Answered

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)
Encircle the letter of the best answer.
1. Which of the following is true of the conservation of energy in a closed system?
A. Kinetic energy is always conserved.
B. Potential energy is always conserved.
C. Mechanical energy is always conserved.
D. Total energy is always not conserved.
2. The mechanical energy of a system of objects is
A. the sum of kinetic energy and gravitational potential energy.
B. the sum of kinetic energy and elastic potential energy.
C. the sum of kinetic energy and all relevant forms of potential energy.
D. the sum of all forms of energy.
3. Mechanical energy is not conserved when
A. gravitational potential energy is converted to kinetic energy.
B. kinetic energy is converted to gravitational potential energy.
C. kinetic energy is converted to elastic potential energy.
D. friction is not negligible.
4.Which event illustrates the direct transformation of potential to kinetic energy?
A. A basketball player catches a flying ball.
B. A kalesa moves from rest.
C. Kathy's arrow is released from its bow.
D. The spring mechanism of a toy is rotated until it locked.
5. If mechanical energy is conserved in a system, the energy at any point in time can be in the form of
A. kinetic energy.
B. gravitational potential energy
C. elastic potential energy
D. all of the above
VI. REFLECTION (Time Frame: Day 5)
D
Communicate your personal assessment as indicated in the Learner's Assessment Card.
Personal Assessment on Learner's Level of Performance
Using the symbols below, choose one which best describes your experience in working on each given task. Draw it in the column
for Level of Performance (LP). Be guided by the descriptions below:
-I was able to do/perform the task without any difficulty. The task helped me in understanding the target content/ lesson.
-I was able to do/perform the task. It was quite challenging, but it still helped me in understanding the target content/lesson.
-I was not able to do/perform the task. It was extremely difficult. I need additional enrichment activities to be able to do/perform this
task.
Learning Task
Number 1
Number 2
LP
Learning Task
Number 3
Number 4
LP
Learning Task
Number 5
Number 6
LP
Learning Task
Number 7
Number 8
LP
VII. REFERENCES
1.Grade 9 Learners Material in Science, pp. 326-348
2. Aquino, Marites D., Abistado, Jonna M. and Forteza, Rex S. Worktext in Science and
Technology Science Links-Physics, Rex Bookstore Inc., 2012, pp.71-73.
3. Padua, Alicia and Crisostome, Ricardo, Practical and Explorational Physics Modular
Approach, Lilia M. Rabago, Ph. D. Vibal Publishing House, 2003, pp. 138-140.
4. Sabalburo, Lucita, et.al., Science and Life Series Physics, Ernesto Guillermo Jr., Sunshine
Interlinks Publishing House,Inc. 2009. pp. 240-243.
Prepared by:
Mary Jean B. Barrera
PIVOT
Checked by:
EDNA B. GABRIEL
RIZALITO A. LICOS
MARY ANN L. CASTRO
ROSZIEL S. ROSALES



Answer :

GinnyAnswer
1. The correct answer is C. Mechanical energy is always conserved in a closed system, not just kinetic or potential energy alone. This means that the total mechanical energy (kinetic energy + potential energy) remains constant in the absence of external forces like friction. 2. The correct answer is C. The mechanical energy of a system is the sum of kinetic energy and all relevant forms of potential energy. This includes gravitational potential energy and any other potential energy associated with the system. 3. The correct answer is D. Mechanical energy is not conserved when friction is not negligible. Friction can convert mechanical energy into other forms like heat, reducing the total mechanical energy of the system. 4. The correct answer is C. When Kathy's arrow is released from its bow, it directly transforms potential energy (elastic potential energy stored in the bow) into kinetic energy as the arrow moves. 5. The correct answer is D. If mechanical energy is conserved in a system, the energy at any point in time can be in the form of kinetic energy, gravitational potential energy, or elastic potential energy. This means all of these forms can exist simultaneously while the total mechanical energy remains constant.

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