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In this investigation I will investigate the relationship between force, mass and acceleration. Force is proportional to acceleration because if I push a trolley harder the acceleration is higher.

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Introduction

Peter Luetchford        Science GCSE Physics Coursework        Thursday 4th July

How Force Effects Acceleration

Planning

In this investigation I will investigate the relationship between force, mass and acceleration. Force is proportional to acceleration because if I push a trolley harder the acceleration is higher. If I put something in the trolley then the acceleration would lower so the mass is inversely proportional to the acceleration.

Force  Acceleration

Force  Mass-1

The formula could be rewritten as:

Force = Mass x Acceleration

         (N)   =  (Kg)  x      (m/s2)

This investigation will attempt to prove this formula in a practical. To calculate the force I will use gravity acting on weights as shown in my diagram below. 100 g will give a force of 0.98 N. Mass can be measured on a scale. Acceleration will be measured using a light gate as shown below. The formula for acceleration is:

Acceleration = Change in speed / time

                             (m/s2)      =           (m/s2)        /  (s)

The formula for speed is:

Average speed = Distance / time

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Middle

Mass of

Acceleration of trolley (m/s2)

Predicted mass

Mass of

Weights (g)

Force (N)

1st Test

2nd Test

Average

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Conclusion

Evaluation

The procedure I used worked and gave good constant results. This is clear when you look at the results and notice how close the results are to the line of best fit. It would be more accurate if I had repeated the test more times. The procedure was suitable however inaccuracies occurred because not only did the trolley accelerate but so did the weight. To improve this experiment I would then have to only have one thing accelerating such as a falling object. There is also friction which could be lowered by using thinner wheels and a more streamline trolley. A falling object would also get rid of friction between the slope and the trolley and air resistance could be calculated out of the experiment. The evidence is constant and is so sufficient enough to support the conclusion. It would be more accurate if I had repeated the test more times. Additional data could be collected to further my investigation by changing the weight of the trolley or changing the force.

        Page

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