Law of conservation of momentum of the formula

Momentum is a vector quantity (denoted $\overrightarrow{p}$) equal to the product of mass at speed and is defined by the formula:Impulse formula

Law of conservation of momentum in a closed system (there are no external forces) the vector sum of the pulses before the collision is equal to the vector sum of the pulses after the collision.

Law of conservation of momentum in a closed system

$\overrightarrow{p_1}$, $\overrightarrow{p_2}$ – initial pulses of bodies before interaction of bodies, kg·m / s;

$\overrightarrow{p_1^ {}}$, $\overrightarrow{p_2^ {}}$ — impulses of bodies after interaction of bodies, kg·m/s.

Elastic collision of bodies (for example, balls)

Elastic collision of bodies

Formula for elastic collision of bodies:

Formula for elastic collision of bodies

m1 – mass of first body, kg;

m2 – mass of second body, kg;

$\overrightarrow{v_1}$ is the velocity of first body before impact, m/s;

$\overrightarrow{v_2}$ is the velocity of second body before impact, m/s;

$\overrightarrow{v_1^{}}$ – the velocity of first body after collision, m/s;

$\overrightarrow{v_2^{}}$ – the velocity of second body after the collision, m/s.

Inelastic collision of bodies (for example, balls)

Inelastic collision of bodies

Formula for inelastic collision of bodies:

Formula for inelastic collision of bodies

$\overrightarrow{v^{}}$ – the speed of bodies after a collision, m/s.

Examples of applying the laws of conservation of momentum are the collision of balls, cars, recoil when shooting, jet movement, etc.

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