Class 11 Important Questions for Physics: Scalars and Vectors

Page 1

INFOMATICA ACADEMY

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Scalars and Vectors ❖ Illustrative Examples 1) The vectors

and

have magnitude 3 units and 4 units respectively.

resultant of

and

. Find the magnitude and direction of

between

and

is the

when the angle

is 30o.

Data : P = 3 unit, Q = 4 unit,

= 30o

(Ans.

)

2) Two points A and B in space have the co-ordinates (2,-l,3) and (4,2,5) respectively. Find vector AB.

(Ans.

)] 3) What vector added to

and

will give a unit vector along negative y

– axis?

(Ans.

4) Find m if 5) If

and and

is the required vector.]

have the same directions. Find the angle between

(Ans.

and (Ans.

6) The angular momentum momentum

is a vector product of position vector

If

and

L.

and

)

and linear

(Ans.

7) Find the area o1'the parallelogram with adjacent sides formed by where

)

expressed in meter.

) and

.

(Ans.

)

❖ Theory Questions 1)

Define scalars and vectors. Give two examples of each.

2)

What is equal vector and null vector?

3)

What is triangle law of vector addition?

4)

What is law of polygon of vectors?

5)

State and prove parallelogram law of vector addition and determine magnitude and direction of resultant vector.

F.Y.J.C.

Scalars and Vectors


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