Classify the following measures as scalars and vectors.
(i) 10 kg (ii) 2 meters north-west
(iii) 40° (iv) 40 watt
(v) 10-19 coulomb (vi) 20 m/s2
Scalars are defined as quantities that have magnitude only.
Vectors are defined as a quantity that has magnitude as well as direction.
(i) 10 kg: It is a measure of mass. It is a scalar quantity as it has magnitude only and no direction.
(ii) 2 meters north-west: It is a measure of distance in a particular direction. ∴ It is a vector quantity as it has magnitude as well as direction.
(iii) 40°: It is a measure of angle. It is a scalar quantity as it has magnitude only and no direction.
(iv) 40 Watt: It is a measure of power. It is a scalar quantity as it has magnitude only and no direction.
(v) 10-19 coulomb: It is a measure of electric charge. It is a scalar quantity as it has magnitude only and no direction.
(vi) 20 m/sec2: It is a measure of acceleration. It is a vector quantity as it is a measure of rate of change of velocity.