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Falling parachute experiment

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Introduction

Falling Parachute Experiment Aim To investigate the motion of objects for which the air resistance is quite large. Introduction Free fall is a special type of motion in which the only force acting upon an object is gravity. Objects that are said to be undergoing free fall, are not encountering a significant force of air resistance; they are falling under the sole influence of gravity. . Under such conditions, all objects will fall with the same rate of acceleration, regardless of their mass [1]. W = mg where W=weight (N); m= mass of object (kg); g=gravitational acceleration (m/s2). The amount of air resistance depends upon the speed of the object. A falling object will continue to accelerate to higher speeds until they encounter an amount of air resistance that is equal to their weight. ...read more.

Middle

After that, a paperclip was added to the end. Then the parachute was dropped from a fixed height and the time it took to fall to the ground was simultaneously being recorded. The action was performed three times to get different values of time taken and to get the average figure. Subsequently, the second paperclip was added and the method was continuously repeated until the fifth paperclip was added. Diagram 1. The arrangement of apparatus [2] Number of paperclips Time to fall � 0.1 (s) Average (s) Total mass � 0.0005(kg) Total weight * (N) 1st drop 2nd drop 3rd drop 1 0.001 0.0098 4.1 3.9 3.4 3.8 2 0.002 0.0196 2.4 2.6 3.2 2.7 3 0.003 0.0294 2.5 2.7 2.4 2.5 4 0.004 0.0392 2.2 2.2 2.2 2.2 5 0.005 0.049 1.3 1.4 1.7 1.5 Result * The total weight W = mg with g = 9.8 (m/s2) ...read more.

Conclusion

The height of 2 meter was chosen since the figures of time taken to fall were bigger so the changes were more significant and the action of measuring with the countdown clock was more accurate. The parachute was hold and dropped by the first group member and the clock was timed by the other member. During the experiment, the parachute sometimes surprisingly flew on the incorrect direction and got on the table. The other possibilities of errors might be the slow reaction of the clock holder, the non-zero error of the ruler due to the ledge at the bottom of the wall. There are several ways to reduce the errors. First is to do the experiment in a closed room in order to have no wind inside. Secondly, choose a wall that has no shelf at the bottom. Finally, use a light-gate instead of countdown clock. ...read more.

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4 star(s)

Response to the question

This answer is OK but far from perfect. It is customary to put a hypothesis or prediction from theory of what you expect to happen and then link back to it in the conclusion. The use of some phrase such ...

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Response to the question

This answer is OK but far from perfect. It is customary to put a hypothesis or prediction from theory of what you expect to happen and then link back to it in the conclusion. The use of some phrase such as force of gravity are confusing and should be avoided, using weight helps to make it clear. The work is very well presented and clearly well organised.

Level of analysis

There should be greater emphasis on the meaning of this result for example what the gradient of the line represents. It has been shown the weight of the object is inversely proportional to the time for it to fall but there is no mention of what this could mean - this is where it would be good to refer back to an earlier hypothesis or theoretical expectation. There is some qualitative explanation of errors but these aren't calculated numerically and don't show as error bars on the graph. This would make it easier to assess the reliability of the report and, hence, its significance.

Quality of writing

The quality of writing is good. Clearly organised and visually very well presented this report was only really let down by its conclusions.


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Reviewed by k9markiii 25/07/2012

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