1. What is meant by the statement 'Rest and motion are relative terms'? Give example to show
it.
2. Explain whether the walls of a classroom are at rest or in motion.
3. Define scalar and vector quantities.
111 .
Answers
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2
Explanation:
rest mean there is no ditubence in tha position of a body while motion is the vise versa of rest
2 walls of the class room are at rest
3 scalor has only magnitude while victor has magnitude and direction
Answered by
2
1.
The Earth itself is in motion (quite a considerable amount of it, in fact, on the order of hundreds of miles per hour as we rotate around the center of the galaxy) but you would never know it from intuition; we don't feel like we're moving, because we have no frame of reference.
A frame of reference is what makes motion and rest relative terms; being in motion, or being at rest, require you to compare yourself to another object. Since you can compare virtually any two things, motion and rest depend entirely on what is being compared, and whose perspective the comparison is viewed from.
We might assume that a complete absence of motion would be defined as rest; yet, this would require a universal standard of "zero motion", which does not exist. The universe itself is in motion, and thus, unless we can find some real or hypothetical nonmoving point, everything in the universe is, technically, in motion.
2.
The walls of a classroom are at rest with respect to the Earth. You are also at rest with respect to the Earth, that’s why walls do not to be moving to you, but is in motion with respect to the person moving around it.
3.
What Is A Vector Quantity?
Sometimes, to describe certain physical quantity, Direction plays a major role along with magnitude. Thus, to answer to what is Vector Quantity? is Any physical quantity that has both direction and magnitude is called vector quantity. A vector with the value of magnitude equal to one and direction is called unit vector represented by a lowercase alphabet with a “hat” circumflex. That is “û“.
What Is A Scalar Quantity?
Some physical quantities can be described just by their numerical value (with their respective units) without directions (they don’t have any direction). In general, any physical quantity with magnitude and no direction is called scalar. The addition of these physical quantities follows the simple rules of the algebra. That is only their magnitudes are added.
The Earth itself is in motion (quite a considerable amount of it, in fact, on the order of hundreds of miles per hour as we rotate around the center of the galaxy) but you would never know it from intuition; we don't feel like we're moving, because we have no frame of reference.
A frame of reference is what makes motion and rest relative terms; being in motion, or being at rest, require you to compare yourself to another object. Since you can compare virtually any two things, motion and rest depend entirely on what is being compared, and whose perspective the comparison is viewed from.
We might assume that a complete absence of motion would be defined as rest; yet, this would require a universal standard of "zero motion", which does not exist. The universe itself is in motion, and thus, unless we can find some real or hypothetical nonmoving point, everything in the universe is, technically, in motion.
2.
The walls of a classroom are at rest with respect to the Earth. You are also at rest with respect to the Earth, that’s why walls do not to be moving to you, but is in motion with respect to the person moving around it.
3.
What Is A Vector Quantity?
Sometimes, to describe certain physical quantity, Direction plays a major role along with magnitude. Thus, to answer to what is Vector Quantity? is Any physical quantity that has both direction and magnitude is called vector quantity. A vector with the value of magnitude equal to one and direction is called unit vector represented by a lowercase alphabet with a “hat” circumflex. That is “û“.
What Is A Scalar Quantity?
Some physical quantities can be described just by their numerical value (with their respective units) without directions (they don’t have any direction). In general, any physical quantity with magnitude and no direction is called scalar. The addition of these physical quantities follows the simple rules of the algebra. That is only their magnitudes are added.
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