1 - Momentum Flashcards
Physics Principles -
0 Uniform Motion
NEWTON’S FIRST LAW
F net = 0 - objects in motion stay in motion unless acted upon by an external net force
Physics Principles -
1 Accelerated Motion
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
Physics Principles -
5 Conservation of Energy
Deals with kinetic energy
How Do Force and Time Affect Momentum? (Objects Landing On Harder Surfaces / Landing On Softer Surfaces)
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)
What Is The Area Under a Net Force As a Function Of Time Graph?
Impulse (a change in momentum)
△p = m△v
△p = F△t
How Are Impulse And Momentum Related?
Impulse is a change in momentum.
p=mv
△p = m△v = F△t
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) Impulse is doubled
b) Impulse is reduced to 1/3
Two Masses In a Collision Experience The Same Or Different…
a) Force
b) Impulse
c) Velocity
a) Same
b) Same
c) Same
What Is A System?
A group of two or more objects that interact.
Physics Principle -
4 Conservation of Momentum
The total momentum within a system is constant.
Momentum is always conserved.
☆Only deals with isolated systems
Conservation of Momentum in 2 Dimensions
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
Conservation of Momentum in 1 Dimension
1) Masses Rebound
2) Stick Together
3) Explosion
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
What Are The Units For Impulse?
△p =
F△t = m△v
N⋅s = kg⋅m/s²
What Does It Mean When Momentum Is Conserved?
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
Whats An Isolated System?
There’s no external forces acting upon the object