Energy is the volume to perform work. You have a sense of what occupational is from regular life, it"s things that call for effort. Energy and work have the very same units.
You are watching: Which of the following is an example of kinetic energy?
At the end of the ten century, a quantity was introduced into mechanics to explain collisions in between two perfectly elastic bodies, in i m sorry one body makes a head-on collision v an similar body at rest. The first body stops, and the second body moves off v the early stage velocity the the very first body. (If you have ever played billiards or croquet, or seen a model of Newton’s Cradle, you have observed this kind of collision.) The idea behind this amount was regarded the pressures acting on a body and was referred to as “the energy of motion.” later on, during the eighteenth century, the namekinetic energywas offered to power of motion.
The equation for kinetic energy is
where (KE) is kinetic energy, (m) is mass, and also (v) is velocity. This an interpretation should do sense: big things moving fast have the most energy, the most ability to shove other things or knock lock over, etc.
Potential energy is power that originates from position. There are many different seasonings of potential energy with two disputed below.
Gravitational Potential Energy
Gravitational potential power is the power that objects that space "high up" in a gravitation field (e.g., surface of earth). The equation for potential power from gravity is
where (PE) is potential energy, (m) is mass, (g) is the acceleration that gravity, and also (h) is the height. This renders the devices of energy an extremely clear:
< extmass imes extdistance imes extacceleration onumber>
< extforce imes extdistance onumber>
which both pertains to units of kg•m2s-2.
Coulombic Potential Energy
In 4476mountvernon.comistry, the force that leads to potential power is almost always the Coulomb force, no gravity.The PE of 2 charged corpuscle at a distance deserve to be uncovered through the equation:
(r)is street (q_1)and (q_2)are the fees (epsilon_o)is (8.85 imes 10^-12, C^2/J,m)
When the charges have actually the very same sign, lock repel and also will accelerate away from each other if permitted to move; the potential energy has a hopeful sign. As soon as the charges have actually the the contrary sign, they tempt each other and have an unfavorable potential energy. If castle are permitted to gain closer together, the potential energy will get an ext negative. If they are separated, (r)gets bigger and the potential power approaches zero.
For charges v the exact same sign, (E) has a + sign and also tends to acquire smaller as (r) increases. This can describe why prefer charges repel each other. Systems prefer a low PE and thus repel each various other which boosts the distance between them ((r)) and lowers the PE.
For fees with different charges, the contrary of what is stated over is true. (E)has a - authorize which becomes even much more negative together the opposite charged particles attract, or come closer together.
Conservation that Energy
You most likely learned about conservation the energy already in a physics class. Because that instance, if you have actually a pendulum as shown, at place 1 the weight has actually some potential energy, yet no kinetic energy. When you release the weight, the weight falls, moving through place 2. At position 2, some of the potential power has been converted come kinetic energy. Finally, at position 3, every the potential energy has been converted to kinetic energy. As it passes 3, the process is reversed, and also kinetic energy is convert to potential energy. Once the weight reaches place 4, all the kinetic power has to be converted earlier to the same amount of potential power it started with at 1. This is just one example of conservation of energy. It is a basic observation that the quantity of power in the universe doesn"t change, and the amount of energy in a specific system doesn"t adjust unless there is a circulation of power in or out.
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