2. Energy- derived from the Greek word
“energia, en, and ergon, meaning “work.”
Anything that is able to do work is said to
possess energy.
- is the ability to do work.
SUN- is the ultimate source of all.
3.
4. Given:
KE - ?
m- 100 kg
v – 6 m/s
Formula:
Solution:
= 1 (100 kg) (6m/s)
2
= 1 (100 kg) (36m / s )
2
= 3,600 kg m / s
2
KE = 1, 800 Joules
2
2
2
2
7. 1. A mass of 5Kg is taken from the ground to the height
of 100m. Find the potential energy of the object.
8. 2. A mass of 2Kg is taken from the ground to the height of
10m. Find the potential energy of the object.
9. Formula in finding
the height.
Formula in finding
the mass.
What is the height of the water bottle
with a mass of 2.5 kg and PE 125 J.
Find the mass of bag ,with a potential
energy 160 J and the height of 4 m
when lifted up.
mass- 4.08
height – 5.10
10. Solve the following. Show your solution in
each number.
Problem 1
What is the potential energy of a 6kg box when it is lifted 2.5 m from a
floor?
Formula:
Given:
Solution:
11. Solve the following. Show your solution in
each number.
Problem 2
Find the kinetic energy of soccer ball with a mass of 0.43 kg with a
velocity of 25 m/s.
Formula:
Given:
Solution:
12. Solve the following. Show your solution in each number.
Problem 3
A 27 kg cheetah charges at a speed of 31.1 m/s. What is the cheetah’s
kinetic energy?
Formula:
Given:
Solution:
13. Solve the following. Show your solution in each number.
Problem 4
What is the potential energy of a rock that weighs 155 kg that is sitting
on the top a hill 250 meters high?
Formula:
Given:
Solution:
17. ELECTRICAL ENERGY
It is the result of the
movement of an electrical
charge, and is commonly
known to as” electricity”.
ELECTRIC CURRENT- IS
THE FLOW OF
ELECTRONS THROUGH
MATTER.
It is the energy carried by electricity.
18. RADIANT
ENERGY
Is energy that travels
towards all directions
from the source.
Radiation- is a form of
energy that can move
through empty space. Light is part of radiant
energy.
19. • Wavelengths are measured by scientist in units called angstrom(A )
1 Angstrom- 4 billionth inch.
Infrared waves- William
Herschel
Radio waves- Elihu Thompson
20. Ultraviolet rays are rays beyond the violet
wavelength of light . Ultra is a Latin word which
means “beyond”.
21. X- Rays- are produced when the electrons hit
any atoms at high speed.
- Physical examination, ultrasound analysis.
- Used to sense remote ares, monitor
animals migrations and pollution of
waterways.
William Crookes William Conrad Roentgen
22.
23. Nuclear Energy- is the
energy in the nucleus, or
core, of an atom.
Atoms- tiny units that
make up all matter in the
universe
25. Uses of Sound Waves
1. To detect the position of
submarines.
2. To study certain disease and
injuries.
3. Used for cleaning.
4. To determine the oceans depths:
study seabed's; and detect fish,
wrecks, and submarines.
26. Light is a form of energy that
is visible. The Sun is the main
source of light on Earth
