Three laws of motion and also define unit force using second law
Answers
Newton’s first law :- Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
this is often called the "Law of Inertia".
Newton's second law :-The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
.It is the second law which relates the force or more precisely the unbalanced force acting on the body to its acceleration (which is simply the change in velocity with respect to time) and as we know the relation is simply F=ma
[F]=[m][a]
the dimension of mass is M and that of acceleration is L/T^2.
[F]=(M*L)/T^2
the unit in SI convention, just put M=1kg,L=1m and T=1s.
So, unit of force =1 Kg.m/s^2 or 1 Newton of force.
Newton's third law :-
For every action, there is an equal and opposite reaction.The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.