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Feminist Physics Lab Report

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The photo is of a 44.5 Newton (10 pounds) weight being lifted using the biceps brachii mucle of the arm. It is taken in the Rudolf Fitness Center at Gonzaga University. Many physics concepts come together in the simple motion of lifting a weight, even if its relatively lightweight. Each muscle in the arm must work individually in order to collectively achieve a motion. I will explain the torque produced by each muscle and how that contributes to the force and velocity needed to lift something. This motion also includes moment arms and vector addition to account for the forearm arm moving about the axis of rotation in the elbow. Physics can be used to calculate how much force the biceps generate to lift a certain amount of weight. This picture …show more content…
While the arm is at 90 degrees, the torque is calculated by separating the forces into components. The forces of each component is found by multiplying the x or y component, respectively, by a trig function. For example, there is no horizontal (x-axis) force on the arm while it is resting at the horizontal because the cosine of 90 is zero. However, there is a vertical component because the sine of 90 is equal to 1. By multiplying the force by the vertical component of 1, the vertical force can be calculated. Multiplying this force by the internal moment arm will produce the torque generated by holding the arm at 90 ninety degrees. Once the angle of the arm begins to change, the angle of insertion of the biceps muscle on the forearm will also change. The changing angle will influence the force components because of the trig functions needed to calculate them. For example, if there was a thirty degree angle, the x component would be computed using cos(30) * Force. The cosine of 30 is equal to .87, so there would be an x component, unlike when the angle is set to 90 …show more content…
They all must work together to compose a single, relatively simple motion. Each muscle has its own torques, moment arms, angles, and forces that contribute to calculations showing how stationary lifting is possible. Without gravity, there would be no weight pulling down on the arm. Therefore, there would be a lack of force pulling downward. This means that there would be no need for an equal and opposite force pulling upward by the muscles in the arm. The accurate forces can only be discovered by splitting each force into its respective components because a single more cannot be applied to angles. Changing the angle of the arm, will change each force acting on the free body diagram because of the trig functions used to compute the force

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