Momentum
Definition:
a measurable quantity of motion, which is a vector has the same direction as its velocity
Mass in motion
Symbol of momentum: ρ (rho), or small case p.
How is momentum calculated?
Mass x velocity
ρ=mv
Units for momentum: Kg x m/s
What is needed in order to change an object's momentum?
An unbalanced force
What determines how much the momentum changes?
The size of the applied force
The time (duration) of the applied force
a measurable quantity of motion, which is a vector has the same direction as its velocity
Mass in motion
Symbol of momentum: ρ (rho), or small case p.
How is momentum calculated?
Mass x velocity
ρ=mv
Units for momentum: Kg x m/s
What is needed in order to change an object's momentum?
An unbalanced force
What determines how much the momentum changes?
The size of the applied force
The time (duration) of the applied force
Impulse
Definition: a force applied for a specific amount of time
Symbol: I
Calculation: force x time- I=Ft
Units: Newton second- N x s
Symbol: I
Calculation: force x time- I=Ft
Units: Newton second- N x s
Relationship between impulse and momentum:
Impulse equals the change in momentum that it causes
Impulse-Momentum theorem: I=∆ρ
Formula
F = m • aor
F = m • ∆v / t
If both sides of the above equation are multiplied by the quantity t, a new equation results.
F • t = m • ∆v
So Impulse = Change in momentum, and this equation above is known as impulse-momentum change equation.
For a given ∆ρ, N and t are inversely related (because I=Nt)
F = m • ∆v / t
If both sides of the above equation are multiplied by the quantity t, a new equation results.
F • t = m • ∆v
So Impulse = Change in momentum, and this equation above is known as impulse-momentum change equation.
For a given ∆ρ, N and t are inversely related (because I=Nt)
Rebouding
Definition: a collision that objects bounce off each other
Notice: the velocity of the object involves a change in direction
Notice: the velocity of the object involves a change in direction