WORK AND POWER Flashcards
to have mechanical work performed we need what
to have displacement
which type of a work does a gymnast landing a dismount do
negative work
what type of work friction does when a skier sliding down a hill
negative work
work performed by external force other than gravity cause what
change in energy of the object
what is energy
capacity to perform work
t/f work is an engery transfer
t
what is work
the product of force and the amount of displacement in the direction of that force.
when does negative work is done
by a force acting on an object if the object is displaced in the direction opposite the force acting on it
t/f if a object start at 2m and finish at 2m then there is no mechanical work that was done
true, for exemple, when lifting a barbell the work is -700j and when lowering it the work is 700J. since the barbell was at same position when the lift start and the lift end, they was no total work
what is power
express the amount of mechanical work performed in a given time interval.
ability to do large amount of work in short time
what is mechanical energy
composed of energy associated with position and energy associated with motion.
what is kinetic energy
is the capacity
of an object to perform work
because it is in motion.
what is potential energy
the capacity of an
object to perform work because of its
position or deformation.
what is gravitational potential energy
energy due to an object position relative to the earth
what is strain/elastic energy
due to the deformation of an object
