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Physics > Momentum > Flashcards

Momentum Flashcards

1
Q

Is a measure of an object’s inertia of motion. Isaac Newton call this property of an object its “quantity of motion”

A

Momentum (p)

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2
Q

The unit of momentum is

A

kg.m/s

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3
Q

Momentum is a vector quantity and is always in the same direction as the object’s velocity vector

True or False

A

True

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4
Q

is defined by the product p = mv

A

Linear momentum

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5
Q

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

A

True

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6
Q

An unbalanced force on an object does not change its momentum

True or False

A

False

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7
Q

The product of a force and the time the force is exerted

A

Impulse (i)

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8
Q

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

A

True

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9
Q

The impulse of a net force on a system is not equal to the change in momentum of a system

True or False

A

False

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10
Q

The magnitude and direction of the impulse vector is the same as the momentum difference vector

True or False

A

True

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11
Q

Is the velocity given to one object within a system by other parts of the system

A

Recoil

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12
Q

Internal forces do not change the overall momentum of a system – only external forces do

True or False

A

True

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13
Q

Momentum of a system is observed when the net external force acting on a system is zero

True or False

A

True

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14
Q

The momentum of a system is conserved unless an unbalanced internal force acts on a system

True or False

A

False (external force)

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15
Q

In an elastic collision, only conservative forces act; therefore, total mechanical energy is conserved

True or False

A

True

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16
Q

Internal nonconservative forces can change the kinetic energy of internal particles of a system as well as their momenta

True or False

A

True

17
Q

The momentum of the system is not conserved unless an unbalanced external force acts on a system

True or False

A

False

18
Q

Since no external force is exerted on the system, the momentum of the system must be the same

True or False

A

True

19
Q

In an elastic collision, only conservative forces act and both momentum and mechanical energy is conserved.

True or False

A

True

20
Q

In partially elastic collision one or more of the colliding masses is deformed, but the masses rebound away

True or False

A

True

21
Q

In inelastic collisions colliding masses stick together and do not conserve mechanical energy

True or False

A

True

22
Q

Internal, nonconservative forces cannot change the kinetic energy of internal particles of a system as well as their momenta.

True or False

A

False

23
Q

Ideally momentum is conserved within a system while kinetic energy is not

True or False

A

True

24
Q

In Inelastic collisions kinetic energy is not conserved

True or False

A

True

25
Q

An experimental device that depends on completely inelastic collisions is called

A

Ballistic pendulum

26
Q

Most collisions do not occur in two or three dimensions and momentum is not conserved in two or three-dimensional collisions

True or False

A

False

27
Q

When two identical particle-like object collide elastically, the post-collision angle between the objects’ paths is exactly 90 deg

True or False

A

True

28
Q

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

A

Center of mass

29
Q

Momentum is a vector quantity that can be oriented in any direction

True or False

A

True

30
Q

Mass moving in a circle is said to have

A

angular momentum

31
Q

Angular momentum is conserved unless an external force is applied to the rotating system

True or False

A

True

Physics (6 decks)

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