Define the following terms:
1.motion
2.rest
3.scalar quantity
4. vector quantity
5.physical quantity
Answers
Answer:
1)Motion-In physics , motion is a change in position of an object over time. Motion is described in terms of displacement , distance, velocity, acceleration, time and speed. Motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame.
2)Rest-An object is said to be at rest if it does not change its position with respect to its surroundings with time.
3)Scalar quantity-Scalar quantities are quantities that are described only by a magnitude. They do not have a direction of action. For fluids the relevant scalar quantities are • temperature T , measured in K.
4) Vector quantity-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.
5)Physical quantity-A quantity that can be measured in terms of other quantities is called a physical quantity. A standard unit is an exact quantity that is used to compare measurements. A standard unit that is universally acceptable is called an S.I unit.
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Answer:
1. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.
2. rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time
3. Scalar Quantities: The physical quantities which are specified with the magnitude or size alone are scalar quantities. For example, length, speed, work, mass, density, etc.
4. Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction. For example, displacement, force, torque, momentum, acceleration, velocity, etc.
5.physical quantity: A physical quantity is a property of a material or system that can be quantified by measurement. ... For example, the physical quantity mass can be quantified as n kg, where n is the numerical value and kg is the unit.
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