Question

state the law of motion which gives the method to measure force

Answer 1

momentum of a body is proportional to the impulse impressed on the body, and happens along the straight line on which that impulse is impressed.

The second law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.

MATHEMATICAL FORMULATION OF SECOND LAW OF MOTION

Suppose an object of mass, m is moving along a straight line with an initial velocity, u. It is uniformly accelerated to velocity, v in time, t by the application of a constant force, F throughout the time, t. The initial and final momentum of the object will be,

p1 = mu and p2 = mv respectively.