Question

from qiestion number 1 to 8 not including 4 . if anyone knows 4 and all plz answer i will make him brainlist with more points

Answer 1

$hi...$
Ans 1
=> m / s (metre per second)

Ans 2
=>Reference point is any place or point or coordinate which you take as standard with respect to which you will standardize other phenomena relatively. Suppose you want to measure distance of a coffee shop and a cyber cafe from your house and you start measuring from your house. Then your house is the reference point. Similarly if you start measuring distance from cyber cafe to your house and to the coffee shop then cyber cafe becomes reference point.

Ans 3
=>
Motion:-A body is said be in a state of motion if it changes its position continuously with respect to its surroundings with the passage of time.
E.g A bus running on a road, a flying bird etc

Rest:- A body is said to be at rest if it does not changes its position continuously with respect to its surroundings with the passage of time.
Eg A book lying on a table.

Ans 5
=>
1)Linear motion – motion which follows a straight linear path, and whose displacement is exactly the same as its trajectory.
2)Reciprocal motion (e.g. vibration)
3)Random motion (e.g. vibration)
4)Brownian motion (i.e. the random movement of particles)
5)Circular motion (e.g. the orbits of planets)
6)Rotary motion – a motion about a fixed point. (e.g. Ferris wheel).
7)Curvilinear motion – It is defined as the motion along a curved path that may be planar or in three dimensions.
8)Rotational motion
9)Rolling motion - (as of the wheel of a bicycle)
10)Oscillation - (swinging from side to side)
11)vibratory motion
12)Combination (or simultaneous) motions - Combination of two or more above listed motions
13)Projectile motion - uniform horizontal motion + vertical accelerated motion
14)Half projectile motion
circular motion (this is a motion that move in a round of body, e.g. the moon and the earth)

Ans 6
=>Scalars are quantities that are fully described by a magnitude (or numerical value) alone.
Vectors are quantities that are fully described by both a magnitude and a direction.

Ans 7
=>In physics, acceleration is the rate of change of velocity of an object with respect to time.

Ans 8
=>Negative acceleration is called retardation .
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$hope \: \: this \: \: helps....$

Answer 2

Answer:

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=>Reference point is any place or point or coordinate which you take as standard with respect to which you will standardize other phenomena relatively. Suppose you want to measure distance of a coffee shop and a cyber cafe from your house and you start measuring from your house. Then your house is the reference point. Similarly if you start measuring distance from cyber cafe to your house and to the coffee shop then cyber cafe becomes reference point.