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. If the sum of the vectors is zero, the two vectors have same magnitude and ………
directions.
11.Quantities that have only ………. are called scalars.

1. A ……… has both magnitude and direction.
2. The change in position along a certain direction is called ……… .
3. Force is a ……… quantity.
4. Mass is a …….. quantity.
5. The combined effect of two (or) more vectors is called …….. .
6. The vector sum of two vectors is called ……… vector.
   18.The process of sub-dividing into two or more vectors is called ……… .
7. A vector can be represented by an ………. .
8. Vectors of ………. kinds may not be added.
9. Only vector quantities of ………. kind may be added.
10. If D ⃗ =-4C ⃗, the magnitude of D ⃗ is ………. than that of C ⃗.
11. If A ⃗, B ⃗ and C ⃗ satisfy the equation A ⃗+B ⃗-C ⃗=0, then C ⃗ is ……… vector of A ⃗and B ⃗.
12. The magnitude of the resultant force of a 12 N pointing east and a force of 5 N

1. The nuclear force is a ……. range force.
   (20) The ratio of mass to volume is defined as ……… .
   (21) The density of ice is ……….. than that of water.
   (22) The symbol of density is ρ and it is a …….. quantity.
   (23) The SI unit for pressure is …….. .
   (24) The total momentum of an …….. system is constant.