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Topic: Kinetic energy

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  Kinetic energy - Wikipedia, the free encyclopedia
Kinetic energy (SI unit: the Joule) is energy that a body possesses as a result of its motion.
In another frame of reference the additional kinetic energy is that corresponding to the total mass and the speed of the center of mass.
Relativity theory states that the kinetic energy of an object grows towards infinity as its speed approaches the speed of light, and thus that it is impossible to accelerate an object to this boundary.
en.wikipedia.org /wiki/Kinetic_energy   (1137 words)

 kinetic energy - Hutchinson encyclopedia article about kinetic energy   (Site not responding. Last check: 2007-10-22)
This energy is equal to the work that would have to be done in bringing the body to rest, and is dependent on both the body's mass and speed.
All atoms and molecules possess some amount of kinetic energy because they are all in some state of motion (see kinetic theory).
Adding heat energy to a substance increases the mean kinetic energy and hence the mean speed of its constituent molecules – a change that is reflected as a rise in the temperature of that substance.
encyclopedia.farlex.com /Kinetic+energy   (241 words)

 The Physics Classroom
This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed.
The kinetic energy is dependent upon the square of the speed.
Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of 20.0 m/s.
www.physicsclassroom.com /Class/energy/u5l1c.html   (509 words)

 Kinetic energy penetrator - Wikipedia, the free encyclopedia
A kinetic energy penetrator is a type of ammunition which, like a bullet, does not contain explosives, but uses kinetic energy to penetrate the target.
The most common modern type of kinetic energy penetrator is known as armour-piercing fin-stabilized discarding sabot (APFSDS), a type of long-rod penetrator (LRP).
To maximize the amount of kinetic energy released on the target, the penetrator must be made of a dense material, such as tungsten or depleted uranium (DU).
en.wikipedia.org /wiki/Kinetic_energy_penetrator   (734 words)

 Kinetic Energy
The kinetic energy of an object is the energy it possesses because of its motion.
Kinetic energy is an expression of the fact that a moving object can do work on anything it hits; it quantifies the amount of work the object could do as a result of its motion.
The total mechanical energy of an object is the sum of its kinetic energy and potential energy.
hyperphysics.phy-astr.gsu.edu /hbase/ke.html#ke   (224 words)

 Physics Tutoring: Kinetic Energy and Work   (Site not responding. Last check: 2007-10-22)
A: Kinetic Energy is the energy of motion.
This energy is equal to half of the object mass multiplied by its velocity squared.
Energy transferred to the object is positive work, likewise energy transferred away from the object is negative work.
www.slcc.edu /schools/hum_sci/physics/tutor/2210/kinetic_energy   (392 words)

 The Physics Classroom
Mechanical energy is the energy which is possessed by an object due to its motion or its stored energy of position.
Because the moving wind has mechanical energy (in the form of kinetic energy), it is able to do work on the blades.
As already mentioned, the mechanical energy of an object can be the result of its motion (i.e., kinetic energy) and/or the result of its stored energy of position (i.e., potential energy).
www.physicsclassroom.com /Class/energy/U5L1d.html   (1285 words)

 Kinetic Energy   (Site not responding. Last check: 2007-10-22)
That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four; for a threefold increase in speed, the kinetic energy will increase by a factor of nine; and for a fourfold increase in speed, the kinetic energy will increase by a factor of sixteen.
Kinetic energy is a scalar quantity; it does not have a direction.
Missy Diwater, the former platform diver for the Ringling Brother's Circus had a kinetic energy of 15 000 J just prior to hitting the bucket of water.
www.glenbrook.k12.il.us /gbssci/phys/Class/energy/u5l1c.html   (440 words)

 Energy Misdefined.
Potential energy supposedly is not energy, because the concepts are too mysterious to explain, while it supposedly is energy in conserving the energy which it absorbs.
Therefore, both masses do not have the same energy; the rocket does not transform energy in proportion to ½mv²; ½mv² is not kinetic energy; and a gallon of fuel does not produce a consistent amount of ½mv².
Therefore, both masses have the same amount of energy; the rocket transforms energy in proportion to mv; mv is kinetic energy; and a gallon of fuel produces a consistent amount of mv.
nov55.com /ener.html   (794 words)

