AP Physics Chapter 9 QUIZ

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1 AP Physics Chapter 9 QUIZ Name:. The graph at the right shows the force on an object of mass M as a function of time. For the time interal 0 to 4 seconds, the total change in the momentum of the object is: 40 kg m/s (B) 0 kg m/s (C) 0 kg m/s 0 kg m/s (E) indeterminable unless the mass M of the object is known Force (N) Time (s). As shown in the top iew at the right, a disc of mass m is moing horizontally to the right with speed on a table with negligible friction. It collides with a second disc of mass m which is moing horizontally to the right with speed /. The two discs stick together upon impact and continue to moe to the right. The speed of the composite body immediately after the collision is: /3 (B) / (C) /3 3/ (E) / m m Top View 3. Two people are initially standing still on frictionless ice. They push on each other so that one person, of mass 0 kg, moes to the left at m/s, while the other person, of mass 80 kg, moes to the right at 3 m/s. What is the elocity of their center of mass? Zero (B) 0.5 m/s to the left (C) m/s to the right.4 m/s to the left (E).5 m/s to the right

2 AP Physics Chapter 9 Quiz Page 4. An object haing an initial momentum that may be represented by the ector at the right strikes an object that is initially at rest. Which of the following sets of ectors may represent the momenta of the two objects after the collision? (B) (C) (E) 5. A ball initially moes horizontally with elocity i, as shown at the right. It is then struck by a stick. After leaing the stick, the ball moes ertically with a elocity f, which is smaller in magnitude than i. Which of the following ectors best represents the direction of the aerage force that the stick exerts on the ball? f i (B) (C) (E)

3 AP Physics Chapter 9 Quiz Page 3 6. Two balls of equal mass are on a frictionless horizontal tabletop. Ball X initially moes at 0 meters per second, as shown in Figure I at the right. It then collides elastically with identical ball Y, which is initially at rest. After the collision, ball X moes at 6 meters X per second along a path at 53. to its original 6 m/s X direction, as shown in Figure II at the right. Which 0 m/s 53. of the following diagrams best represents the Figure I Y Figure II motion of ball Y after the collision? = 0 (B) = 0 m/s (C) m/s 36.9 (E) m/s 8 m/s 7. A balloon of mass M is floating motionless in the air. A person of mass less than M is on a rope ladder hanging from the balloon. The person begins to climb the ladder at a uniform speed relatie to the ground. How does the balloon moe relatie to the ground? Up with speed (B) Up with a speed less than (C) Down with speed Down with a speed less than (E) The balloon does not moe 8. If one knows only the constant resultant force acting on an object and the time during which this force acts, one can determine the: change in momentum of the object (B) change in elocity of the object (C) change in kinetic energy of the object mass of the object (E) acceleration of the object

4 AP Physics Chapter 9 Quiz Page 4 9. An object of mass m is moing with speed to the right on a horizontal frictionless surface, as shown at the right, when it explodes into two pieces. Subsequently, one piece of mass /5 m moes with a speed / to the left. The speed of the other piece of the object is: / (B) /3 (C) 7 /5 3 / (E) m 0. A 5-kilogram sphere is connected to a 0-kilogram sphere by a rigid rod of negligible mass, as shown aboe. Which of the fie lettered points represents the center of mass of the sphere-rod combination? A (B) B (C) C D (E) E A E B C D 0 kg 5 kg # & A 4-kilogram mass has a speed of 6 meters per second on a horizontal frictionless surface, as shown aboe. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and sticks to a third 4-kilogram mass initially at rest.. The final speed of the first 4-kilogram mass is: 0 m/s (B) m/s (C) 3 m/s 4 m/s (E) 6 m/s 6 m/s 4 kg 4 kg 4 kg. The final speed of the two 4-kilogram masses that stick together is: 0 m/s (B) m/s (C) 3 m/s 4 m/s (E) 6 m/s

5 AP Physics Chapter 9 Quiz Page 5 3. A piece of wire of uniform cross section is bent in the shape shown aboe. What are the coordinates ( x, y) of the center of mass? (5/4, 6/7) (B) (6/7, 6/7) (C) (5/4, 8/7) (,) (E) (,6/7) y O x 4. Two particles of equal mass m 0, moing with equal speeds along paths inclined at 60 to the x-axis as shown at the right, collide and stick together. Their elocity after the collision has magnitude: m 0 y 4 60 (B) (C) 3 m 0 60 x o 5. The center of mass of a uniform wire, bent in the shape shown at the right, is located closest to point: A (B) B (C) C D (E) E L / L / 4 L / 4 A B C D E L L

6 AP Physics Chapter 9 Quiz Page 6 6. Mass M is moing with speed toward stationary mass M. The speed of the center of mass of the system is: M M M (B) M M (C) M M M M M (E) M M M M 7. As shown in the figure, a child of mass 0 kg who is running at a speed of 4.0 m/s jumps onto a stationary sled of mass 5.0 kg on a frozen lake. The speed at which the child and sled begin to slide across the ice is most nearly 0.0 m/s (B) 0.80 m/s (C). m/s 3. m/s (E) 6 m/s 8. A toy spacecraft is launched directly upward. When the toy reaches the highest point, a spring is released and the toy splits into two parts with masses 0.0 kg and 0.08 kg respectiely. Immediately after the separation, the 0.0 kg part moes horizontally due east. Air resistance is negligible. True statements about the 0.80 kg part include which of the following? I. It could moe north immediately after the spring is released. II. It takes longer to reach the ground than does the 0.0 kg part. III. It strikes the ground farther from the launch point than does the 0.0 kg par. None (B) I only (C) III only I and II only (E) II and III only

7 AP Physics Chapter 9 Quiz Page 7 9. The graph at the right shoes the force acting on an object as a function of time. The change in momentum of the object from time 0 to t is Ft (B) Ft (C) ½ Ft ¼ Ft (E) Zero Force F t/ t Time 0. A projectile of mass M is fired horizontally from a spring gun that is initially at rest on a frictionless surface. The combined mass of the gun and projectile is M. If the kinetic energy of the projectile after firing is K, the gun will recoil with a kinetic energy equal to M M M K (B) M M M K (C) K D) M M K (E) M M K

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