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2. Two gliders are on a frictionless, level air track. Initially, glider A moves toward the right and glider B is at rest. After the collision, glider A has reversed direction and moves toward the left. The combined system of both gliders is denoted as system C. Initial direction of motion A B m_A = 1/4 m_B Track is frictionless The mass of glider A is one fourth the mass of glider B. a. Draw an arrow to represent the direction of the initial velocity (before the collision) of the center of mass of system C. If the initial velocity of the center of mass is zero, state that explicitly. Explain. Direction of v_cm, i b. Draw an arrow for each glider to represent the direction of the change in velocity from before to after the collision. Explain how you determined your answer. Direction of change in velocity Glider A Glider B Is the magnitude of the change in velocity vector for glider A greater than, less than, or equal to the magnitude of the change in velocity vector for glider B? Explain. c. Draw an arrow to represent the direction of the final velocity (after the collision) of the center of mass of system C. Explain how you determined your answer. Direction of v_cm, f d. Consider the following incorrect statement: "Glider B will move to the right after this collision, but it would move faster if glider A were to come to a stop, giving glider B all its momentum." Describe what is incorrect about this statement and explain how you can tell.

          2. Two gliders are on a frictionless, level air track. Initially, glider A moves toward the right and glider B is at rest. After the collision, glider A has reversed direction and moves toward the left. The combined system of both gliders is denoted as system C.

Initial direction of motion
A B
m_A = 1/4 m_B Track is frictionless

The mass of glider A is one fourth the mass of glider B.

a. Draw an arrow to represent the direction of the initial velocity (before the collision) of the center of mass of system C. If the initial velocity of the center of mass is zero, state that explicitly. Explain.
Direction of v_cm, i

b. Draw an arrow for each glider to represent the direction of the change in velocity from before to after the collision. Explain how you determined your answer.
Direction of change in velocity
Glider A Glider B

Is the magnitude of the change in velocity vector for glider A greater than, less than, or equal to the magnitude of the change in velocity vector for glider B? Explain.

c. Draw an arrow to represent the direction of the final velocity (after the collision) of the center of mass of system C. Explain how you determined your answer.
Direction of v_cm, f

d. Consider the following incorrect statement:

"Glider B will move to the right after this collision, but it would move faster if glider A were to come to a stop, giving glider B all its momentum."

Describe what is incorrect about this statement and explain how you can tell.

2. Two gliders are on a frictionless, level air track. Initially, glider A moves toward the right and glider B is at rest. After the collision, glider A has reversed direction and moves toward the left. The combined system of both gliders is denoted as system C.

Initial direction of motion
A B
mA = 1/4 mB Track is frictionless

The mass of glider A is one fourth the mass of glider B.

a. Draw an arrow to represent the direction of the initial velocity (before the collision) of the center of mass of system C. If the initial velocity of the center of mass is zero, state that explicitly. Explain.
Direction of vcm, i

b. Draw an arrow for each glider to represent the direction of the change in velocity from before to after the collision. Explain how you determined your answer.
Direction of change in velocity
Glider A Glider B

Is the magnitude of the change in velocity vector for glider A greater than, less than, or equal to the magnitude of the change in velocity vector for glider B? Explain.

c. Draw an arrow to represent the direction of the final velocity (after the collision) of the center of mass of system C. Explain how you determined your answer.
Direction of vcm, f

d. Consider the following incorrect statement:

"Glider B will move to the right after this collision, but it would move faster if glider A were to come to a stop, giving glider B all its momentum."

Describe what is incorrect about this statement and explain how you can tell.

Added by Monica C.

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