IV. LEARNING PHASES AND LEARNING ACTIVITIES

V. ASSESSMENT (Time Frame: Day 5)
(Learning Activity Sheets for Enrichment, Remediation, or Assessment to be given on Weeks 3 and 6)
Choose the letter of the correct answer.

1. Which is a necessary condition for the total momentum of a system to be conserved?
A. Kinetic energy must not change.
B. No external force is present.
C. An object must be at rest.
D. Only the force of gravity acts on the system.

*For numbers 2 and 3: Two 0.5 kg balls approach each other with the same speed of 1.0 m/s.

2. What is the total momentum of the system before collision?
A. 0
B. 0.50 kg m/s
C. 1.0 kg m/s
D. -1.0 kg m/s

3. If there is no external force acting on the system, what is the total momentum of the system after collision?
A. 0
B. 0.50 kg m/s
C. 1.0 kg m/s
D. -1.0 kg m/s

4. Two billiard balls approach each other at equal speed. If they collide in a perfectly elastic collision, what would be theirvelocities after collision?
A. zero
B. same in magnitude and direction
C. same in magnitude but opposite in direction
D. different in magnitude and opposite in direction

5. A 50-kg astronaut ejects 100 g of gas from his propulsion pistol at a velocity of 50 m/s. What is his resulting velocity?
A. -0.10 m/s
B. -0.50 m/s
C. 0 m/s
D. -100 m/s​