# Physics practical Essay

Published: 2020-02-25 10:40:58
618 words
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Category: Oxalic Acid

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To conduct an experiment to investigate the effect of changing the mass of an object has on its acceleration when it is acted on by a constant force. Hypothesis I think that when the force is constant, the heavier the mass is the less acceleration whilst when the mass is lighter the most acceleration will occur. Apparatus Pulley Bob mass Weights Fishing line Trolley GLX data logger Accelerometer Scissors Ruler Chocks Method 1. Attach the pulley to the end of a table 2. Set up the accelerometer and the GLX data recorder 3. Record the initial mass of the trolley 4.

Tie the fishing line to the end of the trolley and the other end to the hanging mass. 5. Lay the line over the pulley, and align the trolley so it will run straight 6. Place the accelerometer behind the trolley so it will record the acceleration by measuring the distance 7. Have the trolley pulled back far enough to allow an accurate reading for the accelerometer and a person at the end to stop it falling from the table 8. Run 5 trials per mass and record the values for acceleration 9.

Repeat steps 7-8 for 700g, 800g, 900g, 1000g, 1100g, 1200g, 1300g, 1400g, 1500g Diagram of Investigationtrolley fishing line accelerometer pulley bob mass table GLX Data Collection and Processing Table 1: Collection of Data for the acceleration of different masses Mass of trolley (g) Acceleration (ms2) i?? 0. 01 Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Average 600 Example of equation for average acceleration for 600g Average = = 2. 74 ms2 Table 2:

Force applied Mass (kg) Force Example of equation for force applied for 600g F = ma F = 0. 6 x 2. 74 F = 1. 644 Graph 1: Acceleration against mass According to Newtons second law of motion, when the force is constant (F = ma), the acceleration will increase as the mass decreases and the acceleration will decrease as the mass increases. m = F/a Conclusion and Evaluation.

The aim of this experiment was to conduct an experiment that investigated the effect of changing the mass of an object and how it affects the acceleration when it is acted on by a constant force. We successfully conducted the experiment, with the minimal amount of random error possible. We trialled each mass five times in hope to find an accurate average of the acceleration and then calculated the force using Newtons second law of motion F = ma. When the acceleration was plotted against the mass it showed a linear trend, where as the mass got smaller so did the acceleration required.

Contrastingly, when the force was plotted against the mass, the line of best fit was a cubic function. Table 3: Future improvements upon errors within the experiment Error or Limitation Significance Future Modifications Human error Different readings of measurements and releases of the trolley will render the data inaccurate Use the same person for each aspect of the experiment to minimise inconsistency Random air currents Air currents can affect the experiment because the reading on the weight scales may be different because of the pressure from the air and the wrong amount Oxalic Acid is used.

Close all doors and make sure the air-conditioning is turned off before the experiment is started Number of trials Because the acceleration only tested 5 times per mass, an accurate measurement of the acceleration could not be obtained because it did not take into account random errors that may affect the results of the experiment Carry out the experiment until the values only differ only one percent of each other Equipment Manufactured products are not exactly the same, and different products will change the outcome of the experiment. eg. one trolley may not be the exact weight of another Use the same equipment for the whole experiment.

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