Transcript File - Ms. D. Science CGPA

Energy and Motion
Table of Contents
8.2
Conservation of Energy
Ch. 8.2
Vocabulary
Mechanical Energy: Kinetic or potential energy associated with
the motion or position of an object.
Energy Transformation: A change from one form of energy to
another; also called an energy conversion.
Law of Conservation of Energy: The rule that energy cannot be
created or destroyed.
Thermal Energy: The total kinetic and potential energy of all the
particles of an object.
Energy Transformation Interactive Activity
Interactive Art Pearson
How Can You Find an Object’s Mechanical Energy? Pg. 296
What do a falling basketball, a moving car, and a trophy on
a shelf have in common?
They ALL have mechanical energy!!
What is MECHANICAL ENERGY??
Is the form of energy related with the motion, position, or shape
of an object.
Energy related with motion+ position+ shape= Mechanical energy
Calculating Mechanical Energy pg. 297
• An object’s mechanical energy is a combination of its potential energy
and its kinetic energy.
How do you find an object’s mechanical energy ??
You can find an object’s mechanical energy by adding the object’s
kinetic energy and potential energy.
(Mechanical Energy=Potential Energy + Kinetic Energy)
ME= PE+ KE
PE= 15 J
KE= + 6 J
ME=
An object with mechanical energy can do work on another object. The
more mechanical energy an object has, the more work it can do.
Energy Transformations
pg. 298
Energy Transformation: A change from one form of energy to
another.
One of the most common changes of energy is the one between
P__________ and K___________ e__________.
r. 298 (all)
Transformations between kinetic and potential energy can also
occur in any object that rises or falls.
Energy Transformation Interactive Activity
Interactive Art Pearson
Apply It!!
What is The Law of Conservation of Energy?
Pg. 300
The law of conservation of energy states that when one form of
energy is transformed to another, no energy is lost in the
process. According to the law of conservation of energy,
energy cannot be created or destroyed. The total amount of
energy is the same before and after any transformation.
Conservation of Energy pg. 298
Figure 3
Pendulum
A continuous transformation
between potential and
kinetic energy occurs in a
pendulum.
Label the type of the
pendulum has at
positions A, B, and C?
What is The Law of Conservation of Energy?
Pg. 300
Whenever a moving object experiences friction, some of its kinetic
energy is transformed into thermal energy. Thermal energy is the
total kinetic and potential energy of the particles in an object. It is
also sometimes known as heat energy, because when the
particles in an object move rapidly, you can feel it as heat.
Conservation of Energy Figure 4 pg. 300/1
Conserving Energy While You Ride
Transformations between potential and kinetic energy occur during a
roller coaster ride. How much potential and kinetic energy does the
coaster have at each point?