10. True or False: Enengy is always conserved during a 11 . True or False: Momen

Question

10. True or False: Enengy is always conserved during a 11 . True or False: Momentum is always conserved during 12. True or False: Friction is a conservative force a vehicle impact dent integral. ing work done by a conservative force requires using a pah indepen or False: An object needs to have angular veloscity to have angular momentum 15. A vehicle is traveling along in a straight line on a level road with a speed S. The driver suddenly hits the brakes hard and leaves measureable skid marks of length d, then lets off the brakes and continues traveling at a speed of S,. Assume the drag factor is f which is from the coeflicient of friction. Speeds are in miles per hour Which of the following relarionships is most correct? e) None of the above. 16. What is the fastest a 3500-lb car can travel around a level corner in a circular path with a radius of 100 ft when the friction coefficeint is 0.81? a) 25 mph b) 35 mph c) 45 mph d) 55 mph e) None of the above.

Explanation / Answer

Answer :-

10) True. The total energy is always conserved, but the kinetic energy does not have to be; kinetic energy is often transformed to heat or sound during a impact.

11) True. If two objects (a car and a truck, for example) collide, momentum will always be conserved.

12) False. Friction is NOT a conservative force.

13) True. A Conservative force is a force whose work done is independent of the path taken and depends only on the initial and final position.

14) True. A spinning object has angular momentum and a spinning object must has angular velocity.

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