physics
positive work
theta is less than 90degrees, f,s in the same direction
Negative work
theta is between 90 and 180 f,s are in opposite directions
zero work
no force exerted, force but no displacement, if the angle between f,s is 90
conservation of energy
energy can neither be created nor destroyed simply converted from one energy to another
power
amount of energy transferred per unit time (measure of the rate at which work is done) how quickly energy is transferred or converted
Track POE
cannot use conservation of mass to solve all kinematics or dynamics problems
percent efficiency
the ratio of useful energy ouput of a system to total energy input. how well energy is transformed from one form to another
work energy theorum
if work is done on an object its energy changes, if an objects energy changes it dies work on its environment.
energy
the capacity to do work or to exert a force that moves an object
gravitational potential energy
the energy an object posseses because of its position within a magnetic field
thermal energy
sum of the kinetic energy of the vibrating particles in an object
heat
transfer of thermal energy from one object to another
temperature
the measure of the speed at which the particles are vibraring