Module 1 Flashcards
parallelogram law of forces
if 2 forces acting simultaneously at a point are represented in mag and dirn by the adjacent sides of a parallelogram then the diagonal of the parallelogram passing through the point of intersection represents the resultant of the 2 forces in both mag and dirn
principle of transmissibility
condn of eqm or of motion of a rigid body will remain unchanged
newton’s first law
every body continues to remain in its state of rest or uniform motion in a straight line, unless it is acted upon by some external force
newton’s second law
the acc of a particcle is proportional to the res F acting on it and is in the dirn of F
newton’s third law
to every action there is an equal and opposite reaction
newton’s law of gravitation
2 particles are attracted to each other along the line conn them with a F proportional to the prod of their masses and inversely prop to the square of the distance between them
basic principles of statistics
newton's first law parallelogram law of forces principle of transmissibility of F eqm law principle of superposition law of action and reaction
equilibrium
the condition in which the resultant of all the forces and moments acting on the body is 0
principle of superposition
if a number of forces simultaneously act on a body then each one of the forces will produce the same effect, when this F acts alone in the body
composition of Fs
replacement of several Fs by a single F
resolution of Fs
replacement of single F by several Fs
equilibriant
F eq in mag and opp in dirn of the resultant
theorem of resolved parts
projection of the resultant of 2 Fs on any axis is equal to the algebraic sum of the projections of 2 Fs along the same axis
space diagram
sketch showing the physical situation of a system consisting of several bodies
free body diagram
the sketch in which the body is completely isolated from its supports and in which all the forces acting on it are shown
