Tag: momentum (p)

The initial momentum of ball $P _1 = m\vec{v} $, after batsman hits ball and reverses its direction, momentum of ball $P _2= -m\vec{v} $
Magnitude of change in momentum $\Delta p = \left | P _2-P _1\right | =\left | - 2m \vec{v}\right | =2m \left | \vec{v}\right | $ 
from data given in question $  m=0.15 kg ;\;  \left | \vec{ v} \right |= 12m/ s$
$\Delta P=2\times 0.15\times 12= 3. 6 kg m/ s $

Momentum of truck $ P _{truck}= m _{truck}v _{truck}$
from given data in question $ m _{truck} = 38000 \; kg;\; v _{truck}= 1.2\; m/s$
$P _{truck}= 38000\times 1.2= 45600 \; kg m/ s$
the momentum of car is equal to momentum of truck $P _{car}= m _{car}v _{car}\Rightarrow v _{car}= 45600/ 1400= 32.57 m/s$

Momentum is  the quantity of motion of a moving body, measured as a product of its mass and velocity.

While opening the door the force applied is tangential to the motion of the door.
While applying brakes the motion is on a different axis to the force applied,
When a batsman hits a ball, both the ball and the force applied are in the same direction
While drawing water from the well the motion and the force are in different directions (mostly tangential)

$\Delta P = F\Delta t = 10 \times 10 = 100 kg m/s$

Mass of a body is the quantity of inertia possessed by it, or in simpler words, it is the measure of resistance that a body can provide to change in its motion.
Speed is the measure of how fast a body is moving.
Velocity is the measure of how fast a body is moving along with its direction.
Linear momentum is the quantity which denoted the motion of body along with its direction.

If a ball freely falling from a height the net force applied on the ball is not zero as gravity is acting on it.

If the collision of the ball and the wall is elastic one then the change in the momentum of the ball after collision is $= mu-(-mu)=2mu$ away from the wall.

Given :   $m = 10$ kg             $v = 36$ km/hr $ = 36\times \dfrac{5}{18}  = 10$ m/s

Given :   $m =20$ kg