Linear Motion Lab Report

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This lab was designed to find the moment of inertia needed for the rotational inertia apparatus to set it in motion. By attaching different masses to a string which set the apparatus in motion, the change of angular speed over time was first measured using the iPhone app PhyPhox. Subsequently the angular acceleration was calculated. The more masses were added the faster the system rotated. For each setting the torque was calculated by multiplying the mass, gravitational acceleration and the radius together. Now it was possible to plot a graph Torque vs. angular acceleration where the slope represents the Inertia. In this case it turned out to be 0.0025 N. Introduction: The purpose of this paper was to find out the effect that different masses…show more content…
PhyPhox stand for Physical Phone Experiment and uses the sensors of the phone. In our case the Gyroscope to measure the rotation rate (w) in rad/s. For more details, please visit www.phyphox.org Calculation of acceleration () Acceleration=∆ω/∆t Newton’s three Laws of Motion The First Law of Motion states, “A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an external force.” This simply means that things cannot start, stop, or change direction all by themselves. It takes some force acting on them from the outside to cause such a change. This property of massive bodies to resist changes in their state of motion is sometimes called inertia. The Second Law of Motion describes what happens to a massive body when it is acted upon by an external force. It states, “The force acting on an object is equal to the mass of that object times its acceleration.” This is written in mathematical form as F = ma, where F is force, m is mass, and a is acceleration. Applying the second law of motion for rotation, the angular acceleration would be proportional to the net torque and inversely proportional to the moment of inertia.

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