COLLEGE PHYSICS FREEDMAN CHAPTER 28
ESSENTIAL STUDY QUESTIONS AND ANSWERS
◉ In a collision, one way to decrease the force of impact is to.
Answer: increase the time of the impact
◉ The direction of the momentum vector is.
Answer: the same as the velocity
◉ The forces on 2 objects during a collision.
Answer: are in opposite directions
◉ The momentum of an object is.
Answer: mass * velocity
◉ Using the average force of an interaction is useful because.
Answer: the time dependence of the force can be complicated
◉ the impulse of an interaction can be defined as.
Answer: Favg * Δt
,◉ the total momentum of a system is conserved if.
Answer: there are no external forces acting on the system
◉ conservation of angular momentum explains.
Answer: lizards 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.
Answer: In both the x and y directions
◉ An example of conservation of angular momentum is.
Answer: An ice skater changing the speed of a spin
◉ Two-dimensional momentum conservation works.
Answer: for all collisions
◉ In order for the angular momentum of a rotating object to be
conserved.
Answer: Net torque must be zero
◉ In a two-object inelastic collision, how are the final velocities of
the objects related?.
, Answer: they each have the same velocity
◉ Inelastic collisions occur when.
Answer: the objects stick together
◉ Angular momentum is defined as.
Answer: Moment of inertia * angular velocity
◉ Do explosions conserve momentum?.
Answer: Yes, because all forces are internal to the system
◉ How does gravitational energy depend on the height, h, of an
object?.
Answer: mgh
◉ kinetic energy.
Answer: Depends on the speed and the mass of the object
◉ Forms of potential energy include.
Answer: gravitational and elastic
◉ work is done.
ESSENTIAL STUDY QUESTIONS AND ANSWERS
◉ In a collision, one way to decrease the force of impact is to.
Answer: increase the time of the impact
◉ The direction of the momentum vector is.
Answer: the same as the velocity
◉ The forces on 2 objects during a collision.
Answer: are in opposite directions
◉ The momentum of an object is.
Answer: mass * velocity
◉ Using the average force of an interaction is useful because.
Answer: the time dependence of the force can be complicated
◉ the impulse of an interaction can be defined as.
Answer: Favg * Δt
,◉ the total momentum of a system is conserved if.
Answer: there are no external forces acting on the system
◉ conservation of angular momentum explains.
Answer: lizards 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.
Answer: In both the x and y directions
◉ An example of conservation of angular momentum is.
Answer: An ice skater changing the speed of a spin
◉ Two-dimensional momentum conservation works.
Answer: for all collisions
◉ In order for the angular momentum of a rotating object to be
conserved.
Answer: Net torque must be zero
◉ In a two-object inelastic collision, how are the final velocities of
the objects related?.
, Answer: they each have the same velocity
◉ Inelastic collisions occur when.
Answer: the objects stick together
◉ Angular momentum is defined as.
Answer: Moment of inertia * angular velocity
◉ Do explosions conserve momentum?.
Answer: Yes, because all forces are internal to the system
◉ How does gravitational energy depend on the height, h, of an
object?.
Answer: mgh
◉ kinetic energy.
Answer: Depends on the speed and the mass of the object
◉ Forms of potential energy include.
Answer: gravitational and elastic
◉ work is done.
