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# Physics Practical

Extracts from this document...

Introduction

Physics Internal Assessment

Aim

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

Middle

GLX

Data Collection and Processing

Table 1: Collection of Data for the acceleration of different masses

 Mass of trolley (g) Acceleration  (ms2) ±0.01 Trial 1

Conclusion

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

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 star student thought of this essay

4 star(s)

### Response to the question

This is a good example of coursework, however it makes a few minor mistakes. The student has answered the question of how the mass of an object affects its acceleration very well. He has made a table which accurately shows ...

### Response to the question

This is a good example of coursework, however it makes a few minor mistakes. The student has answered the question of how the mass of an object affects its acceleration very well. He has made a table which accurately shows that as the mass increases, the acceleration decreases. He also made a graph of his results which comes out as a straight line, showing that the result is linearly proportional. Be careful not to conclude it is directly proportional, as for it to be directly proportional it would have to go through the co-ordinate (0,0) which it does not. I would also of recommend that he could of worked out the gradient of his graph to see how much mass affects acceleration.

### Level of analysis

The student shows appropriate analytical skills, they have first made a prediction based on theory and have in their conclusion tied their results to theory as is a good idea as it will help understanding and improve the quality of the coursework. They however should of made sure that the force was constant in their experiment, as you should make sure all variables other than your independent and dependent variables are controlled, and this varying force could make the experiment indicate incorrect results. After doing this they could also work out the force by working out the area under the graph, since F=ma, and the graph was m against a, the area will be the force.

### Quality of writing

The student's spelling and grammar are fine and they have followed convention by putting their independent variable on the x axis as they should, and the dependent variable on the y axis. Be careful to make sure you follow this convention. They have also made sure to repeat their results 5 times and work out an average, and clearly laid out their method before doing the experiment which is very helpful to ensure that the experiment goes smoothly. You donÃ¢â‚¬â„¢t want to get to the point of doing the experiment and then not be sure what to do.

Reviewed by jackhli 28/02/2012

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