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Distinguish between speed and velocity?
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Speed |
Velocity |
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Speed is the distance travelled by an object in a given interval of time. It does not have any direction. |
Velocity is the displacement of an object in a given interval of time. It has a unique direction. |
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Speed is given by the relation:
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Velocity is given by the relation:
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The speed of an object can never be negative. At the most, it can become zero. This is because distance travelled can never be negative. |
The velocity of an object can be negative, positive, or equal to zero. This is because displacement can take any of these three values. |
Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
When an object moves in a straight-line path, then the magnitude of distance covered and displacement become same, and average velocity and average speed will be equal.
What does the odometer of an automobile measure?
It measures the distance covered by the vehicle.
What does the path of an object look like when it is in uniform motion?
Uniform motion refers to speed of an object. So if the object continues to move in a fixed direction, the path will look like the straight line.
During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 108 m s−1?
Time taken by the signal to reach the ground station from the spaceship
= 5 min = 5 × 60 = 300 s
Speed of the signal = 3 × 108 m/s
∴Distance travelled = Speed × Time taken = 3 × 108 × 300 = 9 × 1010 m
Hence, the distance of the spaceship from the ground station is 9 × 1010 m.
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