Part I: Moving Along a Track Two masses are connected with a string and a pulley

Question

Part I: Moving Along a Track Two masses are connected with a string and a pulley on a track. Let's assume that we have a system with ideal frictionless track, ideal massless string and ideal massless pulley. m1 track m2 1. Consider m1 alone. What are the forces acting on m1? Are they doing any work? Positive or negative? Which force(s) is conservative? Which is non-conservative? Is the total energy (E KPE) of m1 conserved? (Draw a free body diagram if necessary) Consider m2 alone. What are the forces acting on m2? Are they doing any work? Positive or negative? Which force(s) is conservative? Which is non-conservative? Is the total mechanical energy of m2 conserved? (Draw a free body diagram if necessary) 2.

Explanation / Answer

1. force acting: Tension

normal force due to track

Weight force due to gravity

Forces doing work : tension (positive)

2. Force acting: Tension

Weight due to gravity

forces doing work -> Tension (-ve work)

weight (+ve work)

3. Tension in internal force.

External: normal force on m1 (no work )

weight force on m1 (no work)

weight force on m2 (+ve work)

No non-conservative force.

so total mechanical energy of system will be conserved.

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