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Classical Mechanics (friction, work, energy & power)

Set of 11 problems on classical mechanics (friction, work, energy & power).

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(Please refer to the attachment for figs)

1. Tension in the rope can be resolved into components Tcos(theta); horizontal and Tsin(theta); vertical. Vertical component does zero work as there is no vertical displacement. Horizontal component does work given by : W = Tcos(theta) x Displacement

Substituting values we get : 247 = 40cos(theta) x 7 or cos(theta) = 0.882 or theta = 28 degrees

2. Work done by the applied force = Applied force x Displacement = 7.6 x 15 = +114 J

3. Components of the applied force in the direction of displacement = 25cos37 = 19.97 N

Work done by the applied force = Components of the applied force in the direction of displacement x Displacement = 19.97 x 15 = 300 J

4. As the applied force and displacement are in opposite directions, work done by the applied force is negative.

Component of the applied force in the direction of displacement ...

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