Momentum Flashcards
Is a measure of an object’s inertia of motion. Isaac Newton call this property of an object its “quantity of motion”
Momentum (p)
The unit of momentum is
kg.m/s
Momentum is a vector quantity and is always in the same direction as the object’s velocity vector
True or False
True
is defined by the product p = mv
Linear momentum
The sum of the unbalanced external forces on a system is equal to the time-rate of change of the momentum of the system
True or False
True
An unbalanced force on an object does not change its momentum
True or False
False
The product of a force and the time the force is exerted
Impulse (i)
The change of momentum of a system is directly proportional to the force sum acting on it and the time interval during which the force is exposed
True or False
True
The impulse of a net force on a system is not equal to the change in momentum of a system
True or False
False
The magnitude and direction of the impulse vector is the same as the momentum difference vector
True or False
True
Is the velocity given to one object within a system by other parts of the system
Recoil
Internal forces do not change the overall momentum of a system – only external forces do
True or False
True
Momentum of a system is observed when the net external force acting on a system is zero
True or False
True
The momentum of a system is conserved unless an unbalanced internal force acts on a system
True or False
False (external force)
In an elastic collision, only conservative forces act; therefore, total mechanical energy is conserved
True or False
True
Internal nonconservative forces can change the kinetic energy of internal particles of a system as well as their momenta
True or False
True
The momentum of the system is not conserved unless an unbalanced external force acts on a system
True or False
False
Since no external force is exerted on the system, the momentum of the system must be the same
True or False
True
In an elastic collision, only conservative forces act and both momentum and mechanical energy is conserved.
True or False
True
In partially elastic collision one or more of the colliding masses is deformed, but the masses rebound away
True or False
True
In inelastic collisions colliding masses stick together and do not conserve mechanical energy
True or False
True
Internal, nonconservative forces cannot change the kinetic energy of internal particles of a system as well as their momenta.
True or False
False
Ideally momentum is conserved within a system while kinetic energy is not
True or False
True
In Inelastic collisions kinetic energy is not conserved
True or False
True
An experimental device that depends on completely inelastic collisions is called
Ballistic pendulum
Most collisions do not occur in two or three dimensions and momentum is not conserved in two or three-dimensional collisions
True or False
False
When two identical particle-like object collide elastically, the post-collision angle between the objects’ paths is exactly 90 deg
True or False
True
Is the point in space where the mass of the entire system to be located for the purpose of determining the momentum of a system. Is proportionally closer the the parts of a multi-body system that has the greatest mass
Center of mass
Momentum is a vector quantity that can be oriented in any direction
True or False
True
Mass moving in a circle is said to have
angular momentum
Angular momentum is conserved unless an external force is applied to the rotating system
True or False
True
