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Copy of Copy of Kinetic and Potential Energy
Transcript of Copy of Copy of Kinetic and Potential Energy
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the free-fall acceleration. (9.8 m/s²) To find the height, pick an appropriate reference point like a tabletop or the ground.
To calculate potential energy, use the following formula:
To calculate kinetic energy, use the following formula:
This means that kinetic energy is directly proportional to the square of its speed. If the speed is doubled, then the kinetic energy will increase 4 times. If the speed is trebled, the kinetic energy increases by a factor of 9. The kinetic energy of an object is dependent on the square of its speed.
With every energy transformation, there is some energy that is released as thermal or mechanical energy.
Kinetic energy is the energy an object has because it is in motion. Any object that moves has kinetic energy. Even atoms and molecules have kinetic energy.
This ball has kinetic energy when it rolls down the hill.
These are more examples of kinetic energy. Both the skier and the runner are using kinetic energy to move as fast as they can.
There are two factors that influence kinetic energy: the mass and the speed of the object.
Energy that is stored up ready to be used in the future is called potential energy, because it has the potential (or ability) to do something useful later on. An object usually has potential energy because a force has moved it to a different position or changed it in some other way.
Angry Birds provides another example of energy transformations. The yellow bird (under red arrow) sitting on the slingshot has potential energy because of its position (height).
Speed also effects kinetic energy. The runner in the white shirt has more kinetic energy than the runner in the black shirt because the runner in white is running faster.
There are 2 factors which effect gravitational potential energy: the mass and the height of objects. The more mass an object has, the greater its gravitational potential energy.
Energy is transforming all the time between potential, kinetic, and other forms. The ball at the top of the hill has energy stored as potential energy. The energy came from the kinetic energy the man used to push the ball up the hill.
In this scene, it is possible to see that the slingshot is pulled back. The kinetic energy of the person pulling back the slingshot is transferred to the slingshot and transformed into elastic potential energy.
The yellow bird’s potential energy is transformed to kinetic energy as it is released from the slingshot and flies through the air.
When the yellow bird hits the rock, some of the kinetic energy is transformed into sound and thermal energy while some is also transferred to the rock and transformed into potential energy.
Energy cannot be created or destroyed. This means that the total amount of energy does not change, but the forms of energy do change.
Energy may increase in a system, but it has to come from an external source.
In terms of thermodynamics, the net change in energy is the energy transferred as work and as heat.
Dobson, K., John S. Holman, and Michael Roberts. "Work and Energy." Physical science: with earth and space science. Orlando: Holt, Rinehart and Winston, 2008. 444-457. Print.
"Energy In-Depth--Potential and Kinetic Energy Â» Explore More: The Future of Energy." Iowa Public Television. Iowa Public Television, n.d. Web. 5 Apr. 2012. <http://www.iptv.org/exploremore/energy/Energy_In_Depth/sections/potential.cfm>.
"Energy Part 2: Kinds of Energy." Capital Region Science Education Partner. National Science Foundation, n.d. Web. 4 Apr. 2012. <www.crsep.org/PerplexingPairs/EnergyPartII.KindsofEnergy100803.pdf>.
Henderson, Tom . "Potential Energy." The Physics Classroom. N.p., n.d. Web. 2 Apr. 2012. <http://www.physicsclassroom.com/class/energy/u5l1b.cfm>.
Kindersley, Dorling. "ENERGY." Teacher Lesson Plans, Pintables & Worksheets by Grade or Subject - TeacherVision.com. Family Education Network, n.d. Web. 12 Apr. 2012. <http://www.teachervision.fen.com/dk/science/encyclopedia/energy.html>.
"The Energy Story - Chapter 1: Energy - What Is It? ." Energy Quest Room. California Energy Commission, n.d. Web. 11 Apr. 2012. <http://www.energyquest.ca.gov/story/chapter01.html>.
During photosynthesis, radiant energy from the sun is converted into chemical energy and stored as glucose or sugar.
This spectacular kick is possible because the soccer player's potential chemical energy was transformed into kinetic energy so he could run, jump, and kick.
Some of the kinetic energy of the soccer player was transferred to the ball enabling the ball to go flying to its target.
Our star soccer player eats food which contains chemical energy from plants and/or animals. Some of this energy is then transferred to him and stored in his body as potential chemical energy.
This is a good place to start. Fusion happens here as 4 hydrogen atoms combine to form 1 helium atom, with a loss of matter. This matter is emitted as radiant energy.
Kinetic energy is measured in Joules:
Kinetic energy = ½ x mass x speed squared.
Potential energy is stored energy – just waiting for a chance to explode into action – like this skier and runner.
There are several different types of potential energy. We know about chemical potential energy from food but there are other types including electical, gravitational, and elastic potential energy.
When thunderclouds move through the sky, they build up a large amount of electricity inside themselves. This is known as static electricity, which is a store of energy. When a cloud builds up more static electricity than it can store, some of the electricity flows from the cloud to Earth in a bolt of lightning. (TeacherVision)
A snowdrift on top of a mountain has a huge amount of potential energy. This is known as gravitational potential energy because it is gravity that is constantly trying to pull the snow down the mountain to the bottom. (TeacherVision)
Elastic potential energy powers bows and catapults. It takes effort to stretch a piece of elastic or rubber. As the elastic stretches, the molecules move away from one another and gain potential energy.
The speed of an object has a greater effect on kinetic energy than its mass.
This bowling ball has greater kinetic energy because it has more mass than the marble.
There is also a direct relation between gravitational potential energy and the height of an object. The higher that an object is elevated, the greater the gravitational potential energy.
Compressing parts together has the same effect - like the compressed spring of a dart gun - it takes force which is stored as potential elastic energy.
Some of the man’s kinetic energy is transferred to the ball and becomes potential energy. As the ball rolls down the hill, its potential energy changes to kinetic energy because it is moving.
The elastic potential energy of the slingshot will be transferred to the yellow bird and added to its stored potential energy. This will transform to kinetic energy as soon as the bird is released.
A swinging hammer has a lot of kinetic energy. As it strikes a nail, it slows down and loses its kinetic energy. The energy does not disappear, however. Some of it goes to split the wood to make way for the nail, some passes into the wood as heat or thermal energy from the force of friction, and some is converted into mechanical energy as sound, "WHAP!"