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STUDY OF MALARIA

2.1 REST AND MOTION
We see various things around us. Some of them are at rest while others are in motion.
A body is said to be at rest, if it does not change its position with respect to its surroundings.
Surroundings are the places in its neighbourhood where various objects are present. Similarly,
A body is said to be in motion, if it changes its position with respect to its surroundings.
The state of rest or motion of a body is relative. For example, a passenger sitting in a moving bus is at rest because he/she is not changing his/her position with respect to other passengers or objects in the bus. But to an observer outside the bus, the passengers and the objects inside the bus are in motion.
2.2 TYPES OF MOTION
If we observe carefully, we will find that everything in the universe is in motion. However, different objects move differently. Some objects move along a straight line, some move in a curved path, and some move in some other way. There are three types of motion.
(i) Translatory motion (linear, random and circular)
(ii) Rotatory motion
(iii) Vibratory motion (to and fro motion)
TRANSLATORY MOTION
Watch how various objects are moving. Do they move along a straight line? Do they move along a circle? A car moving in a straight line has translational motion. Similarly, an aeroplane moving straight is in translational motion.
In translational motion, a body moves along a line without any rotation. The line may be straight or curved.

DISTANCE AND DISPLACEMENT
Figure 2.17 shows a curved path. Let S be the length of the curved path between two points A and B on it. Then S is the distance between points A and B.
Length of a path between two points is called the distance between those points.
Consider a body that moves from point A to point B along the curved path. Join points A and B by a straight line. The straight line AB gives the distance which is the shortest between A and B. This shortest distance has magnitude d and direction from point A to B. This shortest distance d in a particular direction is called displacement. It is a vector quantity and is represented by d.
Displacement is the shortest distance between two points which has magnitude and direction.

Second Equation of Motion. Students of Matric(Senior) be ready for presentation on First and Second Equation of Motion tomorrow.

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