Momentum of a system remains conserved . Therefore , o
Greater force is required to set heavier bodies in motion o
Greater force is required to stop bodies moving with higher velocities
Conclusion : Greater the change in momentum in a given time , greater is the force that needs to be applied . In other words , greater the change in momentum vector , greater is the force applied .
Newton ’ s Second Law o
o
The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts .
Alternatively , the relationship between an object ' s mass m , its acceleration a , and the applied force F is F = ma ; the direction of the force vector is the same as the direction of acceleration vector .