

The problem that is to be investigated is to see if the mass of a trolley going down a ramp affects the stopping distance.

I know from my own knowledge that the stopping distance will increase if the mass of the mass of the trolley is increased and the braking force is kept constant. This is because the mass of the trolley will help the trolley speed up as it is rolling down the ramp. When the brakes are applied at the same force the trolley becomes harder to stop.

Factors:

• Braking force
• Mass of trolley
• Height of the ramp
• Friction

Braking force – the more the braking force is then the more it is the less the stopping distance will be. This is because the harder a car brakes the quicker it stops. This will be tested to find a final braking force and then will be kept constant during the final experiment.

Mass of the trolley – the heavier the trolley is the faster it will go downwards on the slope of the ramp. This is because the gravity will pull the car down and if the car weighs more then the gravity will have a larger effect on it pulling it down at a fast speed. The mass will be the test factor so therefore will not stay constant and will be changed.

Middle

Stopping distance

1kg

829g

9cm

700g

829g

12cm

500g

829g

13cm

300g

829g

17cm

1kg

829g + 3866g

35cm

700g

829g + 3866g

68cm

500g

829g + 3866g

87cm

300g

829g + 3866g

1m

Conclusion

From this experiment we have gathered that the perfect braking force will have to be 500g. This is because the braking force of 1kg was blatantly too big because the trolley instantly flipped backwards. 700g was also too big for the trolley to be stopped with a fair deal of distance. 300g was too small a force for the mass when extra mass was added. 500g was ideal as it worked for the smallest mass of the trolley and also the largest.

## Obtaining Evidence

There were no additional changes made to the planned method. The same idea was used but I started of with the measuring of the length of the ramp and also the height and angle of it. The length of the ramp was approximately 80cm and the height was approximately 19cm.

Conclusion

## Evaluating Evidence

I think that most of my method for carrying out the experiment was a good way to do it because the results reflected what was expected by the scientific theories. I think that the way the trolley was released from the same place was good because everytime the trolley was released it was from the same place and therefore the results were made more accurate. I also thought that the position where the brakes were applied was also kept the same everytime by making sure the string, which was acting as the brakes, was always the same length. However I believe that if I were to do the experiment again I would try to use a different way to measure the stopping distances because our eyes are not too accurate to see the exact place where the trolley became stationary and started to go back. I know this because during the experiment I found that it was very hard to be accurate when marking the runway. I am sure that the results I gained however were easily reliable enough to make a conclusion from because they weren’t many anomalous results and the results showed why what was achieved.

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