True\False
1.A physical quantity which has direction as well as magnitude is known as vector,
- Displacement has both magnitude and direction.
- The sum of three vectors, having unequal magnitude, can be equal to zero.
4.If P ⃗ + Q ⃗=0, P ⃗and Q ⃗ have the same magnitude. - Vector R ⃗ and –R ⃗ have the same directions.
6.All basic quantities are scalar. - A vector quantity has no direction.
- A weight vector and a displacement vector can be added.
(1) Newton’s first law gives the idea of ……… .
(2) By Newton’s second law , the acceleration is directly proportional to ……… .
(3) Newton’s third law express the idea of ………. .
(4) Action force and reaction force cannot ……… out each other.
(5) Force has both magnitude and ……. .
(6) Force is a ……… quantity.
(7) The SI unit for force is ……….. .
(8) Mass is a measure of ………. .
(9) The attracting force of the earth acting on a body is defined as