1:- What is motion?
Ans:- An object is said to be in motion if its position changes continuously with respect to a fixed observer or refrence point.
Ex:- A car moving on a road
2:- What is rest?
Ans:- Rest is the state at which an object is stationary or not moving with respect to its surroundings.
This happens in two cases
👉The objects are at rest in the given plane.
👉The objects are moving in the same direction at same pace.
Ex:- book lying on a table
3:- What is Distance?
Ans:-The actual lenght of path covered by a body during the course of its motion from initial position to final position is known as distance.
Distance is a scalar quantity.
The SI unit of distance is meter. (m )
The large unit of distance is kilo metre. (km)
4:- What is Displacemnt?
Ans:- The shortest distance between the initial position and the final position of a body is called displacement.
Displacement is a vector quantity because it has fixed magnitude and direction.
The SI unit of displacement is meter ( m )
5:- What is physical quantity?
Ans:- Any thing which can be quantitatively defined and measured, is known as physical quantity. A physical quantity has three components.
1:- Numerical components
2:- Unit
3:- Direction
6:- what is vector quantity?
Ans:- A vector quantity is defined as the physical quantity that has both magnitude as well as direction.
Ex:- force, weight, displacement, velocity etc.
7:- What is scalar quantity?
Ans:- A physical quantity which have magnitude but does not have fixed direction is called a scalar quantity.
Ex:- Time, mass, lenght, speed, energy, temperature, area, volume, density, pressure, work, power etc.
8:- Writes two differences between vector quantity and scalar quantity.
Ans:-
👉 Vector quantity are represented by both magnitude and direction but scalar quantities are represented by magnitude only.
👉Vector quantities can not be added or subtracted accordig to rules of arithmetic but scalar quantities can be added / subtracted according to rules of arithmetic.
9:- Write an example where distance is non zero but displacement is zero.
Ans:- When an athlete takes a round of a circular field of radius r, than the distance covered by him is equal to the circumference of field but the displacement is zero because he comes back to his initial position.
10:- Write an example where distance and displacement are equal.
Ans:- When a car moves along a straight highway. in this case the initial position and finial position are same in both distance and displacement. therefore distance and displacement are equal in magnitude.
11:-
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