1a F (N) For the next two questions, refer to the below graphs. F(N) 2 1 2 1+ 3 4)t(s) 34 5x (m) -1 11. An object, initially at rest, is acted upon by a single variable force for four seconds and during this time moves five meters. The force is graphed as a function of time (above, left) and as a function of position (above, right). What is the final kinetic energy of the object? A) 1J B) 2 J 6 J D) 7 J 12. What is the final momentum of the object in the previous question? A) 1 kg m/s (B) 2 kg m/s C) 6 kg.m/s D) 7 kg.m/s 13. Two identical metal balls fly directly towards each other at equal speeds, collide, and bounce off one another. Immediately after the collision, the total momentum of the two balls is: A) Less than zero B Zero C) More than zero D) Not enough information in this question. 14. The metal balls in the previous question were observed to rebound away from each other more slowly than they approached, made a loud noise when colliding, and on inspection afterwards were found to be dented in on one side. From these we can conclude that the collision was: A) Conservative B) Elastic C) Totally inelastic Inelastic, but not totally inelastic Page 5 of 9 1. Your lab group is measuring an object moving with constant acceleration. You have collected your data in a position vs. time graph. Using the position vs. time graph, which analysis tool in LoggerPro allows you to most directly find the acceleration of the object? A) Statistics tool (mean, standard deviation) B) Linear fit C) Quadratic fit D) Power fit 2. It is not possible to exert a force on something without also having a force exerted on yourself. This physical fact is most directly described by: A) Newton's First Law of Motion B) Newton's Second Law of Motion C) Newton's Third Law of Motion D) None of the above 3. At a moment in time, an object experiences a non-zero net force. At this moment, what must also be non-zero? A) The object's acceleration B The object's velocity C) The object's position D) Multiple of the above 4. An acrobat stands stationary on a wire as pictured above. All angles in the picture are accurate. How does the tension in the wire compare to the weight of the acrobat? (A)) The wire tension is less than the acrobat weight B) The wire tension is equal to the acrobat weight C) The wire tension is greater than the acrobat weight D) Not enough information to determine 5. A 20 kg block sits on a level surface with a coefficient of kinetic friction k = 0.2. You push on the block with an applied horizontal force of 100 N, and the block slides across the surface. What is the acceleration of the block as it slides? A) 2 m/s B 3 m/s C) 5 m/s D) 7 m/s 20kg UK=0.2 100W Page 3 of 9