Terminal Velocity Lab Report

Topics: Mass, Mathematics, Weight Pages: 5 (377 words) Published: December 3, 2014


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. Variables
Independent Variable: Volume of oil
Dependent variable: Time taken
Controlled variable: Weight of marbles
Apparatus & Materials
1. Measuring cylinder
2. Oil
3. Weighing machine
4. Marbles of different sizes
5. Timer
6. Paper
7. Pen
8. Calculator
method & procedure
1. Get apparatus ready on a clear table.
2. Get

Data

Calculations
Time taken*length of cylinder = terminal velocity
Small marble
1st trial – 0.002*18
=0.036
2nd trial – 0.015*18
=0.27
3rd trial – 0.016*18
=0.288
4th trial – 0.035*18
=0.063
Average: 0.657/4
= 0.16425
Medium marble
1st trial – 0.015*18
=0.27
2nd trial – 0.056*18
=1.008
3rd trial – 0.028*18
=0.36
4th trial – 0.02*18
=0.36
Average: 1.998/4
=0.4995
Large marble
1st trial – 3.35*18
=60.3
2nd trial – 3.38*18
=60.84
3rd trial – 3.13*18
=56.34
4th trial – 3.11*18
=55.98
Average: 58.365

data analysis
The first graph shows how the time taken to reach the bottom of the measuring cylinder increases with increasing mass. The second graph shows that the terminal velocity, too, increases as the mass of the marble increases. conclusion

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 the terminal velocity for the larger marble is higher may be due to the size difference. 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
Research the formula and calculate it accordingly
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