1 / 2
AP Physics 1 Unit 4 Test with Verified Answers Rated A
What is work? (ch7) - -Work is done on an
object by a force when the object moves through a
distance.
Work equation (no trig) (ch7) - -W=
F(vector)d(vector)
Is work a vector quantity? (ch7) - -No (it is a
scalar quantity, although it is the product of two
vector quantities)
Scalar product of any two vectors A and B (ch7) -
-ABcosθ
Work equation (trig) (ch7) - -W=Fdcosθ
What is kinetic energy? (ch7) - -energy of
motion (an object in motion has the ability to do work)
What is energy? (ch7) - -the ability to do work
(Translational) kinetic energy equation (ch7) - -
K=½mv²
Work-energy principle (words) (ch7) - -The net
work done on an object is equal to the change in the
object's kinetic energy
Work-energy principle (equation) (ch7) - -
Wnet=∆K=½mv₁²-½mv₂²
What is a conservative force? (ch8) - -(A force
for which) the work done by it in moving an object
from one position to another depends only on the two
positions and NOT on the path taken (**Path
independent**)
What is the difference, other than the definition,
between conservative forces such as mechanical
energy and non conservative forces such as friction?
(ch8) - -The work done by a conservative force
is recoverable
What is potential energy? (ch8) - -Energy
associated with conservative forces that depend on
the position or configuration of objects
Gravitational potential energy equation (ch8) - -
Ugrav=mgh (h=height above some reference point)
Elastic potential energy equation (ch8) - -
U=½kx²
what is the x in the elastic potential energy equation?
(ch8) - -distance from its natural
(unstretched/uncompressed) length
Mechanical energy symbol and definition (ch8) -
-E is the sum of kinetic and potential energies
Law of conservation of energy definition (ch8) -
-the total energy of a system is always
conserved
When is mechanical energy conserved (within a
system) ? (ch8) - -when only conservative
forces act in that system
What is power? (2 defs) (ch8) - -the rate at
which work is done, or the rate at which energy is
transformed from one form to another
Power equation (ch8) - -P= F(vector)v(vector)
Newton's First Law of Motion (Law of inertia) - -
if the net force on an object is zero, then an object
originally at rest remains at rest and an object in
