postlab 3

# postlab 3 - the system to the other during the experiment...

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Post lab 3 Sara Irshad 1. One of the pulleys rotates through the photogate to measure the angle through which the wheel turns as a function of time. If the wheel turns through an angle, , the string (which moves with the wheel) moves a distance, d=R , where R is Ɵ Ɵ the radius of the wheel. The probe software can give us either theta versus time or d versus time. It can also use this data to compute the velocity of the masses versus time. 2. Air resistance, Pulley friction, Pulley mass and String mass. 3. Using a heavier string would cause an overall upward curvature of the v-t graph (see picture below) because a heavier string is like adding an extra small mass to the system. However, the center of gravity of the string moves from one side of
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Unformatted text preview: the system to the other during the experiment. Meaning at the beginning of the run most of the mass of the string is on the side of m1, but at the end of the run most of the mass of the string has shifted to the side of m2. The acceleration decreases as the mass of the string is gradually shifted from m1 to m2 because the string mass provides extra inertia aka air resistance to acceleration on the side it is effecting. Thus, as the mass of m2 increases by adding the mass of the string, air resistance increases which decreases acceleration. 4. μ = m1/m2 (See below for diagrams and calculations)...
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