Question
Define
1. Scalar quantities.
2. Vector quantities. Give two differences between scalar and vector quantities.
1. Scalar quantities.
2. Vector quantities. Give two differences between scalar and vector quantities.
✓
Answer
(i) Scalar quantities: The physical quantities which are expressed in magnitude only are called scalar quantities.
For example: Mass, length, time, distance, density, energy etc.
(ii) Vector quantities: The physical quantities which are 'expressed in magnitude as well as direction are called vector quantities.
For example: Displacement, velocity, acceleration, momentum, force etc. Differences between scalar and vector quantities.
SCALARS:
1. Scalars are specified by one quantity only i.e. magnitude.
2. Scalars change by change in magnitude along.
3. Scalars are written or represented by ordinary letters.
4. Scalars are added by just algebraic addition or subtraction.
5. Mass, length, time, speed, etc. are some example of scalars.
VECTORS:
1. Vectors are specified by two quantities (i) magnitude and (ii) direction.
2. Vectors change when there is change in either magnitude or direction or both.
3. Vectors are written (shown) in bold face letters or letters having arrows heads on them.
4. Vectors are added or subtracted by using triangle law, parallelogram law or polygon law.
5. Displacement, velocity acceleration are some examples of vectors.
For example: Mass, length, time, distance, density, energy etc.
(ii) Vector quantities: The physical quantities which are 'expressed in magnitude as well as direction are called vector quantities.
For example: Displacement, velocity, acceleration, momentum, force etc. Differences between scalar and vector quantities.
SCALARS:
1. Scalars are specified by one quantity only i.e. magnitude.
2. Scalars change by change in magnitude along.
3. Scalars are written or represented by ordinary letters.
4. Scalars are added by just algebraic addition or subtraction.
5. Mass, length, time, speed, etc. are some example of scalars.
VECTORS:
1. Vectors are specified by two quantities (i) magnitude and (ii) direction.
2. Vectors change when there is change in either magnitude or direction or both.
3. Vectors are written (shown) in bold face letters or letters having arrows heads on them.
4. Vectors are added or subtracted by using triangle law, parallelogram law or polygon law.
5. Displacement, velocity acceleration are some examples of vectors.
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