Question

Define momentum and write its units.​

Answer 1

Answer:

✅Momentum : Momentum(P) of a body is defined as the product of mass(m) and velocity(v).

P = mv

✅Units : SI unit - Kg. m/s CGS unit - gm.cm/s

$hope \: it \: helps \: dear.....$

Answer 2

Momentum :

Momentum of a body $(\vec{p})$

is defined as the product of the mass (m) and it's velocity $(\vec{v})$ i.e,

${\purple{\boxed{\large{\bold{\vec{p}=m\vec{v}}}}}}$

⇒Linear momentum depends on frame of reference .

⇒SI unit of momentum is kgm/s

⇒Dimension [MLT^-1]

⇒Momemtum is a vector quantity.

Relation between Momentum and kinetic energy :

Consider a body of mass M moving with velocity v linear momentum of the body ,

p=mv

KE of a particle can be expressed as

$E = \frac{1}{2}mv{}^{2} = \frac{mv {}^{2} }{2} = \frac{p {}^{2} }{2m}$

$\implies E= \frac{p {}^{2} }{2m} \: or \: p = \sqrt{2mE}$

This implies the body cannot possess kinetic energy without having momentum and vice versa .