Thermal Energy

Kinetic Energy - hdbk1010_132

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KE mv² 2g_c 10 lbm 2 8 ft sec 2 lbf sec² 32.17 lbm ft KE (5 lbm) 64 ft² sec² lbf sec² 32.17 lbm ft Energy, Work, and Power ENERGY AND WORK Rev. 0 Page 3 CP-05 where: KE = kinetic energy in ft-lbf m = mass in lbm v = velocity in ft/sec g = (32.17 lbm-ft)/(lbf-sec ) c 2 Example: What is the kinetic energy of a 10 lbm object that has a velocity of 8 ft/sec? Answer: KE = 9.95 ft-lbf The kinetic energy of an object represents the amount of energy required to increase the velocity of the object from rest (v = 0) to its final velocity, or the work it can do as it pushes against something in slowing down (waterwheel or turbine, for example.) Thermal Energy Thermal energy is that energy related to temperature (the higher the temperature, the greater the molecular movement, and the greater the energy). If one object has more thermal energy than an adjacent substance, the substance at the higher temperature will transfer thermal energy (at a molecular level) to the other substance. Note that the energy is moving from one place to another (it is in motion) and is referred to as transient energy or, more commonly in the case of thermal energy, heat. The only stored energy in a solid material is internal energy. Internal energy is the energy stored in a substance because of the motion and position of the particles of the substance. Heat and internal energy will be covered in the Fundamentals Manual on Heat Transfer, Fluid Flow, and Thermodynamics. Mechanical Energy Mechanical energy is energy related to motion or position. Transient mechanical energy is commonly referred to as work. Stored mechanical energy exists in one of two forms: kinetic or potential. Kinetic and potential energy can be found in both fluids and solid objects.

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