Two blocks collide on a frictionless surface. After the collision, the blocks stick together. Block A has a mass M and is initially moving to the right at speed v Block B has a mass 2 M and is initially at rest. System C is composed of both blocks. (a) Draw a force diagram for each block at an instant during the collision. (b) Rank the magnitudes of the horizontal forces in your diagram. Explain your reasoning. (c) Calculate the change in momentum of block A, block B, and system C. (d) Is kinetic energy conserved in this collision? Explain your answer. (This problem is courtesy of Edward F. Redish. For more such problems, visit http://www.physics.umd.edu/perg.)

Two frictionless carts collide with each other on a level surface. Cart A has a mass that is several times smaller than the mass of Cart B. Read the following statements about the time during the collision of the carts and select ALL answers that apply. A. Cart A has a larger magnitude acceleration than Cart B during the collision B. Cart A exerts the same amount of force on Cart B that Cart B exerts on Cart A C. Cart A exerts more force on Cart B than Cart B exerts on Cart A D. Cart A has a smaller magnitude acceleration than Cart B during the collision E. Cart A has the same magnitude acceleration as Cart B during the collision

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Block X Block Y 10. Vx M Figure 1. Before the collision Block X Block Y VXY. M Figure 2. After the collision Block X slides along a horizontal surface with a speed Vx toward block Y that is initially at rest, as shown in Figure 1. After block X collides with block Y, the two blocks remain stuck together and travel at a velocity of VXY, as shown in Figure 2. Frictional forces are considered to be negligible. Which of the following claims is correct regarding the momentum of the system containing only block X and the system that contains block X and block Y? A The system containing block X is an open system, and the system of both blocks is an open system. The system containing block X is an open system, and the system of both blocks is a closed system. The system containing block X is a closed system, and the system of both blocks is an open system. D The system containing block X is a closed system, and the system of both blocks is a closed system.