Question

describe the chapter with full explanation and pictures
don't copy it from net

the chapter "motion" of class IX ???

urgent need
I will surly mark as brainliest answer

Answer 1

these notes can help you it also helps me

• An object is said to be in motion when its position changes with time.
• We describe the location of an object by specifying a reference point. Motion is relative. The total path covered by an object is said to be the distance travelled by it.
• The shortest path/distance measured from the initial to the final position of an object is known as the displacement.
• Uniform motion: When an object covers equal distances in equal intervals of time, it is said to be in uniform motion.
• Non-uniform motion: Motions where objects cover unequal distances in equal intervals of time.
• Speed: The distance travelled by an object in unit time is referred to as speed. Its unit is m/s.
• Average speed: For non-uniform motion, the average speed of an object is obtained by dividing the total distance travelled by an object by the total time taken.

• Velocity: Velocity is the speed of an object moving in definite direction. S.I. unit is m/s.

• Acceleration: Change in the velocity of an object per unit time.

Graphical representation of motions
(i) Distance-time graph
For a distance-time graph time is taken on x-axis and distance is taken on y- axis.
[Note: All independent quantities are taken along the x-axis and dependent quantities are taken along y-axis.]


• Uniform circular motion: When a body moves in a circular path with uniform speed, its . motion is called uniform circular motion.