Kinetic Energy

The latest articles related to Kinetic Energy

Energy Conservation

Émilie du Châtelet – Scientific research and publications

Heat and light In 1737, Châtelet published a paper entitled ”Dissertation sur la nature et la propagation du feu”, based upon her research into the science of fire, that predicted what is today known as infrared radiation and the nature of light. ”Institutions de Physique”= Her book ”Institutions de Physique” (“Lessons in Physics”) appeared in [...]

Electric vehicles

Power-to-weight ratio – Power to weight (specific power)

The power-to-weight ratio (Specific Power) formula for an engine (power plant) is the power generated by the engine divided by weight of the engine as follows: : begin{matrix} mbox{P-to-W}&= P/W \ end{matrix} A typical turbocharged V-8 diesel engine might have an engine power of and a weight of , giving it a power-to-weight ratio of [...]

Energy Conservation

Galilean invariance – Work, kinetic energy, momentum

Because the distance covered while applying a force to an object depends on the inertial frame of reference, so does the work done. Due to Newton’s law of reciprocal actions there is a reaction force; it does work depending on the inertial frame of reference in an opposite way. The total work done is independent [...]

Energy Efficiency

Fuel efficiency – Introduction

Fuel efficiency, is a form of thermal efficiency, meaning the efficiency of a process that converts chemical potential energy contained in a carrier fuel into kinetic energy or work. Overall fuel efficiency may vary per device, which in turn may vary per application, and this spectrum of variance is often illustrated as a continuous energy [...]

Energy Conservation

Francis turbine – Theory of operation

The Francis turbine is a ”reaction turbine”, which means that the working fluid changes pressure as it moves through the turbine, giving up its energy. A casement is needed to contain the water flow. The turbine is located between the high-pressure water source and the low-pressure water exit, usually at the base of a dam. [...]

Energy Efficiency

Internal combustion engine – Measures of engine performance

Engine types vary greatly in a number of different ways: *energy efficiency *fuel/propellant consumption (brake specific fuel consumption for shaft engines, thrust specific fuel consumption for jet engines) *power to weight ratio *thrust to weight ratio *Torque curves (for shaft engines) thrust lapse (jet engines) *Compression ratio for piston engines, Overall pressure ratio for jet [...]

Energy Conservation

Energy – Regarding applications of the concept of energy

Energy is subject to a strict global conservation law; that is, whenever one measures (or calculates) the total energy of a system of particles whose interactions do not depend explicitly on time, it is found that the total energy of the system always remains constant. *The total energy of a system can be subdivided and [...]

Energy Conservation

Tautochrone curve – Abel’s solution

Abel attacked a generalized version of the tautochrone problem (”Abel’s mechanical problem”), namely, given a function ”T”(”y”) that specifies the total time of descent for a given starting height, find an equation of the curve that yields this result. The tautochrone problem is a special case of Abel’s mechanical problem when ”T”(”y”) is a constant. [...]

Energy Conservation

Pendulum (mathematics) – Simple gravity pendulum

A simple pendulum is an idealisation, working on the assumption that: * The rod or cord on which the bob swings is massless, inextensible and always remains taut; * Motion occurs in a 2-dimensional plane, i.e. the bob does not trace an ellipse. * The motion does not lose energy to friction. * Air resistance [...]

Energy Conservation

Dynamic pressure – Physical meaning

Dynamic pressure is closely related to the kinetic energy of a fluid particle, since both quantities are proportional to the particle’s mass (through the density, in the case of dynamic pressure) and square of the velocity. Dynamic pressure is in fact one of the terms of Bernoulli’s equation, which is essentially an equation of energy [...]

Energy Conservation

Potential energy – Introduction

Potential energy is energy that is stored within a system. It exists when there is a force that tends to pull an object back towards some lower energy position. This force is often called a restoring force. For example, when a spring is stretched to the left, it exerts a force to the right so [...]