Physics is an interesting subject to study and Motion in a Straight line is one among the topics.
Let me share with you few interesting facts on Motion
Motion is common to everything in the universe. We walk, run and ride a bicycle. Even when we are sleeping, air moves into and out of our lungs and blood flows in arteries and veins. We see leaves falling from trees and water flowing down a dam. Automobiles and planes carry people from one place to the other. The earth rotates once every twenty-four hours and revolves round the sun once in a year. The sun itself is in motion in the Milky Way, which is again moving within its local group of galaxies.
Displacement
It is useful to define another quantity displacement as the change in position. Let x1 and x2
be the positions of an object at time t1 and t2. Then its displacement, denoted by Δx, in time Δt = (t2 - t1), is given by the difference between the final and initial positions : Δx = x2 – x1
Displacement has both magnitude and direction. Such quantities are represented by
vectors. You will read about vectors in the next chapter. Presently, we are dealing with motion
along a straight line (also called rectilinear motion) only.
lets try to explain Motion with one simple example
Question - A car is moving along a straight line, say OP in Fig. 3.1. It moves from O to P in 18 s and returns from P to Q in 6.0 s. What are the average velocity and average speed of the car in going (a) from O to P ? and (b) from O to P and back to Q ?
Answer -
This is how we understand on Motion in a straight line. Do you still need more help on Physics ?
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