INTRODUCTION/ DEFINITIONS:
The instrument found in automobiles to show distance travelled is called an odometer.
The shortest path measured from the initial to the final position is termed as displacement.
Speed is the distance travelled by an object in unit time.
Average speed is got by dividing the total distance travelled by the total time taken.
Uniform motion is the motion where an object covers equal distances in equal intervals of time.
Non-uniform motion is the motion where objects cover unequal distance in equal intervals of time.
Speed of an object moving in a definite direction is called as its velocity.
Acceleration is the change in the velocity of an object per unit time.
When a body completes one rotation in a circular path its initial and final positions are the same and hence its displacement is zero.
The speedometer of a vehicle measures its instantaneous speed.
When an object is moving in a circular path with a constant speed, the motion of an object is said to be uniform circular motion.
Magnitude of the displacement of a body is measured by the area under the velocity-time graph.
When an object is thrown vertically upward, its velocity at the highest point is zero but it has constant acceleration = 9.8 m s-2
A body has uniform acceleration if its velocity changes by an equal amount in equal intervals of time. .