Motion

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Motion is the state where an object's position changes with time with respect to a fixed point in its surroundings. It is the opposite of rest.

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Rest is the state where a body does not change its position with respect to a fixed point in its surroundings.

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Rest and motion depend on the observer and the surroundings. The same body can be at rest for one observer and in motion for another. For example, a passenger inside a moving bus may see the driver at…

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This is translatory motion. In translatory motion, every point of the object moves through the same distance in the same time.

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Rectilinear motion is translatory motion along a straight line. Example: a ball falling from a height straight downward.

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This is curvilinear motion. Curvilinear motion is translatory motion along a curved path.

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Rotatory motion is the motion of a body about a fixed axis passing through the body itself. Different parts of the body move through different distances in the same time.

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This is circular motion. Circular motion is motion along a circular path, where the distance from the fixed centre remains constant.