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1. Motion
➣ motion means a continuous change in the position of a body relative to a reference point, as measured by a particular observer in a particular frame of reference.
2. Distance traveled - Distance
➣ Displacement is the change in position of an object. The SI unit for displacement is the meter. Displacement has direction as well as magnitude. Distance traveled is the total length of the path traveled between two positions.
3. Displacement
➣ Straight line distance between the initial position and final position of any body is known as displacement.
4. Scalar quantities - Scalar
➣ Scalar quantities have a size or magnitude only and need no other information to specify them. Thus, 10 cm, 50 sec, 7 litres and 3 kg are all examples of scalar quantities. Vector quantities have both a size or magnitude and a direction, called the line of action of the quantity.
5. Vector
➣ vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude. Although a vector has magnitude and direction, it does not have position.
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