Momentum is the variation of the amount of movement or linear momentum.
Index
MOMENTUM FORMULA AND AMOUNT OF MOTION
If we consider a mass that remains constant in time under the action of a constant force, the quantity of motion is the product of the velocity (v) and the mass (m). According to the Newton's second lawif to a mass m a force is applied F The latter acquires an acceleration aaccording to the expression:
F=ma
multiplying both members by the time where the designated force is applied:
FΔt = maΔt
Like aΔt = Δvwe have:
FΔt = mΔt = mΔv
and finally:
I=FΔt
Momentum is the force per time variation. It is also represented as the change in the amount of motion.
AMOUNT OF MOVEMENT
The quantity of motion is defined as the mass times the change in velocity. It is used to differentiate between 2 bodies with the same velocity but different mass.
p=mΔv
The momentum applied to a body is also equal to the change in the amount of motion, so another way to calculate the momentum is:
I=Δp
Equating the 2 formulas for calculating momentum, it can be said that the force per time variation will be equal to the mass per velocity variation.
FΔt = mΔt = mΔv
IMPULSE APPLICATIONS
Momentum is very important as soon as the variable time variation. This explains that by applying a force in a very small interval, achieving a variation of movement, the equivalent force becomes almost infinite. This is applicable to the dry strokes, to making a jump, ..., these are situations that only work if the time in which the force is applied is very small.
IMPULSE CONFUSED WITH NEWTON'S FIRST LAW
Sometimes this momentum force is confused with Newton's first law. Here are some examples