IB Physics Internal Assessment
Andy Tang
Research Question
In this internal assessment, I am given a cantilever to find the physical properties of it. I decide to investigate the relationship between the force I act on one side of the cantilever and the maximum acceleration the tail can reach. This experiment will be also showing the elasticity of the cantilever. Since I pull down one side of it and fixed the other side, when I cut the string, it will bounce up and down until all the internal energy is depleted.
Text books
Newton meter
Accelerometer
Equilibrium line
Materials 1) A piece of cantilever that is made by acrylic plastic (length:35.2cm±0.1; Width:4.0cm±0.1; thickness:0.2cm±0.1) 2) An accelerometer (sensor;
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By considering the formula: Ep=kx2/2, when x (the displacement caused by deformation) cannot be changed any more, the potential energy will not be changing. When there is no more energy added into the system, the acceleration will not change.
Raw Data Table Force (N±0.05) | Acceleration (ms^-2)(±0.2) | | Trial 1 | Trial 2 | Trial 3 | | max | min | max | min | max | min | 0.75 | 22.3 | -18.5 | 21.2 | -15.3 | 25.7 | -26.1 | 1.00 | 40.6 | -36.3 | 36.9 | -42.5 | 35.6 | -35.2 | 1.25 | 48.7 | -43.4 | 46.6 | -37.2 | 40.7 | -39.3 | 1.50 | 52.7 | -55.6 | 52.0 | -41.7 | 49.1 | -45.9 | 1.75 | 55.3 | -52.7 | 57.3 | -53.0 | 50.2 | -48.3 | 2.00 | 64.7 | -57.5 | 66.8 | -55.0 | 65.6 | -56.1 | 2.25 | 69.8 | -59.7 | 67.3 | -61.2 | 65.3 | -63.2 | 2.50 | 78.0 | -63.8 | 68.0 | -63.8 | 64.3 | -62.8 | 2.75 | 74.7 | -63.8 | 83.8 | -63.8 | 83.7 | -63.2 | 3.00 | 83.8 | -63.8 | 83.1 | -63.8 | 83.6 | -63.8 |
Force uncertainty: The least count of the Newton meter that I used is 0.25N. Although the interspace of each scale is wide enough for me to determine, I was not able to control the tension force which I act on the Newton meter. This created the uncertainty of the force measurement. By noticing the fluctuation of the indicator, I estimate the uncertainty of the force is about 0.05N.
Acceleration uncertainty: The data of the acceleration were
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The pendulum was pulled to about 15 cm from the motion detector. In case of the mass on a spring, the mass was pulled till just a few inches away from the motion detector.
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2. No, the forces went in equal and opposite directions just as the rubber band and string
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Purpose: The purpose of this Physics Lab is to investigate what factors determine the amount of flexion of the cantilever. Hence, the objective is to establish a relationship between the length of a cantilever, which may give some insight into the physics of cantilevers.
When one surface of the cantilever undergoes a surface stress change, the cantilever bends accordingly upward or downward depending on