Motion in one, two and three dimensions

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Coordinate axes or frames

To study the motion of an object, it is necessary to specify its position with respect to its surrounding with time.

In Mechanics, we use three mutually perpendicular lines or axes to specify the position of an object in space called coordinate axes or coordinate frames.

Consider there is a point  in the space, then these coordinates are used to find the distance of the point with respect to a fixed point. The position of the point is described in terms of distances from these three coordinate axes, called coordinates of the point.

The coordinates of the point P are (x, y, z ), where x is the distance of point P from X axis, y is the distance of point P from Y axis and z is distance of point P from Z axis.

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One-dimensional motion

The motion of an object, which requires only one coordinate axis out of three to specify its position that changes with time, is known as one-dimensional motion.

Ex.- In this type of motion of a body moves in a straight like, as a train moves in a straight railway track, and an object falling freely to the ground  under the effect of gravity, etc.

Two-dimensional motion

A motion, in which two coordinate axes are required to specify the position of an object in space changes with respect to time, is known as two-dimensional motion.

Ex.- In these motions, the object moves in a plane. For example, movement of players at the playground, an insect crawling over the floor of a room, motion of Earth around the Sun, etc.

Three-dimensional motion

A motion, in which all three coordinate axes are required to specify the position of an object in space changes with respect to time, is known as three-dimensional motion.

Ex.- Motion of a kite flying in the sky, a flying bird, motion of the gas molecules, etc.

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Physics Class 9 & 11 ( based on new revised syllabus )

1. Physical world

• Physical world, part -1
• Scope and excitement of Physics, part -2
• Nature of physical laws, part - 3

2. Units and Measurements

• Units and Measurements, part-1
• Length, mass and time Measurements
• Estimation or Calculation of errors
• Significant Figures and its Rules
• Dimensional Analysis

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