Physics 121 - Exam 2 Question and
answers already passed 2025
free fall - correct answer ✔no forces act on an object other than the
gravitational force that makes the object fall
rigid body - correct answer ✔one for which the distance between any two
points of the body remains the same when the body is translated or rotated
conservation law - correct answer ✔a physical principle that identifies some
quantity that does not change with time
Work - correct answer ✔an energy transfer that occurs when a force acts on
an object that moves
translational kinetic energy - correct answer ✔The total work done is equal to
the change in the quantity 1/2mv^2
potential energy - correct answer ✔Stored energy due to the interaction of an
object with something else that can easily be recovered as kinetic energy
conservative forces - correct answer ✔Forces that have potential energies
associated with them
mechanical energy - correct answer ✔The sum of the kinetic and potential
energies (K + U)
elastic potential energy - correct answer ✔The kind of potential energy
stored in a spring
answers already passed 2025
free fall - correct answer ✔no forces act on an object other than the
gravitational force that makes the object fall
rigid body - correct answer ✔one for which the distance between any two
points of the body remains the same when the body is translated or rotated
conservation law - correct answer ✔a physical principle that identifies some
quantity that does not change with time
Work - correct answer ✔an energy transfer that occurs when a force acts on
an object that moves
translational kinetic energy - correct answer ✔The total work done is equal to
the change in the quantity 1/2mv^2
potential energy - correct answer ✔Stored energy due to the interaction of an
object with something else that can easily be recovered as kinetic energy
conservative forces - correct answer ✔Forces that have potential energies
associated with them
mechanical energy - correct answer ✔The sum of the kinetic and potential
energies (K + U)
elastic potential energy - correct answer ✔The kind of potential energy
stored in a spring
