The Concurrent Forces Viva Questions and Answers
The Concurrent Forces Viva Questions and Answers
(i) State parallelogram law of forces
Ans: If two forces acting at a point be represented in
magnitude and direction by the adjacent sides of a parallelogram drawn from a
point, the resultant force is represented in magnitude and direction by the
diagonal of the parallelogram drawn from the same point
(ii) State triangle of forces
Ans: If three forces acting at a point can be represented in
magnitude and direction by the sides of a triangle taken in order then the
forces is in equilibrium,
(iii) What is meant by resultant of a set of force?
Ans: It is that single force which effectively replaces the
set of forces
(iv) What are concurrent forces?
Ans: Forces acting at a point are known as concurrent
forces.
(v) What is Lami's theorem?
Ans: If three forces acting at a point keep it in
equilibrium, then each force is proportional to the since of the angle between
the other two.
(vi)
What is the angle between them
Ans: 45°
vii) Will the forces 15N, 20N and 40N acting at a point keep
it in equilibrium?
Ans: No
viii) What are the main sources of error in the experiment?
Ans: (a) Friction at the pulleys. (b) Thread cannot be
weight less.
(ix) If there is a lot of friction at the pulleys in what
way the result of this experiment be affected?
Ans: The forces represented by the hanging weight will have
values lower than what are given by the relation W = mg
(x) Apparatus of Concurrent Forces
Ans: Parallelogram law apparatus consisting of two
frictionless pulleys attached to a framework fixed on the top of a vertical
drawing board, light inextensible strings, weights and weight hangers and the
given body.
(xi) Theory of Concurrent Forces
Ans: If three co-planer concurrent forces P, Q and R keep a
point in equilibrium, the resultant of P and Q will be equal and opposite to R,
the equilibrant.
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