EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
PHYSICS FINALS
(WEEK 1)
• Work
• Kinetic Energy
• Work-Kinetic Energy Theorem
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
You’d probably agree that it’s hard work to
WORK
pull a heavy sofa across the room, to lift a stack of
encyclopedias from the floor to a high shelf, or to push
a stalled car off the road. Indeed, all of these
examples agree with the everyday meaning of work—
any activity that requires muscular or mental effort.
In physics, work has a much more precise
definition. By making use of this definition we’ll find
that in any motion, no matter how complicated, the
total work done on a particle by all forces that act on it
equals the change in its kinetic energy—a quantity
that’s related to the particle’s speed.
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
WORK DONE BY A CONSTANT FORCE
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
WORK CAN BE POSITIVE, NEGATIVE, OR ZERO
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
WORK DONE BY VARYING FORCE
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
WORK DONE BY SPRING FORCE
1
𝑊 = 𝑘∆𝑥 2
2
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
ENERGY
• Is the capacity of a physical system to perform work. Energy exists in
different forms such as heat, mechanical, light, electrical, solar, etc.
MECHANICAL ENERGY
• Mechanical energy (kinetic energy or potential energy) is the energy of
either an object in motion or the energy that is stored in objects by
their position. Mechanical energy is also a driver of renewable energy.
Many forms of renewable energy rely on mechanical energy to
adequately produce power or convert energy.
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
KINETIC ENERGY
•
Is a form of energy that an object or a
particle has by reason of its motion.
If work, which transfers energy,
is done on an object by applying a
net force, the object speeds up and
thereby gains kinetic energy. Kinetic
energy is a property of a moving object
or particle and depends not only on its
motion but also on its mass.
VIRTUE
EXCELLENCE
SERVICE
EMILIO AGUINALDO
City of Dasmariñas,Cavite
COLLEGE
ISO 9001: 2015 CERTIFIED
QUALITY MANAGEMENT SYSTEM
WORK-KINETIC ENERGY THEOREM
The work-energy theorem states that the net work done by the forces on an
object equals the change in its kinetic/ energy.
VIRTUE
EXCELLENCE
SERVICE