UA UB Problem 5.78 A Ford Excursion A, with a mass ma = 3900 kg and traveling with a speed v4 = 25 km/h, collides head-on with a Mini Cooper B, with a mass mB = 1200 kg, traveling in the opposite direction with a speed vB = 15 km/h. Model the impact of A and B as an unconstrained direct central impact of particles and determine the time needed for each car to stop if the cars slide after impact with uk = 0.8 and if the impact's COR is Figure P5.78 e = 0.1.

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Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.