CONSERVATION OF MECHANICAL ENERGY

1. COT 1 Material for school Year 2020-2021
In Science 10
BAY-ANG MAGPAG-ONG NATIONAL HIGH SCHOOL
May 25, 2023
9:30- 10:30 AM
MR. FRENZ D. DELA CRUZ
Teacher III

2. SCIENCE 9
PRELIMINARY ACTIVITIES
1. Prayer
2. Chair arrangement
3. Checking of Attendance
4. Review

3. SCIENCE 9
PRELIMINARY ACTIVITIES

4. SCIENCE 9

5. ENGAGE
Guide Card

6. CONSERVATION
OF MECHANICAL
ENERGY

7. OBJECTIVES
1.Define potential energy
and kinetic energy.
2. Perform activities to
demonstrate conservation
of mechanical energy.
(S9FE-IVd-40)
3. Appreciate and identify
daily activities to
demonstrate conservation of
mechanical energy.

8. PRE-TEST
Write TRUE if the statement is correct or FALSE if it is incorrect. Write your answer in the provided answer sheet.
________1. The energy stored in a stretched spring is
called kinetic energy.
________2. The total mechanical energy of a body is the
sum of its potential energy and kinetic energy.
________3. When a basketball and a ping pong ball are
thrown with the same velocity, the kinetic energy of the
basketball is equal to the kinetic energy of the ping pong
ball.
________4. The mechanical energy of a free-falling body
is conserved.
________5. When the object falls the kinetic and
potential energy is the same.
________6. The potential energy of the object at the top is
the lowest.
________7. In conservation of mechanical energy, ME = PE
– KE.
________8. Kinetic energy is stored energy. ________9.
Electrical energy – sound energy is the energy
transformation in a light bulb.
________10. PE = ME – KE, takes place in conservation of
mechanical energy.

9. PRE-TEST
Write TRUE if the statement is correct or FALSE if it is incorrect. Write your answer in the provided answer sheet.
FALSE 1. The energy stored in a stretched spring is called
kinetic energy.
TRUE 2. The total mechanical energy of a body is the
sum of its potential energy and kinetic energy.
FALSE 3. When a basketball and a ping pong ball are
thrown with the same velocity, the kinetic energy of the
basketball is equal to the kinetic energy of the ping pong
ball.
TRUE 4. The mechanical energy of a free-falling body is
conserved.
FALSE 5. When the object falls the kinetic and potential
energy is the same.
FALSE 6. The potential energy of the object at the top is
the lowest.
FALSE 7. In conservation of mechanical energy, ME = PE –
KE.
FALSE 8. Kinetic energy is stored energy.
FALSE 9. Electrical energy – sound energy is the energy
transformation in a light bulb.
TRUE 10. PE = ME – KE, takes place in conservation of
mechanical energy.

10. SCIENCE 9
LESSON
PROPER

11. ACTIVITY 1: CONSTRUCTION OF SIMPLE TURBINE UNIT
Observe the illustrations in Activity Sheet, read the
procedure then conduct the activity and write your
analysis.
DEMONSTRATE
ME!

12. ACTIVITY 2. EFFECT OF THE WATER’S HEAD OF FLOW
ON THE WATER RANGE
Know more
about
MECHANICAL
ENERGY

13. ACTIVITY 2. EFFECT OF THE WATER’S HEAD OF FLOW
ON THE WATER RANGE
Know more
about
MECHANICAL
ENERGY

14. LAW OF MECHANICAL
ENERGY AT A GLANCE
LECTURE
states that the total
mechanical energy in a
system remains constant as
long as the only forces acting
are conservative forces.
This means that potential
energy can become kinetic
energy, or vice versa, but
energy cannot “disappear”. It is
only converted from one form
to another form like potential
energy converted to kinetic or
vice versa.

15. MECHANICAL ENERGY AT A
GLANCE
LECTURE
MECHANICAL
ENERGY is the energy
that is possessed by an
object due to its motion or
due to its position.

16. TWO BASIC FORMS OF MECHANICAL
ENERGY
LECTURE
POTENTIAL ENERGY which
is defined as the energy at rest
associated with height or
position (PE = mgh)

17. TWO BASIC FORMS OF MECHANICAL
ENERGY
LECTURE
KINETIC ENERGY which is
associated with motion (KE=
1/2mv2)

18. TWO BASIC FORMS OF MECHANICAL
ENERGY
LECTURE

19. 3 DIFFERENT TYPES OF
POTENTIAL ENERGY
LECTURE
The energy possess by
an object due to its
position or location. Thus,
the higher the position of
the object, the higher the
GPE.
An object is lifted possess
GPE.
Gravitational
Potential Energy
(GPE)

20. 3 DIFFERENT TYPES OF
POTENTIAL ENERGY
LECTURE
Anything that can
act like a spring or a
rubber band can have
elastic potential energy.
Elastic Potential
Energy (EPE)

21. 3 DIFFERENT TYPES OF
POTENTIAL ENERGY
LECTURE
A chemical bond
can be thought of as an
attractive force between
atoms.
Chemical Potential
Energy (CPE)

22. GENERALIZATION
• How will you define
Mechanical Energy?
• What does the law of
conservation of mechanical
energy states?
• What are the basic forms of
Mechanical Energy?
• How will you differentiate
Potential Energy to Kinetic
Energy?
• What is the difference
between the 3 types of
potential energy?

23. SCIENCE 9
EVALUATION

24. EVALUATION
DIRECTION: Read each item carefully. Encircle the letter of the correct
answer.

25. EVALUATION
DIRECTION: Read each item carefully. Encircle the letter of the correct
answer.

26. EVALUATION
DIRECTION: Read each item carefully. Encircle the letter of the correct
answer.

27. SCIENCE 9

28. ENRICHMENTACTIVITY
VIDEO PRESENTATION / ILLUSTRATION OF
POTENTIAL AND KINETIC ENERGY
DIRECTION: Choose only one (1) between
the two activities below.
1. Present a video of activities at home
showing conservation of mechanical
energy is manifested. The length of the
video recorded should be 1 minute at
most.
2. Illustrate a situation that demonstrates
conservation of mechanical energy. You
may create a vlog/tiktok video for you to
illustrate the conservation of mechanical
energy.

29. 17-20
13-16
9-12
5-8
4 & below