A process is described mathematically:

1. A process is described mathematically: 1. 3. 4M 4M 4M 4M 4M 4M M M M M M M 2. Which picture matches the mathematical description best? Construct a picture that matches the mathematical description.

2. Pix + Ix = Pfx A process is described with the momentum bar chart shown below. • Alan is riding a bike and hits a haystack, bringing him and his bike to a stop. • Alan is riding his bike and hits a patch of ice where he slides until he regains control and continues riding at a slower speed. • Alan gets hit by a tree branch and falls on the ground watching his bike ride off in the distance. Construct a verbal description that matches the bar chart shown above. Which verbal description matches the bar chart shown above?

3. A small person is walking across a massive freely floating log in the water. Which picture represents this process? A small person is walking across a massive freely floating log in the water. Construct a picture showing the relative speed and directions of the log and the person. 1 3 2 4

4. A pendulum is seen swinging. It hits a piece of clay at the bottom. Which verbal description best matches the pictorial description? A pendulum is seen swinging. It hits a piece of clay at the bottom. Use energy and/or momentum ideas to decide how high the pendulum rises after the collision. y yo • According to the conservation of energy, the increased mass implies increased energy. y > yo. • Since energy is conserved, mass is not important. y = yo. • Momentum must be conserved when the pendulum hits the clay, giving a smaller velocity, so y < yo. • There is no accurate way to determine how y and yo compare.

5. An object of mass 2 kg has a linear momentum of magnitude 6 kg*m/s. What is this object’s kinetic energy? • 3 J • 6 J • 9 J • 12 J • 18 J 1. 2. 3. 4. 5.

6. A ball of mass 0.5 kg, initially at rest, acquires a speed of 4 m/s immediately after being kicked by a force of strength 20 N. For how long did this force act on the ball? • 0.01 sec • 0.02 sec • 0.1 sec • 0.2 sec • 1 sec 1. 2. 3. 4. 5.

7. A box with a mass of 2 kg accelerates in a straight line from 4 m/s to 8 m/s due to the application of a force whose duration is 0.5 sec. Find the average strength of this force • 2 N • 4 N • 8 N • 12 N • 16 N 1. 2. 3. 4. 5.

8. A ball of mass m traveling horizontally with velocity v strikes a massive vertical wall and rebounds back along its original direction with no change in speed. What is the magnitude of the impulse delivered by the wall to the ball? • 0 • ½ mv • mv • 2mv • 4mv 1. 2. 3. 4. 5.

9. Two objects, one of mass 3 kg and moving with a speed of 2 m/s and the other of mass 5 kg and speed 2 m/s, move toward each other and collide head-on. If the collision is perfectly inelastic, find the speed of the objects after the collision. • 0.25 m/s • 0.5 m/s • 0.75 m/s • 1 m/s • 2 m/s 1. 2. 3. 4. 5.

10. Two objects move toward each other, collide, and separate. If there was no net external force acting on the objects, but some kinetic energy was lost, then • The collision was elastic and total linear momentum was conserved. • The collision was elastic and total linear momentum was not conserved. • The collision was not elastic and total linear momentum was conserved. • The collision was not elastic and total linear momentum was not conserved. • None of the above. 1. 2. 3. 4. 5.

11. A rubber ball (mass = 0.08 kg) is dropped from a height of 2 m, and after bouncing off the floor, rises almost to its original height. If the impact time with the floor is measured to be 0.04 sec, what average force did the floor exert on the ball? • 0.16 N • 16 N • 25 N • 36 N • 64 N 1. 2. 3. 4. 5.

12. Which of the following best describes a perfectly inelastic collision free of external forces? • Total linear momentum is never conserved. • Total linear momentum is sometimes conserved. • Kinetic energy is never conserved. • Kinetic energy is sometimes conserved. • Kinetic energy is always conserved. 1. 2. 3. 4. 5.