Vector Board - Gravesand's Apparatus Viva
Q.1 What is the object of your experiment ?
Ans: Determination of the resultant of two given vectors (forces) by the parallelogram law of forces.
Q.2 What is a scalar Quantity ?
Ans: A physical quantity that has only magnitude but no direction is called scalar quantity.
Q.3 What is vector quantity ?
Ans: A physical quantity that has both magnitude and direction is called vector quantity.
Q.4 Give some examples of scalar quantities ?
Ans: Speed, distance, mass, volume, density, work, time, temperature, energy, charge, entropy, frequency, and any real number are some examples of scalar quantities.
Q.5 Give some examples of vector quantities.
Ans: Displacement, velocity, weight, force, acceleration, momentum, torque, magnetic field intensity, and electric field intensity are some examples of vector quantities.
Q.6 What do you mean by a unit vector ?
Ans: Unit vector is that vector whose magnitude is unity and it simply indicates the direction.
Q.7 What do you mean by a null vector or zero vector ?
Ans: It is a vector having zero magnitude and can have any arbitrary direction.
Q.8 What do you mean by resultant vector ?
Ans: When two or more vectors are added, we get a single vector which produces the same effect as the combined effect of all the vectors to be added. The single vector is known as the resultant vector.
Q.9 Define resolution of vector ?
Ans: The splitting up of a single vector into two or more vectors is called resolution of vector.
Q.10 What do you mean by components of a vector?
Ans: Any number of vectors making a resultant vector are called the component of that resultant vector.
Q.11 What are rectangular components?
Ans: If the two components of a vector are at right angle to each other, they are called the rectangular components of that vector.
Q.12 Define parallelogram law of vector addition.
Ans: If two vectors are represented in magnitude and direction by the two adjacent sides of a parallelogram, then the diagonal of the parallelogram, from the tails of two vectors, gives their resultant.
Q.13 What do you mean by the term force?
Ans: Force is that agent which produces or tends to produce, stop or tends to stop the motion of a body.
Q.14 What is the unit of force?
Ans: The force is measured in Newton (MKS system) or in dyne (CGS system) or in pound (BE system).
Q.15 Define Pythagoras Theorem.
Ans: It states that for a right angled triangle
(hypotenuse)2 = (base)2 + (perpendicular)2
Q.16 States head to tail rule or graphical method of addition of vectors.
Ans: The vectors are added graphically by head to tail rule which states that when the representative lines of all the given vectors are drawn, arrange them in such a way, that head of first vector line joins with tail of second one, head of second vector joins with the tail of third one and so on. Then the line joining the tail of first vector with the head of last one will represent the resultant vector.
Q.17 What is law of parallelogram of forces ?
Ans: If two forces, acting simultaneously at a point on a body, be represented in magnitude and direction by the two adjacent sides of a parallelogram, then the diagonal of the parallelogram gives the resultant of the two forces in magnitude and direction.