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Background Information Terminal velocity is when a falling object reaches a constant velocity due to a balance in the forces of weight and air resistance. In this experiment, we dropped marbles of difference weights in 100 ml of oil to calculate their terminal velocity. Research Question How does the mass of an object effect its terminal velocity? Aim Our aim is to measure the terminal velocity, of marbles of different masses, in oil. Hypothesis Objects of larger mass will take longer to reach the bottom of the cylinder, whereas objects of lesser mass will take less time to reach the bottom of the cylinder.

The second graph shows that the terminal velocity, too, increases as the mass of the marble increases. Inclusion The results of this experiment prove our hypothesis correct. Our hypothesis predicts the terminal velocity to increase as the mass of the marble increases. As seen in Graph 2, this is in fact the case. Evaluation Weaknesses: We did not take into account the circumference of the larger marble, which was almost the same as the circumference of the measuring cylinder. So the reason he terminal velocity for the larger marble is higher may be due to the size difference.

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Some results were not properly recorded, leading to confusion during the data processing. The formula for terminal velocity we used might be wrong due to the fact we have never learnt about it. Strengths: Data processing skills and calculation Group work; everyone was assigned a task that they stuck to throughout the entire experiment. Improvements for the future Rechecking the results before the experiment is over.

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