Physics: Chapter 5
if both force and displacement are doubled, work is ___
quadrupled
force and displacement must act in the ___ direction
same
kinetic energy is a ___ quantity
scaler
work is a ___ quantity
scaler
elastic potential energy is also called what?
spring potential energy
SI unit for power
watt (W)
an object moving through displacement
work
what is the kinetic energy theorem also known as?
work-energy theorem
KE = ?
1/2mv²
w = ?
J/s or kg ∙ m²/s²
unit for potential energy
Joules (J)
Joule = ?
N ∙ m or kg ∙ m²/s²
total energy is ___ conserved
always
work energy theorem as an equation:
change in KE = KE(final) - KE(initial)
spring force is ____
conservative
work done against ___ forces can be recovered
conservative
mechanical energy is ?
conservative energy
mechanical energy is ___ in the absence of ___
conserved; friction
if either force or displacement is doubled, work is ___
doubled
doing work involves applying a ___ to an object while moving it a given distance
force
when work is done at an angle, work = ?
force ∙ COS ° ∙ displacement
work = ?
force ∙ displacement
mechanical energy depends on the amount of ___ in a system
friction
slope does NOT matter if ___ is ignored
friction
2 types of potential energy
gravitational and elastic
ex of conservative forces
gravity
work due to ___ is the change in gravitational potential energy
gravity
the SI unit for work is?
joule (J)
what is the unit for kinetic energy?
joule (J)
mass must be in what unit?
kg
2 types of energy
kinetic and potential
energy of motion is ___
kinetic energy
what says that net work done on an object is equal to the change in the kinetic energy of the object
kinetic energy theorem
say energy is neither created not destroyed, but merely changes form
law of conservation of energy
sum of all energy
mechanical energy
work is the amount of force applied to cause a change in ___
motion
work is done only if an object is ___ through a displacement while a force is applied to it
moved
work is ___ if the direction of motion is opposite the direction of the force or if the object slows down and work is done by the ___
negative; object
____ forces dissipate energy in a form that ___ be readily recovered
nonconservative; cannot
the work done by all ___ forces acting on a system equals the change in total ___ energy of the system
nonconservative; mechanical
gravitational work and gravitational potential energy should ___ appear in the work-energy theorem at the same time. Why?
not; they are equivalent
if force and displacement do not act in the same direction, they split into 2 component which are?
one parallel and one perpendicular to the direction of the displacement
potential energy is a property of a system, rather than a single object, because its due to a physical ___ in space relative to a center of force
position
work is ___ if the direction of motion is the same as the direction of the force or if the object speeds up and the net force does not work
positive
an object is said to have ___ energy associated with it when it can potentially do work from its location
potential
energy of position is ___
potential energy
rate of energy transfer
power
