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Combination of Scalar (Part - 2) - Motion in a Plane, Physics Video Lecture - Class 11

FAQs on Combination of Scalar (Part - 2) - Motion in a Plane, Physics Video Lecture - Class 11

1. What is scalar quantity and how is it different from vector quantity?
Ans. Scalar quantities are physical quantities that have only magnitude and no direction. Examples of scalar quantities include mass, temperature, and time. On the other hand, vector quantities have both magnitude and direction. Examples of vector quantities include displacement, velocity, and force.
2. How can we represent scalar quantities mathematically?
Ans. Scalar quantities can be represented mathematically using real numbers. They can be added, subtracted, multiplied, and divided using the usual rules of arithmetic. For example, if we have two scalar quantities A and B, their sum would be represented as A + B.
3. Give an example of a scalar quantity in motion in a plane.
Ans. Speed is an example of a scalar quantity in motion in a plane. Speed only indicates the magnitude of the motion without considering the direction. For example, if a car is moving at a speed of 60 km/h, it does not tell us in which direction it is moving.
4. Can a scalar quantity be negative?
Ans. Yes, a scalar quantity can be negative. Negative sign represents the opposite direction or the opposite sense of the quantity. For example, if we consider temperature as a scalar quantity, a negative temperature value indicates that the temperature is below zero.
5. How can we combine scalar quantities to obtain a resultant scalar quantity?
Ans. Scalar quantities can be combined algebraically to obtain a resultant scalar quantity. If we have two scalar quantities A and B, their sum or difference would result in a scalar quantity. For example, if we add two scalar quantities A and B, the resultant scalar quantity would be A + B.
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