Search results
Results from the WOW.Com Content Network
The kinetic energy is equal to 1/2 the product of the mass and the square of the speed. In formula form: where is the mass and is the speed (magnitude of the velocity) of the body. In SI units, mass is measured in kilograms, speed in metres per second, and the resulting kinetic energy is in joules.
The kinetic energy of the system of particles is given by. K = ∑ i 1 2miv2 i = 1 2∑ i mi→vi ⋅ →vi = 1 2∑ i mi(→vcm, i + →Vcm) ⋅ (→vcm, i + →Vcm) where Equation 15.2.6 has been used to express →vi in terms of →vcm, i and →Vcm.
The kinetic energy of a system, relative to an internal frame of reference, may be called internal kinetic energy. The kinetic energy associated with random molecular motion may be called thermal energy.
Kinetic energy, form of energy that an object or a particle has by reason of its motion. Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.
The kinetic energy of a system, relative to an internal frame of reference, may be called internal kinetic energy. The kinetic energy associated with random molecular motion may be called thermal energy.
Two objects of equal mass moving with equal speeds in opposite directions have a total momentum of zero, but their total kinetic energy is definitely nonzero. Basically, the kinetic energy of a system can never be zero as long as there is any kind of motion going on in the system.
Kinetic energy is a simple concept with a simple equation that is simple to derive. Let's do it twice. Derivation using algebra alone (and assuming acceleration is constant). Start from the work-energy theorem, then add in Newton's second law of motion. ∆ K = W = F ∆ s = ma ∆ s.
Kinetic Energy. Kinetic energy is energy of motion. The SI unit for energy is the joule = newton x meter in accordance with the basic definition of energy as the capacity for doing work. The kinetic energy of an object is the energy it possesses because of its motion.
The kinetic energy of a system is the sum of the kinetic energies of all the particles in the system. Kinetic energy is relative to a frame of reference, is always positive, and is sometimes given special names for different types of motion.
Learning Objectives. By the end of this section, you will be able to: Calculate the kinetic energy of a particle given its mass and its velocity or momentum. Evaluate the kinetic energy of a body, relative to different frames of reference.