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Chapter 6: Power
Physics Flashcards
31
Physics
11th Grade
02/18/2008

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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 - KE1

Wnet = 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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