Exam 2 - Spring 2006

# Exam 2 - Spring 2006 - Please sit in seat number: _ PH2100...

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PH2100 Exam 2 Spring 2006 Page 2
PH2100 Exam 2 Spring 2006 Page 1 1. A fisherman catches a fish with a new fishing pole. As he reels it in, the fish is suspended on the end of the fishing line, and is moving upward and slowing down. Which free body diagram is correct for the fish? You may ignore air drag. 2. An object cannot remain at rest unless: (A) there are no forces acting on the object at all. (B) there is only one force acting on the object. (C) the net force acting on the object is a nonzero constant vector. (D) the net force acting on the object is zero. (E) air drag cannot be ignored. 3. A champion skier jumps off of a ski jump. The corresponding motion diagram is shown at the right. At the highest point of the motion (circled), we can conclude that: (A) the net force is non-zero and the velocity is non-zero. (B) the net force is non-zero and the velocity is zero. (C) the net force is zero and the velocity is zero. (D) the net force is zero and the velocity is non-zero (E) We cannot conclude anything about the net force and the velocity of the skier from the motion diagram. 4. True or false: An object's acceleration vector always points

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## Exam 2 - Spring 2006 - Please sit in seat number: _ PH2100...

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