Momentum School

What is momentum?

product of velocity and mass

P=mass*velocity

Units of momentum?

Kgms-1 OR Ns

Momentum is vector or scaler?

VECTOR

Knowledge of momentum is applied during?

Collisions and explosions

Principal of momentum?

TOTAL momentum before a collision is equal to TOTAL momentum after the collision provided that no external resultant forces act on the system/closed system

Relationship between force and momentum?

F=ma

F=m*(v-u/t) Since a=v-u/t

F=mv-mu/t

Force is equal to rate of change in momentum

F=change in P/change in time

What is impulse?

Impulse is force into time

I=F*t

Impulse is equal to change in momentum

F*t=mv-mu

Two types of collision

Elastic collision and inelastic collision (both SCALERS)

Elastic collision

K.E is conserved

K.E before collision=K.E after the collision

Inelastic collision

K.E is not conserved but it is converted to other forms of energy e.g heat energy ect…

Therefore total energy remains constant

K.E and momentum equation

Ek=p2/2m