Problem_of_the_Week_–_9

Problem_of_the_Week_–_9 - (b) In the...

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Problem of the Week – 9 An automobile of mass 1500 kg accelerates from rest to 20 m/s in 5 seconds. Neglect air resistance. Assume the wheels do not slip on the pavement, which means that the velocity of atoms when they are in contact with the road (at the bottom of the wheel) is always zero. (This is similar to the case of walking or running without slipping; there’s no displacement at the point of contact.) (a) What is the average horizontal component of the force that the road exerts on the wheels (total force on all four wheels, not the force on one wheel)?
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Unformatted text preview: (b) In the point-particle analysis of this situation, what is the work done by this force? (c) How far does the automobile travel in the 5 seconds? (d) For the real system, how much work is done by the force of the road on the wheels? (e) For the real system, label which of the following types of energy increase or decrease over the 5 second period: translational kinetic energy, rotational kinetic energy, thermal energy, chemical energy. (f) For any of the energies that you identified in (e) as decreasing, what is the minimum magnitude it can have decreased by?...
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