physicslabweek1and2spring.doc - Physics lab 1 Spring quarter ROTATIONAL DYNAMICS Objectives Study the relationship between force lever arm and torque

physicslabweek1and2spring.doc - Physics lab 1 Spring...

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Physics lab # 1. Spring quarter.ROTATIONAL DYNAMICSObjectivesStudy the relationship between force, lever arm, and torque; study how torques addStudy the conditions for static equilibrium of a rigid bodyStudy the concept of “center of gravity”PART A. Static Equilibrium of Rigid Bodies: The Roman balanceIntroduction The torque created by a force F with respect to a certain axis of rotation is= F xdwhere dis the lever arm, which is the perpendicular (shortest) distance between the axis of rotation and the line of force. Static Equilibrium: In order for a rigid body to stay in equilibrium, the net force and the net torque on the object must both be zero. We usually only deal with motion of objects in two dimensions, in which case the conditions for static equilibrium areFx = 0, Fy = 0, = 0Center of Gravity: For a rigid body with finite size, the force of gravity acts on all parts of the body. But for the purpose of studying the translational motion of the body as a whole or the static equilibrium of the body, we can assume that the entire weight of the body acts at a single point. This point is the center of gravity. When we draw the force diagram for a rigid body, we can put a single force of gravity at the center of gravity.Experimental SetupEquipment: torque apparatus, hangers, weightsThe apparatus consists of a meter stick suspended from a fulcrum. Weights may be hung from the meter stick at various positions along the stick by means of hangers in order to apply torques.A steelyard balanceis a straight-beam balance with arms of unequal length. It incorporates a counterweight which slides along the calibrated longer arm to counterbalance the load and indicate its weight. A steelyard is also known as a steel-yard, steel yard, common steelyard, Roman steelyard, or Roman balance.
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A 19th-century steelyard.
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  • Spring '17

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