The total momentum before an interaction is equal to the total momentum after, provided no resultant force acts on the system.
m1u1 + m2u2 = m1v1 + m2v2
Force
Is that which can cause acceleration.
Vector quantity. S.I. unit: newton(N)
Newtons first law
A body will remain at rest or continue at constant velocity unless acted upon by an unbalancing external force.
Newtons second law
The rate of change in momentum is proportional to the application force and takes place in the direction of the force, provided no external force acts upon the system.
Newtons third law
For every action there is an equal and opposite reaction. Action and reaction do not happen on the same body.
Newtons Law of Universal Gravitation
The force of attraction between two point masses is proportional to the product of their masses and inversely proportional to the square of the distance between them.
F= Gm1m2/ d^2
Weight
A force equal to the product of mass and acceleration due to the gravity.
Vector quantity W= mg
S.I: Newtons(N)
Derivation of newtons law of universal gravitation.
