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Why frame of reference is required ? Exp...

Why frame of reference is required ? Explain frame of reference.

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In order to specify position, we need to use a reference point and a set of axes. It is convenient to choose a rectangular coordinate system consisting of three mutually perpendicular axes, labelled X, Y and Z-axes.
The point of intersection of these three axes is called origin (O) and serves as the reference point.
The coordinates (x, y, z) of an object describe the position of the object with respect to this coordinate system.
To measure time, we position a clock n this system.
If one or more coordinates of an object change with time, we say that the object is in motion. Otherwise, the object is said to be at rest with respect to this frame of reference.
The choice of a set of axes in a frame of reference depends upon the situation. For example, for describing motion in one dimension, we need only one axis. To describe motion in twc/three dimensions, we need a set of two/three axes.
To describe motion along a straight line, we can choose an axis, say X-axis, so that it coincides with the path of the object.

We then measure the position of the object with reference to a conveniently chosen origin sayo, as shown in figure. Position to the right of O are taken as positive and to the left of O as negative.
The position coordinates of point P and Q in figure are + 360 m and +240 m. Similarly, the position coordinate of point R is - 120 m.
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Define frame of reference and give its types.

Assertion :- To observe the motion of planets, the sun may be assumed to be an inertial frame. Reason :- For practical purpose a frame of reference may be considered as inertial if it’s acceleration is negligible w.r.t. the acceleration of the object to be observed.

Assertion: The driver in a vechicle moving with a constant speed on a straight road is in a non-inertial frame of referance. Reason: A reference frame in which Newton's laws of motion are applicable is non-inertial.

Assertion: A body,whatever its motion, is always at rest in a frame of reference which is fixed to the body itself. Reason: The relative velocity of a body with respect to itself is zero.