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Distance | Displacement |
Distance is defined as the total length of the path traveled by an object to go from one point to another. | Displacement is defined as the length of the straight path that joins the initial and final positions of an object. |
Since distance has only magnitude and its direction cannot be specified always, it is a scalar quantity. | Since displacement has magnitude and it is specified in a direction from initial position to final position, it is a vector quantity. |
Distance can only have positive values. | Displacement can have both positive and negative values. |
Distance depends on the length of the path travelled. | Displacement depends only on the initial and final point regardless of the path travelled. |
SPEED | VELOCITY |
It is defined as the rate of change of distance. | It is defined as the rate of change of net displacement. |
It is a scalar quantity. | It is a vector quantity. |
It can never be negative or zero. | It can be negative,zero or positive. |
Speed is velocity without direction. | Velocity is directed speed. |
Speed may or may not be equal to velocity. | A body may possess different velocities but the same speed. |
Speed never decreases with time. For a moving body, | Velocity can decrease with time. For a moving body , it can be zero. |
Speed is never zero. | Velocity can be zero. |
Speed in SI is measured in ms-1 | Velocity in SI, is measured in ms-1 |
Conclusions From a Distance – Time Graph
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