Isaac Newton - first law -an object moves at a c___ velocity if there is no n___ force acting upon it. Second law - the acceleration of an object is directly p____ to the n__ force, acting upon it and in the d___ the f___ is applied. Third law - an opposite f___ is needed. For every action f___, there is an equal and o___ reaction force
a) constant, neutral, proportional, net, direction, force, force, force
b) circular, natural, perpendicular, net, distance, flow, flow, flow
c) consistent, nuclear, proportionate, newtonian, duration, flux, flux, flux
d) continuous, negligible, perpendicular, negative, drop, flux, flow, flow