The document discusses potential and kinetic energy. It defines potential energy as stored energy due to position or deformation, including elastic potential energy from compression or stretching. Potential energy depends on mass and height according to the gravitational potential energy formula. Kinetic energy is the energy of motion. Examples calculate potential energy using the formula and find the height corresponding to a given potential energy.

1. G R A D E 8 -
S U B I C
M a ’ a m J o y c e A n n D . P e r e z

2. W E E K 3 : FA C T O R S A F F E C T I N G
P O T E N T I A L A N D K I N E T I C E N E R G Y

3. W E E K 3 : FA C T O R S A F F E C T I N G
P O T E N T I A L A N D K I N E T I C E N E R G Y
Which picture of the child shows
potential energy? Which of them
showed kinetic energy?

5. E N E R G Y
is defined as the ability to do work.
Everything happens in the world uses energy

9. P O T E N T I A L E N E R G Y
Potential energy is present when the work is waiting to be
done, or when there is the potential for work to be performed.

11. E L A S T I C P O T E N T I A L E N E R G Y
is energy stored as a result of
applying a force to deform an
elastic object. The energy is
stored until the force is removed
and the object springs back to its
original shape, doing work in the
process. The deformation could
involve compressing, stretching
or twisting the object.

12. P O T E N T I A L E N E R G Y
It is affected by the mass of the objects and gravitational force. The
acceleration due to gravity is 9.8 m/s2 or rounded off as 10 m/s2.
The two objects that are in the same position have potential
energy, yet an object with greater mass has greater potential
energy, with respect to it position.
Formula of GPE= mgh Where:
m= mass (kg)
g= gravitational
acceleration (kgm/s2)
Unit= Joules (J) or (Nm)
Formula of h=
𝑷𝑬
𝒎𝒈

13. E X A M P L E :
There is a bell at the top of a tower that is 50 m high. The bell
weighs 190N
Using GRESA Method , solve the problem
PE= mgh (m*g= N)
N= kg m/s2
Given:
Force= 190N
Height= 50m
Required: PE (Potential Energy
Equation: PE= mgh
Solution = 190N* 50m
Answer= 9500 Joules

14. E X A M P L E :
At what height is an object that has a mass of 48 kg if its
gravitational potential energy is 12,336 J?
Using GRESA Method , solve the problem
PE= mgh (m*g= N)
N= kg m/s2
Answer : 256m

15. K I N E T I C E N E R G Y
The word “kinetic” in English comes from the Greek word
kinetikos (moving).