# Shared Flashcard Set

## Details

Chapter 6: Power
Physics Flashcards
31
Physics
02/18/2008

Term
 Equation for Work
Definition
 W = Fdcos(angle)
Term
 Joule
Definition
 A unit of work measured in Newton-Meters
Term
 Acceleration
Definition
 a = V2 squared - V1 squared; all over 2d
Term
 Equation of Kinetic Energy
Definition
 KE = 1/2(mv^2)
Term
 Equation for the Work-energy Principle
Definition
 Wnet = .5(m)(v2)^2 - .5(m)(v1)^2 Wnet = KE2 - KE1Wnet = change of KE
Term
 Equation for the Gravitation of Potential Energy
Definition
 PEgrav. = mgy
Term
 Equation for the elastic potential energy
Definition
 ElasticPE = .5kx^2
Term
 Equation of speed
Definition
 v1 = square root of (2KE1/m)
Term
 Equation of Energy
Definition
 E = KE + PE = .5mv2 + mgy
Term
 Definition of Work
Definition
 the product of the magnitude of the displacement times the component of the force parallel to the displacement
Term
 Definition of Kinetic Energy
Definition
 The energy of motion from the Greek word "kinetikos" meaning motion
Term
 Definition of work-energy principle
Definition
 the net work done on an object is equal to the change in its kinetic energy
Term
 Definition of potential energy
Definition
 the energy associated with forces that depend on the position or configuration of a body (or bodies) and the surroundings
Term
 Definition of gravitational potential energy
Definition
 the rpduct of its weight mf and its height y above some reference level
Term
 Definition of "restoring forces," Hooke's Law, spring equation
Definition
 the spring exerts its force in the direction opposite the displacement (hence the minus sign), acting to return it to its nomal length
Term
 Definition of Conservative forces
Definition
 forces such as gravity, for which the work done does not depend on the path taken but only on the initial and final positions.
Term
 Example for nonconservative forces
Definition
 ex.:  friction, air resistance, tension in cord, motor, rocket propulsion, push or pull by person
Term
 definition of total mechanical energy
Definition
 the sum of the kinetic and potential energies at any moment
Term
 definition of the principle of conservation of mechanical energy
Definition
 if only conservative forces are acting, the total mechanical energy of a system neither increases nor decreases in any process it stays constant it is conserved
Term
 definition of the law of conservation of energy
Definition
 the total energy is neither increase nor decreased in any process.  Energy can be transformed from one form to another, and transferred from one body to another, but the total amount remains constant.
Term
 Definition of Dissipative forces
Definition
 frictional forces reduce the total mechanical energy
Term
 Definition of thermal energy
Definition
 heat is considered as energy
Term
 Definition of Power
Definition
 the rate at which work is done OR as the rate at which energy is transformed
Term
 Definition of the watt
Definition
 in SI units, power is measured in joules per seconds
Term
 definition of horsepower
Definition
 one horsepower is defined as 550 ft*lb/s which equals 746 W
Term
 definition of energy
Definition
 this can be defined as the ability to do work
Term
 What does k stand for?
Definition
 it stands for the spring constant
Term
 If the Gravitational potential energy is without WFfr what type of path is it?
Definition
 independent
Term
 If the Gravitational potential energy is with WFfr what type of path is it?
Definition
 dependent
Term
 Mechanical energy includes what?
Definition
 KE, Gpe, Epe, and WFfr
Term
 The large Gravitational Potential Energy Equation
Definition
 .5m(velocity 1 squared) + mg(y1) + .5k(x2 squared) = .5m(v2 squared) mg(y2) + .5k(x2 squared) + (Ffr)(d)
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