 Kinetic & Potential Energy
When the skier is at the bottom of the hill their kinetic energy is at it's maximum and their potential energy is at zero.
This simply means that the sum of the skiers initial potential and kinetic energy is equal to the sum of the skiers final potential and kinetic energy.
This causes the skier's kinetic energy to increase, as predicted by conservation of energy.
ffden-2.phys.uaf.edu /211_fall2002.web.dir/Sarah_Schlichting/Energy.html   (401 words)

 Kinetic Energy   (Site not responding. Last check: 2007-10-22)
If work, which transfers energy, is done on a roller coaster by applying a net force, such as gravity, the coaster speeds up and thereby gains kinetic energy.
Kinetic energy is a property of a moving object and depends not only on its motion but also on its mass.
Any residual kinetic energy at the end of the ride becomes heat and noise as a result of the friction of the brakes, which delivers the coaster safely back into the station.
search.eb.com /coasters/physics/Kinetic.html   (208 words)

 Kinetic Temperature, Thermal Energy
The expression for gas pressure developed from kinetic theory relates pressure and volume to the average molecular kinetic energy.
It is important to note that the average kinetic energy used here is limited to the translational kinetic energy of the molecules.
The kinetic temperature is the variable needed for subjects like heat transfer, because it is the translational kinetic energy which leads to energy transfer from a hot area (larger kinetic temperature, higher molecular speeds) to a cold area (lower molecular speeds) in direct collisional transfer.
hyperphysics.phy-astr.gsu.edu /hbase/kinetic/kintem.html   (721 words)

 Energy forms and definitions, kinetic energy and potential - basic energy concepts for teachers and students - from ...
Energy forms and definitions, kinetic energy and potential - basic energy concepts for teachers and students - from ftexploring.
Energy is being transferred, by the process of heat flow, from his body to the surrounding water.
In fact temperature in a gas is often described (not defined!) as the average kinetic energy of all the atoms and molecules in the gas.
www.ftexploring.com /energy/enrg-types.htm   (2198 words)

 Kinetic and Potential Energy
Energy is the sum of two types of energy: Potential and Kinetic Energy.
Kinetic energy is energy due to motion while potential energy is a molecule's total energy due to its attractive force (stored energy).
The energy of a molecular body is converted between these two forms with the total energy, of the moving molecule, remaining constant as long as no work is done.
www.geocities.com /yummyphysics/energy.html   (233 words)

 The Secret Lives of Eenrgy - The Energy Story - Energy Types
This category of kinetic energy will be used when the energy is contained in the motion of a single object or in the motion of a group of objects that act as a single object.
Other types of energy are often classified as being a type of kinetic energy, since their energy is due to the motion, but there are more than one object involved.
This is the equation for calculating the kinetic energy of an object, where: m = mass (in kg), v = velocity (in m/s), and KE = kinetic energy (in J = joules).
sln.fi.edu /guide/hughes/10types/typeskinetic.html   (383 words)

 Potential Energy
Gravitational potential energy is the energy stored in an object as the result of its vertical position (i.e., height).
The gravitational potential energy of the massive ball of a demolition machines is dependent on two variables - the mass of the ball and the height to which it is raised.
Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing.
www.glenbrook.k12.il.us /gbssci/phys/Class/energy/u5l1b.html   (1008 words)

 Energy - Succeed in Physical Science
That energy is proportional to the square of the velocity.
Chemical energy is potential energy until the chemical reaction puts atoms and molecules in motion.
When you feel full of energy, it means that the potential chemical energy of the food (or candy) you ate has been converted into kinetic energy of your motion.
www.school-for-champions.com /science/energy.htm   (1133 words)

 Define kinetic energy - a Whatis.com definition
Kinetic energy is the energy of motion, observable as the movement of an object, particle, or set of particles.
Any object in motion is using kinetic energy: a person walking, a thrown baseball, a crumb falling from a table, and a charged particle in an electric field are all examples of kinetic energy at work.
Objects that are not in motion possess potential energy (the other main type of energy), which is converted to kinetic energy when some force, such as gravity, acts upon the object to set it in motion.
whatis.techtarget.com /definition/0,,sid9_gci1021201,00.html?track=NL-34&ad=496484   (189 words)

 energy: Potential and Kinetic Energy
Kinetic energy is energy a body possesses because it is in motion.
The difference between kinetic energy and potential energy, and the conversion of one to the other, is demonstrated by the falling of a rock from a cliff, when its energy of position is changed to energy of motion.
As the suspended body moves upward in its swing, its kinetic energy is continuously being changed into potential energy; the higher it goes the greater becomes the energy that it owes to its position.
www.infoplease.com /ce6/sci/A0857979.html   (442 words)

