INTRODUCTION: The work-energy theorem simplifies the analysis of many dynamic sy
ID: 2238428 • Letter: I
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INTRODUCTION: The work-energy theorem simplifies the analysis of many dynamic systems, especially when the work of non-conservative or dissipative forces such as friction is zero and the work of external forces other than gravity is zero so that the mechanical energy of the system is conserved. Consider a system consisting of a glider on an inclined air track connected with a piece of light magnetic recording tape running over a "frictionless pulley" to a small hanging mass as shown in Figure 1. The "pulley" on the air track is designed to approximate a frictionless pulley. Air is blown through small holes in a curved surface under recording tape. The tape is supported over the entire curved surface of the pulley by an almost frictionless cushion of air. Be sure sufficient air is flowing out through holes in the "frictionless air pulley" on the end of the track. This can be ensured by fully opening the valve at the base of the frictionless pulley. When the small mass is allowed to drop, the glider is pulled up the incline. There are no significant frictional losses in the system so the motion can be analyzed in terms of the changes in gravitational potential energy and kinetic energy. The falling mass (m) loses potential energy which results in a gain of kinetic energy of both masses and increased potential energy of the glider mass (M). 1. Consider a set-up similar to that in the experimentExplanation / Answer
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