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Work & Energy
Transcript of Work & Energy
Unit of Energy (J)
The metric unit for energy is joule (J) named after it's creator James Joule. Joules are a unit of energy that is defined as the ability to do work. In science work is described as energy. Work is done when a force causes an object to move.
Forms of Energy
Energy- The ability to do work
Kinetic Energy- Energy of an object in motion
Kinetic energy is a form of energy which can be easily detected in its simplest forms.Kinetic energy is only difficult to detect when it is in an electrical and thermal form. Thermal energy is the total amount of all the kinetic energies of all the particles in an object or substance.
Forms of Energy
Potential energy is a type of energy that can be restored. There are two forms of energy that can be classified into two categories for instant potential energy and kinetic energy. For example a bowling ball would be able to work because it was in motion/moving. When an object is in action it is called kinetic energy. In most situations the motion is hard to detect. For example electricity, and thermal energy. Since all of the particles are involved with one another they're all in motion. Thermal energy is the total amount of all kinetic energy in an object or substance. When the energy transfers it is called heat. It doesn't involve energy all the time because an object can also store it and reuse it later on. In addition, when it's time to store the energy that is called potential energy. For example, a body gets energy from the chemicals in the food that they eat. Plants and animals, get their energy as they grow. They would often convert it into other forms of energy when they need to. A bow stores it's elastic energy then releases it once you let go.
Gravitational Potential Energy
"Calculating Work." Calculating Work. N.p., n.d. Web. 2 Feb. 2014. <http://www2.franciscan.edu/academic/mathsci/mathscienceintegation/MathScienceIntegation-1011.htm>.
"Potential & Kinetic Energy â€“ Marshmallow Catapult." Kids Blog. N.p., n.d. Web. 3 Feb. 2014. <http://www.imcpl.org/kids/blog/?p=9040>.
Sandner, Lionel. "Wok & Energy." Investigating Science and Technology 8. Canada: Pearson, 2008. 106-112. Print.
PE gravitational= weight X height= MGH
Gravitational Energy- Happens because of the force of gravity caused by the attraction of all other masses. When you lift an object the gravitational energy is increased.
GPE- Gravitational Potential Energy
h=height above the surface
The amount of work done on an object depends on how much force is applied and the distance that object moved because of that force.
To calculate how much work was applied to an object when the object moves in the same direction of the force you use this equation:
(work in joules)= (force in newtons) x (distance in meters)
To find out how much work it takes to lift and object, you still use the equation
but you still need to figure out how much forces needed. To find out the force of gravity you use the mass of an object to find out the weight. 1.0 kg mass is the same as 9.8 kgs of weight. Therefor if you multiply the mass of an object by 9.8 you get the force of gravity. this can be put in an equation:
Calculating Joules As Work
The equation for work is Work= Force x Distance
W= F x D