 Kinetic and Potential Energy   (Site not responding. Last check: 2007-10-22)
Potential energy, on the other hand, is energy of position, not of motion.
The amount of potential energy possessed by an object is proportional to how far it was displaced from its original position.
Once the object is dropped, the potential energy begins to decrease due to reduced height, but we also now see an increase in kinetic energy because the velocity is also increasing.
www.gmhsscience.com /problems/kineticpotential.htm   (707 words)

 Physics Lecture 9 - Kinetic Energy, Potential Energy, and Work
The potential energy is useful in that it keeps us from calculating the work done by a force when the path is complicated, or tedious to follow.
Then the initial kinetic and potential energy of the system consisting of both masses is zero and the initial mechanical energy of the system is thus zero.
Since the bob starts with zero kinetic energy, the kinetic energy when it is above the peg comes from the difference in potential energy given its initial height (when we released it) and its height when it is above the peg.
dept.physics.upenn.edu /courses/gladney/phys150/lectures/lecture_oct_08_1999.html   (1197 words)

Kinetic energy is defined as the energy of a moving object.
Potential energy appears in many different forms, and is defined as the energy in matter due to its position or the arrangement of its parts.
Sound is made up of vibrations (put your hand on a stereo speaker), thermal energy consists of moving molecules in air or in an object, and mechanical energy is the combination of kinetic and potential energy of a moving object.
www.uwsp.edu /cnr/wcee/keep/Mod1/Whatis/energyforms.htm   (859 words)

 Kinetic Energy   (Site not responding. Last check: 2007-10-22)
What is important for racquet performance evaluation is the kinetic energy of the racquet and the ball.
Kinetic energy is the energy due to motion.
(KE is kinetic energy, M is the mass of the object in kilograms, and v is the velocity of the object in meters per second, m/s).
www.racquetresearch.com /kinetic.htm   (129 words)

 Howstuffworks "How Force, Power, Torque and Energy Work"
Objects that are moving, such as a roller coaster, have kinetic energy (KE).
One of the interesting things about kinetic energy is that it increases with the velocity squared.
We can calculate the kinetic energy required to go from 0 mph to 20 mph by calculating the KE at 20 mph and then subtracting the KE at 0 mph from that number.
science.howstuffworks.com /fpte9.htm   (373 words)

 Potential and kinetic energy   (Site not responding. Last check: 2007-10-22)
The kinetic energy K is the familiar quantity from mechanics, and is given in terms of the molecular masses and velocities.
Although the total energy is fixed in the NVE ensemble, its kinetic and potential contributions can fluctuate, in analogy to the way a mass trades potential for kinetic energy as it falls to the ground under gravity.
The potential energy is still free to fluctuate, and is solely responsible for the total-energy fluctuations.
www.ccr.buffalo.edu /etomica/app/modules/sites/Ljmd/Background4.html   (400 words)

The water is said to possess kinetic energy since it is moving.
As it falls, energy in the gravitational field comes out of storage and is used to move the water.
The water has energy, that is, kinetic energy, so, it has the ability to do work.
id.mind.net /~zona/mstm/physics/mechanics/energy/energy.html   (287 words)

 Howstuffworks "Animation of the Day"
If you were hanging from the edge of a cliff, you would have a good deal of potential energy because you could easily succumb to gravity and fall to the ground.
Kinetic energy is constantly being converted to potential energy and back to kinetic energy again.
When he lodges the pole, the kinetic energy carries him up in the air -- as he rises, his kinetic energy is converted into potential energy.
www.howstuffworks.com /animation10.htm   (178 words)

 Work and Kinetic Energy
The ability to do work is defined as "energy" and the ability of a particle to do work by virtue of its motion is defined as "kinetic energy".
The kinetic energy of a particle of mass m moving at velocity v is in fact 1/2*m*v
Kinetic energy must have the same units as work since the change in kinetic energy is equal to the work of a resultant force.
www.mcasco.com /p1wke.html   (1673 words)

 Kinetic Energy
Kinetic energy (and as we shall later see, all forms of ``energy'') has the units of work, which are Joules.
Now that we know that work changes kinetic energy, it is possible to give another interpretation to the notion of negative work.
This is also made clear by our previous example of negative work: if you push against a car that is rolling towards you in order to slow it down, you are indeed decreasing its kinetic energy.
theory.uwinnipeg.ca /mod_tech/node30.html   (312 words)

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