Time (y) 15
1-
15 During a lab investigation, students added four 50 g masses to two boxes and arranged
the boxes so that they were motionless on a pulley, as shown in the diagram. The
students then followed the procedure described in the box. The students recorded their
observations after each procedure and reset the pulley system to the original conditions.
During which procedures did students observe an unbalanced upward force on Box 1?
1
Choose only one.
Procedures
A. Procedures only
B. Procedures 1, 2, and 3
50 g
mass
1. Push Box 1 downward. Observe. Reset.
2. Add another mass to Box 1. Observe. Reset.
3. Remove one mass from Box 2. Observe. Reset.
4. Add another-mass to Box 2. Observe. Reset.
5. Remove two masses from Box 1. Observe. Reset.
C. Procedures 4 and 5
Box 1
D. Procedures 3 and 4
E. Procedures 1, 3, and 5
Box 2