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Motion
Motion- An object is said to be in motion if it changes its position with respect to a stationary reference point or origin.
Rest- An object is said to be at rest if it does not changes its position with respect to a stationary reference point or origin.
An object can be in the state of both rest and motion with respect to different reference points.
Motion and rest are related term which implies that they are dependent upon the reference points to be described completely.
Physical Quantity- quantities which can be measure with a device and have a unit are physical quantities.
Scalar Quantities- Quantities that can be specified by describing their magnitude only. Example : Length ,Mass, Volume ,Distance.
Vector Quantity- Quantities which require magnitude and direction both to be described completely are called vector quantity. Example: Weight, Displacement, Force, Velocity
Distance- It is the actual length of the park from initial to final position
Displacement - It is the shortest distance between the initial and the final point
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Distance
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Displacement
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It is the actual length of the park from initial to final position
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It is the shortest distance between the initial and the final point
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It depends on the path followed
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There is only one shortest distance
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It is a scalar quantity
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It is a vector quantity
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Distance can never be zero
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It can be zero.
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Differences between Distance and Displacement
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Uniform and non-uniform motion
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Uniform motion – An object is said to be in uniform motion when it covers equal distances in equal intervals of time. When an object is in uniform motion it moves with uniform speed. The Distance /Time graph of an object moving in uniform motion is a straight line.
Non-uniform motion- An object is said to be in non-uniform if it covers equal distance in unequal interval of time or vice versa or both. An object is in non-uniform motion has variable speed. . The Distance /Time graph is a curved line.
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