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Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in Figure?
Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in Figure P5.64. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is µk = 0.30. Determine the change in the kinetic energy of block A as it moves from C to D, a distance of 23 m up the incline if the system starts from rest.
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1 Answer
- AmyLv 79 years agoFavorite Answer
Calculate the vertical distance A rises and the vertical distance B falls.
Calculate the change in gravitational potential energy of each block and of the system.
Calculate the normal force and the force of friction on A.
Calculate the work done by friction.
The kinetic energy gained by the system equals:
Loss of gravitational potential energy - Work done by friction
Because of how they are connected by the string, A and B always have the same speed. That means B (being twice as massive) has twice the kinetic energy of block A.
Block A has 1/3 of the system's KE.
