Test Bank for College Physics I Exam 3
(11th edition by Hugh D Young)
hooke's law relates - ANSthe spring force to the change in the length of the spring
which objects produce a restoring force - ANSspring, steel beam, rubber band, leg bone
the spring force is - ANSin the opposite direction as the change in the spring's length
what factors contribute to improving the stability of an object - ANSwider base and lower center
of gravity
an object can remain balanced if - ANSits center of gravity is over the pivot point
the spring force is larger - ANSthe more the spring is stretched or compressed
in order for an object to be in static equilibrium - ANSboth the net force and the net torque equal
zero
for an object in static equilibrium - ANSthe net torque about any point is zero
for a particular spring, the spring constant - ANSis the same regardless of stretching or
compressing
impulse can be defined as - ANSchange of momentum
The change of momentum of a system - ANSis zero for an isolated system, equal to the net
force on the system multiplied by the time interval of the interaction, zero if the external net force
is zero
the impulse approximation is used to - ANSIgnore small forces during a collision
In a collision, one way to decrease the force of impact is to - ANSincrease the time of the impact
The direction of the momentum vector is - ANSthe same as the velocity
The forces on 2 objects during a collision - ANSare in opposite directions
The momentum of an object is - ANSmass * velocity
, Using the average force of an interaction is useful because - ANSthe time dependence of the
force can be complicated
the impulse of an interaction can be defined as - ANSFavg * Δt
the total momentum of a system is conserved if - ANSthere are no external forces acting on the
system
conservation of angular momentum explains - ANSlizards twisting in mid-air, the quick
movements of a flying bat, and the high wind speeds near the eye of a hurricane
In two-dimensional collisions momentum conservation is - ANSIn both the x and y directions
An example of conservation of angular momentum is - ANSAn ice skater changing the speed of
a spin
Two-dimensional momentum conservation works - ANSfor all collisions
In order for the angular momentum of a rotating object to be conserved - ANSNet torque must
be zero
In a two-object inelastic collision, how are the final velocities of the objects related? - ANSthey
each have the same velocity
Inelastic collisions occur when - ANSthe objects stick together
Angular momentum is defined as - ANSMoment of inertia * angular velocity
Do explosions conserve momentum? - ANSYes, because all forces are internal to the system
How does gravitational energy depend on the height, h, of an object? - ANSmgh
kinetic energy - ANSDepends on the speed and the mass of the object
Forms of potential energy include - ANSgravitational and elastic
work is done - ANSBy the component of the force parallel to the displacement
Given the distance x that a spring is compressed, what is the potential energy of the spring? -
ANS½ kx^2
Energy conservation tells us that the energy of a system can change via - ANSwork done on or
by the system and heat transfer
(11th edition by Hugh D Young)
hooke's law relates - ANSthe spring force to the change in the length of the spring
which objects produce a restoring force - ANSspring, steel beam, rubber band, leg bone
the spring force is - ANSin the opposite direction as the change in the spring's length
what factors contribute to improving the stability of an object - ANSwider base and lower center
of gravity
an object can remain balanced if - ANSits center of gravity is over the pivot point
the spring force is larger - ANSthe more the spring is stretched or compressed
in order for an object to be in static equilibrium - ANSboth the net force and the net torque equal
zero
for an object in static equilibrium - ANSthe net torque about any point is zero
for a particular spring, the spring constant - ANSis the same regardless of stretching or
compressing
impulse can be defined as - ANSchange of momentum
The change of momentum of a system - ANSis zero for an isolated system, equal to the net
force on the system multiplied by the time interval of the interaction, zero if the external net force
is zero
the impulse approximation is used to - ANSIgnore small forces during a collision
In a collision, one way to decrease the force of impact is to - ANSincrease the time of the impact
The direction of the momentum vector is - ANSthe same as the velocity
The forces on 2 objects during a collision - ANSare in opposite directions
The momentum of an object is - ANSmass * velocity
, Using the average force of an interaction is useful because - ANSthe time dependence of the
force can be complicated
the impulse of an interaction can be defined as - ANSFavg * Δt
the total momentum of a system is conserved if - ANSthere are no external forces acting on the
system
conservation of angular momentum explains - ANSlizards twisting in mid-air, the quick
movements of a flying bat, and the high wind speeds near the eye of a hurricane
In two-dimensional collisions momentum conservation is - ANSIn both the x and y directions
An example of conservation of angular momentum is - ANSAn ice skater changing the speed of
a spin
Two-dimensional momentum conservation works - ANSfor all collisions
In order for the angular momentum of a rotating object to be conserved - ANSNet torque must
be zero
In a two-object inelastic collision, how are the final velocities of the objects related? - ANSthey
each have the same velocity
Inelastic collisions occur when - ANSthe objects stick together
Angular momentum is defined as - ANSMoment of inertia * angular velocity
Do explosions conserve momentum? - ANSYes, because all forces are internal to the system
How does gravitational energy depend on the height, h, of an object? - ANSmgh
kinetic energy - ANSDepends on the speed and the mass of the object
Forms of potential energy include - ANSgravitational and elastic
work is done - ANSBy the component of the force parallel to the displacement
Given the distance x that a spring is compressed, what is the potential energy of the spring? -
ANS½ kx^2
Energy conservation tells us that the energy of a system can change via - ANSwork done on or
by the system and heat transfer
