1 - Momentum Flashcards

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1
Q

Physics Principles -

0 Uniform Motion

A

NEWTON’S FIRST LAW

F net = 0 - objects in motion stay in motion unless acted upon by an external net force

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2
Q

Physics Principles -

1 Accelerated Motion

A

NEWTON’S SECOND LAW

F net does not equal 0 - an external non-zero force acting on an object equals to its mass x acceleration

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3
Q

Physics Principles -

5 Conservation of Energy

A

Deals with kinetic energy

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4
Q

How Do Force and Time Affect Momentum? (Objects Landing On Harder Surfaces / Landing On Softer Surfaces)

A

Harder landing surface - (a)
More cushioned landing surface - (b)

Vi (a) = x = Vi (b) 
Vf (a) = 0 = Vf (b)
t (a) < t (b) 
d (a) < d (b)
F (a) > F (b) 
p (a) = p (b)
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5
Q

What Is The Area Under a Net Force As a Function Of Time Graph?

A

Impulse (a change in momentum)

△p = m△v

△p = F△t

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6
Q

How Are Impulse And Momentum Related?

A

Impulse is a change in momentum.
p=mv
△p = m△v = F△t

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7
Q

What Is The Effect On Impulse If….

a) The Time Interval Doubled?
b) The Net Force Is Reduced To 1/3 Of Its Original Magnitude

A

a) Impulse is doubled

b) Impulse is reduced to 1/3

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8
Q

Two Masses In a Collision Experience The Same Or Different…

a) Force
b) Impulse
c) Velocity

A

a) Same
b) Same
c) Same

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9
Q

What Is A System?

A

A group of two or more objects that interact.

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10
Q

Physics Principle -

4 Conservation of Momentum

A

The total momentum within a system is constant.

Momentum is always conserved.

☆Only deals with isolated systems

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11
Q

Conservation of Momentum in 2 Dimensions

A

Divide into horizontal vectors (pi x = pf y) and vertical vectors (pi y = pf y)

Then use a ² + b ² = c ² (px ² + py ² = p ² ) to find the resultant p

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12
Q

Conservation of Momentum in 1 Dimension

1) Masses Rebound
2) Stick Together
3) Explosion

A

1) m₁v₁ i + m₂v₂ i = m₁v₁ f + m₂v₂ f
2) m₁v₁ i + m₂v₂ i = (m₁ + m₂)v f
3) 0 = m₁v₁ i + m₂v₂ i

☆The = sign is the event

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13
Q

What Are The Units For Impulse?

A

△p =
F△t = m△v
N⋅s = kg⋅m/s²

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14
Q

What Does It Mean When Momentum Is Conserved?

A

The total momentum of the two objects before the collision is the same as the total momentum after the collision.

p i = p f
p sys i = p sys f
(where (F net)sys = 0)
☆only deals with isolated systems

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15
Q

Whats An Isolated System?

A

There’s no external forces acting upon the object

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16
Q

Whats a Non-Isolated System?

A

There’s and external force acting upon the object

17
Q

Whats An Elastic System?

A

Ek i = Ek f

The total kinetic energy of the system is 0

18
Q

Whats An Inelastic System?

A

Ek i ≠ Ek f

The total kinetic energy is not conserved

When two objects stick together in a collision it is inelastic