Title: Kinetic energy is the energy of motion. An object which has motion - whether it be vertical or horizontal motion - has kinetic energy. There are many forms of kinetic energy - vibrational (the energy due to vibrational motion), rotational (the energy due
1 Kinetic energy is the energy of motion. An
object which has motion - whether it be vertical
or horizontal motion - has kinetic energy. There
are many forms of kinetic energy - vibrational
(the energy due to vibrational motion),
rotational (the energy due to rotational motion),
and translational (the energy due to motion from
one location to another).
2- To keep matters simple, we will focus upon
translational kinetic energy. The amount of
translational kinetic energy (from here on, the
phrase kinetic energy will refer to translational
kinetic energy) which an object has depends upon
two variables the mass (m) of the object and the
speed (v) of the object. The following equation
is used to represent the kinetic energy (KE) of
an object.
3where m mass of objectv speed of object
This equation reveals that the kinetic energy of
an object is directly proportional to the square
of its speed. That means that for a twofold
increase in speed, the kinetic energy will
increase by a factor of four.
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8Thermal energy is the total potential energy
and kinetic energy of an objects
particle.Convection is heat transfer movement
of matter. When water is heated on a stove, for
example, water near the bottom of the of the pot
rises by convection.
9- Conduction is the heat transfer by movement of
particles. - Example A metal spoon in a bowl of hot soup is
warmed by conduction of heat from particle to
particle along the length of the spoon. - Radiation is the heat transfer by
electromagnetic waves. Unlike convection and
conduction, radiation can move through empty
space as well as through matter. - Example energy from the sun travels by radiation
through space.
10- The temperature of the substance increaess as it
absorbs heat. Specific heat is the amount of heat
needed to raise the temperature of one kilogram
of a substance by 10C. - Land near a lake or ocean, for example, changes
temperature faster than water that is nearby
because water has a higher specific heat than
land.
11ENERGY TYPE DESCRIPTION EXAMPLES
ELECTRICAL ENERGY OF MOVING ELECTRONS ENERGY IN HOUSEHOLD WIRING LIGHTNING
SOUND KINETIC ENERGY CAUSED BY VIBRATIONS VIBRATION OF AIR PARTICLES VIBRATION OF AN OBJECT
ELASTIC POTENTIAL ENERGY STORED IN ELASTIC MATERIAL A STRETCHED RUBBER BAND A STRETCHED OR COMPRESSED SPRING
CHEMICAL POTENTIAL ENERGY STORED IN CHEMICAL BONDS ENERGY STORED IN FOOD ENERGY STORED IN FOSSIL FUELS ENERGY STORED IN A BATTERY
GRAVITATIONAL POTENTIAL ENERGY DUE TO HEIGHT ABOVE A SURFACE A ROCK SITTING ON A CLIFF A BALL LIFTED ABOVE THE GROUND
NUCLEAR ENERGY THAT HOLDS THE NUCLEUS OF AN ATOM TOGETHER FISSION IN A NUCLEAR REACTOR RADIOACTIVE DECAY FUSION REACTIONS IN STAR
12- Radiant Energy energy coming from the sun.
- Mechanical Energy energy of moving objects.
13ENERGY CHANGES Energy often changes from one
form to another. A rock on a cliff has only
gravitational potential energy, but if the rock
falls, the energy changes to kinetic energy. A
light bulb changes electrical energy to thermal
energy and light. Chemical energy in gasoline
changes to kinetic energy as a car moves.
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