Motion In Physics Part2
Hi Friends here we come again with a new point that is related to Motion. In previous Post we have talk about Introduction of Motion where we have dealt with some points so now lets continue from there...
DESCRIBING THE POSITION OF AN OBJECT
Quite often in physics, we deal with “locations” in space. For example, to describe the motion of an object, we need to know its position at various intervals of time. Therefore, before describing the motion of an object we will tell you how to describe of an object.
How is the position of an object described.
The position of an object can be described by specifying the following two parameters:
- The distance of the object from a fixed reference point. Any point whose location is ‘known’ may be taken as the fixed reference point.
- The direction of the object. The direction of the object is described by the angle which the line joining the object and fixed reference point makes with a reference axis. The reference axis may be one of the,
- Cartesian axes e.g., x-axis, y-axis
- Geographical directions e.g., east, west, north and south
A method to describre the position of an object is illustrated below:
When the object lies on one of the Cartesian axes.
- When the object lies in between the two catresian axes.
- Some important Terms
- Particle: A particle is ideally just a piece or a quantity of matter, having practically no linear dimensions but only a position, the measure of this quantity of matter being the mass of the particle.
- Event: An event stands un our mathewmatical model for anything that occurs suddenly or instantaneously at a point in space. It thus involves both, a position and a time of occurrence.
- Observer: A person or an equipment which can locate, record, measure and interpret an event is called an observer.
Thank you(Sashi Kant)
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