# Shared Flashcard Set

## Details

Energy & Momentum
CHs 7.3, 7.5, 7.6, 7.7, 8.1-2, 8.5, 10.4-5, 8.3-4, 8.8, 13, 11.2-6 in Young & Gellar "College Physics"
24
Physics
11/09/2010

Term
 Energy
Definition
 The ability to do workA scalar quantity associated with the state of one or more objects
Term
 Kinetic Energy (KE)
Definition
 Energy associated with the motion of a particle
Term
 Potential Energy (PE)
Definition
 Energy associated with the position and conservative forces of a particle (also considered stored energy)
Term
 Work
Definition
 Energy transfer to or from an object
Term
 Joule
Definition
 The Unit of Energy1J = 1Nm
Term
 Mechanical Energy
Definition
 includes PE and KE
Term
 Chemical Energy
Definition
 important in biology
Term
 Electromagnetic Energy
Definition
 important in industry
Term
 Thermal Energy
Definition
 heat
Term
 Nuclear Energy
Definition
 energy of atoms
Term
 Conservation of Energy
Definition
 Energy can be converted from one form to another but never created or destroyed
Term
 Kinetic Energy Formula
Definition
 K = 0.5*mass(m)*velocity(v)^2K = 0.5mv^2
Term
 Work with constant force
Definition
 W = Force(F)*distance(d)*cos(theta)W = Fdcos(theta)
Term
 Work of gravity
Definition
 W = mass(m)*gravity(g)*height(h)W = mgh
Term
 Work of a spring
Definition
 W = -0.5*Spring constant(k)*displacement(x)^2W = -0.5kx^2
Term
 Work Kinetic Energy Theorem
Definition
 net Work = final Kinetic energy - initial Kinetic energyW_net = K_f - K_i
Term
 Measuring work with variable force given a graph
Definition
 [image]       For a variable force, [image] or work is the area under the curve graphically. Remember area formulas from geometry
Term
 Power
Definition
 The rate of doing work The change in work over the change in time Pavg = delta(E)/delta(t) Pinst = dW/dt [image]
Term
 Watt
Definition
 The Unit of Power   1W = 1 J/s
Term
 Conservative forces
Definition
 a force which allows two way conversion between KE and PE   Properties: It can always be expressed as difference between initial and final values of a potential energy function It is reversible It is independent of path and depends only on initial and final points When initial and final points are the same, work is zero
Term
 Nonconservative (dissipative) forces
Definition
 Force in which energy is lost to KE and PE
Term
 Potential Energy Equations
Definition
 Conservative force potential energy [image]   Gravitational Potential Energy [image]   Elastic Potential Energy [image]
Term
 Potential Energy Curves in a graph
Definition
 Turning Point A point where the particle motion reverses   Equilibrium A point where the particle does not move Stable Equilibrium Any movement away from this point results in a force back to it (PE is minimum) Unstable Equilibrium Any movement away from this point results in a force away from it (PE is maximum) Neutral Equilibrium Any displacement away from equilibrium results in no force (PE is constant)
Term
 Conservation of Total Energy
Definition
 NOT TO BE CONFUSED WITH CONSERVATION OF MECHANICAL ENERGY    [image]   Potential Energy_initial gravity + Potential Energy_initial system + Kinetic Energy_initial + Work_other = Potential Energy_final gravity + Potential Energy_final system + Kinetic Energy_final
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